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Kalkura, K. N., Singh, A., Ramesh Chand K. A., Devaprasad, M., Pandithurai, G., Salim, R., Carbone, S., Allan, J., McFiggans, G., Liu, P., Coe, H., Raghunathan, R., & Gunthe, S. S. (2026). Aerosol interplay with meteorology in a biodiversity-rich high-altitude site in India: impacts of southwest monsoon on aerosol chemical characteristics. Scientific Reports. https://doi.org/10.1038/s41598-026-57287-7

Suri, S., Yin, L., Bai, B., Yang, Y., Wang, D., Metcalf, A. R., Chellman, N., Swarthout, R. F., Sherman, J., and Liu, P.* (2026). Assessing Black Carbon and Iron Oxide Aerosols: A Comparative Study between Urban and Rural Environments in the Southeastern U.S. ACS ES&T Air, 3(6), 1485–1496. https://doi.org/10.1021/acsestair.5c00400

Yin, L., Zheng, Y., Bai, B., Zhang, B., Silvern, R. F., Mao, J., Mickley, L. J., and Liu, P.* (2026). Processes driving the regional sensitivities of summertime PM_2.5 to temperature across the US: new insights from model simulations. Atmospheric Chemistry and Physics, 26, 5901–5923. https://doi.org/10.5194/acp-26-5901-2026

Patel, A., Reddy, M. C., Zhang, B., Swain, B., Pandithurai, G., Andreae, M. O., Martin, S. T., Liu, P., & Gunthe, S. S. (2026). Linking anthropogenic chlorine emissions to regional air quality in India. npj Clean Air, 2(1), 23. https://doi.org/10.1038/s44407-026-00066-5

Zhang, B., Yin, L., Yang, Y., Guo, H., Xu, L., Di, Q., Wei, Y., Wei, J., Pan, D., Schwartz, J., Ng, N. L., Weber, R. J., & Liu, P.* (2026). High-resolution aerosol liquid water content in the contiguous United States using machine learning. npj Climate and Atmospheric Science, 9(1), 161. https://doi.org/10.1038/s41612-026-01371-2

Bai, B., Vandergrift, G. W., Liang, Y., Li, Y., Cheng, Z., Wang, Y., Shin, N., Keutsch, F., Lambe, A., China, S., Ng, N. L., & Liu, P.* (2026). Dynamic Evolution of Mass and Physical Properties of Atmospheric Organic Aerosol Under Solar Irradiance. Environmental Science & Technology, 60(8), 6464–6476. https://doi.org/10.1021/acs.est.5c16671

Bai, B., Singh, A., Xu, T., Stamatis, C., Lu, K., Shin, N., Glenn, C. K., El Hajj, O., Kumar, K. V., Anosike, A., Abdurrahman, M. I., Gunthe, S. S., O’Brien, J. J., Isaacman-VanWertz, G., Saleh, R., Ng, N. L., & Liu, P.* (2026). Hygroscopicity and Cloud Condensation Nuclei Activity of Fresh and Aged Biomass Burning Particles. ACS ES&T Air, 3(3), 697–709. https://doi.org/10.1021/acsestair.5c00331

Moo, Z., DeMarsh, K., Hao, P., Wang, Y., Zhang, X., Liu, P.*, Mao, X., & Zhang, X. (2025). Incense and Candle Burning: A Major Source of Phthalate Exposure in Indoor Environments. Indoor Air, 2025, 5518324. https://doi.org/10.1155/ina/5518324

Zhai, J., Zhang, Y., Liu, P., Zhang, Y., Zhang, A., Zeng, Y., Cai, B., Zhang, J., Xing, C., Yang, H., Wang, X., Ye, J., Wang, C., Fu, T.-M., Zhu, L., Shen, H., Tao, S., & Yang, X. (2025). Source-dependent optical properties and molecular characteristics of atmospheric brown carbon. Atmospheric Chemistry and Physics, 25, 7959–7972. https://doi.org/10.5194/acp-25-7959-2025

Panda, U., Dey, S., Sharma, A., Singh, A., Reyes-Villegas, E., Darbyshire, E., Carbone, S., Das, T., Allan, J., McFiggans, G., Ravikrishna, R., Coe, H., Liu, P., & Gunthe, S. S. (2025). Exploring the chemical composition and processes of submicron aerosols in Delhi using aerosol chemical speciation monitor driven factor analysis. Scientific Reports, 15, 14383. https://doi.org/10.1038/s41598-025-99245-9

Li, Z., Lawal, A. S., Zhang, B., Maji, K. J., Liu, P., Hu, Y., Russell, A. G., & Odman, M. T. (2025). A Generalized User-friendly Method for Fusing Observational Data and Chemical Transport Model (Gen-Friberg V1.0: GF-1). Environmental Modelling & Software, 197, 106827.

Kotha, S.V., Kuo, G., Kammula, S.V., Shi, L., Zhang, X.*, Liu, P.*, & Mao, X. The Epidemiological and Toxicological Intersection of Air Pollution and Dementia. Reviews Env. Contamination 263, 25 (2025). https://doi.org/10.1007/s44169-025-00092-6

He, Y., Kadko, D. C., Stephens, M. P., Sheridan, M. T., Buck, C. S., Marsay, C. M., Landing, W. M., Zheng, M., & Liu, P. (2025). Constraining aerosol deposition over the global ocean. Nature Geoscience, 18, 966–974. https://doi.org/10.1038/s41561-025-01785-2

Noël, A., Glenn, C. K., El Hajj, O., Anosike, A., Kumar, K., Abdurrahman, M. I., Flanagan, S., Callaham, M. A., Loudermilk, E. L., Roberts, E. T., Choi, J. H., Bai, B., Liu, P., Amster, I. J., O’Brien, J. J., & Saleh, R. (2025). Differential In Vitro Lung Cell Toxicity of Fresh and Photochemically Aged Smoke Aerosol Emissions from Simulated Wildland Fires of Duff and Surface Fuels. ACS ES&T Air, 2(10), 2251–2262. https://doi.org/10.1021/acsestair.5c00207

Mourgela, R.-N., Roșu, I.-A., Boleti, E., Petrakis, M. P., Seiradakis, K., Gkouvousis, A., Le Sager, P., Wyser, K., Zhang, B., Liu, P., & Voulgarakis, A. (2025). Studying the Pre-Industrial to Present-Day Effective Radiative Forcing from Wildfire Emissions Using EC-Earth. Environmental and Earth Sciences Proceedings, 35(1), 23. https://doi.org/10.3390/eesp2025035023

Zhang, X., Liu, H., Wu, X., Jia, L., Gadhave, K., Wang, L., Zhang, K., Li, H., Chen, R., Kumbhar, R., Wang, N., Terrillion, C. E., Kang, B. G., Bai, B., Park, M., Denna, M. C. F., Zhang, S., Zheng, W., Ye, D., Rong, X., Yang, L., Niu, L., Ko, H. S., Peng, W., Jin, L., Ying, M., Rosenthal, L. S., Nauen, D. W., Pantelyat, A., Kaur, M., Irene, K., Shi, L., Feleke, R., García-Ruiz, S., Ryten, M., Dawson, V. L., Dominici, F., Weber, R. J., Zhang, X., Liu, P., Dawson, T. M., Han, S., & Mao, X. (2025). Lewy body dementia promotion by air pollutants. Science, 389(6764), eadu4132. https://doi.org/10.1126/science.adu4132 [Georgia Tech CoS News]

Singh, A., Swain, B., Sebastian, M., Tripathi, S. N., Pöhlker, M., Allan, J., McFiggans, G., Pöschl, U., Su, H., Martin, S. T., Andreae, M. O., Ravikrishna, R., Cheng, Y., Coe, H., Liu, P.*, & Gunthe, S. S.* (2025). Anthropogenic Emissions in Coastal India Strongly Influence New Particle Formation and Cloud Condensation Nuclei Activity. ACS ES&T Air. https://doi.org/10.1021/acsestair.5c00180

Shin, N., Bai, B., Joo, T., Wang, Y., Ng, N. L.*, & Liu, P.* (2025). Photolytic Mass Loss of Secondary Organic Aerosol Derived from Photooxidation of Biomass Burning Furan Precursors. ACS ES&T Air. https://doi.org/10.1021/acsestair.4c00230

Lambe, A. T., Glenn, C. K., Avery, A. M., Xu, T., Ditto, J. C., Canagaratna, M. R., Gentner, D. R., Docherty, K. S., Jaoui, M., Zaks, J., Bertram, A. K., Ng, N. L., & Liu, P. (2025). Gas-Phase Nitrate Radical Production Using Irradiated Ceric Ammonium Nitrate: Insights into Secondary Organic Aerosol Formation from Biogenic and Biomass Burning Precursors. ACS Earth and Space Chemistry, 9(3), 545-559. https://doi.org/10.1021/acsearthspacechem.4c00293

Kuang, Y., Tao, J., Xu, H., Liu, L., Liu, P., Xu, W., Xu, W., Sun, Y., & Zhao, C. (2025). Theoretical framework for measuring cloud effective supersaturation fluctuations with an advanced optical system. Atmospheric Chemistry and Physics, 25(2), 1163–1174. https://doi.org/10.5194/acp-25-1163-2025

Yin, L., Bai, B., Zhang, B., Zhu, Q., Di, Q., Requia, W. J., Schwartz, J. D., Shi, L., & Liu, P.* (2025). Regional-specific trends of PM_2.5 and O₃ temperature sensitivity in the United States. npj Climate and Atmospheric Science, 8(1), 12. https://doi.org/10.1038/s41612-024-00862-4 [preprint]

Deegan, A. M., Glenn, C. K., El Hajj, O., Anosike, A., Kumar, K., Abdurrahman, M., Bai, B., Liu, P., O’Brien, J., Saleh, R., & Frossard, A. A. (2025). Properties of Surface-Active Organics in Aerosol Particles Produced from Combustion of Biomass Fuels under Simulated Prescribed-Fire and Wildfire Conditions. ACS ES&T Air, 2(2), 264-276. https://doi.org/10.1021/acsestair.4c00243

Liu, X., Liu, L., Zhang, B., Liu, P., Huang, R.-J., Hildebrandt Ruiz, L., Miao, R., Chen, Q., & Wang, X. (2024). Modeling the Global Impact of Chlorine Chemistry on Secondary Organic Aerosols. Environmental Science & Technology, 58(52), 23064-23074. https://doi.org/10.1021/acs.est.4c05037

Zhang, J., Zhu, T., Catena, A., Li, Y., Schwab, M. J., Liu, P., Asa-Awuku, A., & Schwab, J. (2024). Technical note: Quantified organic aerosol subsaturated hygroscopicity by a simple optical scatter monitor system through field measurements. Atmos. Chem. Phys., 24(23), 13445-13456. https://doi.org/10.5194/acp-24-13445-2024

Nikkho, S., Bai, B., Mahrt, F., Zaks, J., Peng, L., Kiland, K. J., Liu, P., & Bertram, A. K. (2024). Secondary Organic Aerosol from Biomass Burning Phenolic Compounds and Nitrate Radicals can be Highly Viscous over a Wide Relative Humidity Range. Environmental Science & Technology, 58(49), 21702-21715. https://doi.org/10.1021/acs.est.4c06235

Anchan, N. L., Swain, B., Sharma, A., Singh, A., Malasani, C. R., Chandrasekharan, A., Kumar, U., Ojha, N., Liu, P., Vountas, M., & Gunthe, S. S. (2024). Assessing the Variability of Aerosol Optical Depth Over India in Response to Future Scenarios: Implications for Carbonaceous Aerosols. Journal of Geophysical Research: Atmospheres, 129(18), e2024JD040846. https://doi.org/10.1029/2024JD040846

Glenn, C. K., El Hajj, O., McQueen, Z., Poland, R. P., Penland, R., Roberts, E. T., Choi, J. H., Bai, B., Shin, N., Anosike, A., Kumar, K. V., Abdurrahman, M. I., Liu, P., Amster, I. J., Smith, G. D., Flanagan, S., Callaham, M. A., Loudermilk, E. L., O’Brien, J. J., & Saleh, R. (2024). Brown Carbon Emissions from Biomass Burning under Simulated Wildfire and Prescribed-Fire Conditions. ACS ES&T Air, 1(9), 1124-1136. https://doi.org/10.1021/acsestair.4c00089

Jose, C., Singh, A., Kalkura, K. N., Jose, G. V., Srivastava, S., Ammini, R. K., Yadav, S., Ravikrishna, R., Andreae, M. O., Martin, S. T., Liu, P., & Gunthe, S. S. (2024). Complex Hygroscopic Behavior of Ambient Aerosol Particles Revealed by a Piezoelectric Technique. ACS Earth and Space Chemistry, 8(5), 983–991. https://doi.org/10.1021/acsearthspacechem.3c00347

Strawson, I., Faïn, X., Bauska, T. K., Muschitiello, F., Vladimirova, D. O., Tetzner, D. R., Humby, J., Thomas, E. R., Liu, P., Zhang, B., Grilli, R., & Rhodes, R. H. (2024). Historical Southern Hemisphere biomass burning variability inferred from ice core carbon monoxide records. Proceedings of the National Academy of Sciences, 121(33), e2402868121. https://doi.org/10.1073/pnas.2402868121

Zhang, B., Chellman, N. J., Kaplan, J. O., Mickley, L. J., Ito, T., Wang, X., Wensman, S. M., McCrimmon, D., Steffensen, J. P., McConnell, J. R., & Liu, P.* (2024). Improved biomass burning emissions from 1750 to 2010 using ice core records and inverse modeling. Nature Communications, 15(1), 3651. https://doi.org/10.1038/s41467-024-47864-7

Kuang, Y., Xu, W., Tao, J., Luo, B., Liu, L., Xu, H., Xu, W., Xue, B., Zhai, M., Liu, P., and Sun, Y. (2024). Divergent Impacts of Biomass Burning and Fossil Fuel Combustion Aerosols on Fog-Cloud Microphysics and Chemistry: Novel Insights From Advanced Aerosol-Fog Sampling, Geophys. Res. Lett., 51, e2023GL107147, https://doi.org/10.1029/2023GL107147.

Malasani, C. R., Swain, B., Patel, A., Pulipatti, Y., Anchan, N. L., Sharma, A., Vountas, M., Liu, P., & Gunthe, S. S. (2024). Modeling of mercury deposition in India: evaluating emission inventories and anthropogenic impacts [10.1039/D4EM00324A]. Environmental Science: Processes & Impacts, 26(11), 1999-2009. https://doi.org/10.1039/D4EM00324A

Soni, M., Sander, R., Sahu, L. K., Taraborrelli, D., Liu, P., Patel, A., Girach, I. A., Pozzer, A., Gunthe, S. S., and Ojha, N. (2023). Comprehensive multiphase chlorine chemistry in the box model CAABA/MECCA: implications for atmospheric oxidative capacity, Atmos. Chem. Phys., 23, 15165-15180, 10.5194/acp-23-15165-2023. https://acp.copernicus.org/articles/23/15165/2023/

Lambe, A. T., Bai, B., Takeuchi, M., Orwat, N., Zimmerman, P. M., Alton, M. W., Ng, N. L., Freedman, A., Claflin, M. S., Gentner, D. R., Worsnop, D. R., & Liu, P. (2023). Technical note: Gas-phase nitrate radical generation via irradiation of aerated ceric ammonium nitrate mixtures. Atmos. Chem. Phys., 23(21), 13869-13882. https://doi.org/10.5194/acp-23-13869-2023

Singh, A., Raj, S. S., Panda, U., Kommula, S. M., Jose, C., Liu, T., Huang, S., Swain, B., Pöhlker, M. L., Reyes-Villegas, E., Ojha, N., Vaishya, A., Bigi, A., Ravikrishna, R., Zhu, Q., Shi, L., Allen, J., Martin, S. T., McFiggans, G., Andreae, M. O., Pöschl, U., Coe, H., Bianchi, F., Su, H., Kanawade, V. P., Liu, P.*, and Gunthe, S. S.*: Rapid growth and high cloud-forming potential of anthropogenic sulfate aerosol in a thermal power plant plume during COVID lockdown in India, npj Climate and Atmospheric Science, 6, 109, 10.1038/s41612-023-00430-2, 2023. https://www.nature.com/articles/s41612-023-00430-2

Lee, W.-C., Liu, P., Han, Y., Martin, S. T., & Kuwata, M. (2023). Accounting for Cloud Nucleation Activation Mechanism of Secondary Organic Matter from α-Pinene Oxidation Using Experimentally Retrieved Water Solubility Distributions. Environmental Science & Technology, 57(36), 13439-13448. https://doi.org/10.1021/acs.est.3c03039

Li, Y.+, Bai, B+., Dykema, J., Shin, N., Lambe, A. T., Chen, Q., Kuwata, M., Ng, N. L., Keutsch, F. N.*, & Liu, P.* (2023). Predicting Real Refractive Index of Organic Aerosols From Elemental Composition. Geophysical Research Letters, 50(12), e2023GL103446. https://doi.org/10.1029/2023GL103446 (+ contribute equally)

Jo, H.-Y., Park, J., Heo, G., Lee, H.-J., Jeon, W., Kim, J.-M., Kim, S., Kim, J.-K., Liu, Y., Liu, P., Zhang, B., & Kim, C.-H. (2023). Interpretation of the effects of anthropogenic chlorine on nitrate formation over northeast Asia during KORUS-AQ 2016. Science of The Total Environment, 894, 164920. https://doi.org/10.1016/j.scitotenv.2023.164920

Hao, H., Wang, Y., Zhu, Q., Zhang, H., Rosenberg, A., Schwartz, J., Amini, H., van Donkelaar, A., Martin, R., Liu, P., Weber, R., Russel, A., Yitshak-sade, M., Chang, H., & Shi, L. (2023). National Cohort Study of Long-Term Exposure to PM_2.5 Components and Mortality in Medicare American Older Adults. Environmental Science & Technology, 57(17), 6835-6843. https://doi.org/10.1021/acs.est.2c07064

Wang, Y., Liu, P.*, Schwartz, J., Castro, E., Wang, W., Chang, H., Scovronick, N., & Shi, L.* (2023). Disparities in ambient nitrogen dioxide pollution in the United States. Proceedings of the National Academy of Sciences, 120(16), e2208450120. https://doi.org/10.1073/pnas.2208450120 [PNAS Podcast]

Tao, J., Kuang, Y., Luo, B., Liu, L., Xu, H., Ma, N., Liu, P., Xue, B., Zhai, M., Xu, W., Xu, W., & Sun, Y. (2023). Kinetic Limitations Affect Cloud Condensation Nuclei Activity Measurements Under Low Supersaturation. Geophysical Research Letters, 50(4), e2022GL101603. https://doi.org/10.1029/2022GL101603

Shi, L.*, Zhu, Q., Wang, Y., Hao, H., Zhang, H., Schwartz, J., Amini, H., van Donkelaar, A., Martin, R. V., Steenland, K., Sarnat, J. A., Caudle, W. M., Ma, T., Li, H., Chang, H. H., Liu, J. Z., Wingo, T., Mao, X., Russell, A. G., Weber, R. J., Liu, P.* (2023). Incident dementia and long-term exposure to constituents of fine particle air pollution: A national cohort study in the United States. Proceedings of the National Academy of Sciences, 120(1), e2211282119. https://doi.org/10.1073/pnas.2211282119

Gopinath, A. K., Raj, S. S., Kommula, S. M., Jose, C., Panda, U., Bishambu, Y., Ojha, N., Ravikrishna, R., Liu, P.*, & Gunthe, S. S.* (2022). Complex Interplay Between Organic and Secondary Inorganic Aerosols With Ambient Relative Humidity Implicates the Aerosol Liquid Water Content Over India During Wintertime. Journal of Geophysical Research: Atmospheres, 127(13), e2021JD036430. https://doi.org/10.1029/2021JD036430

Ma, T., Yazdi, M. D., Schwartz, J., Réquia, W. J., Di, Q., Wei, Y., Chang, H. H., Vaccarino, V., Liu, P., & Shi, L. (2022). Long-term air pollution exposure and incident stroke in American older adults: A national cohort study. Global Epidemiology, 4, 100073. https://doi.org/10.1016/j.gloepi.2022.100073

Chen, Y.*, Wang, Y., Nenes, A., Wild, O., Song, S., Hu, D., Liu, D., He, J., Hildebrandt Ruiz, L., Apte, J. S., Gunthe, S. S.*, & Liu, P.* (2022). Ammonium Chloride Associated Aerosol Liquid Water Enhances Haze in Delhi, India. Environmental Science & Technology, 56(11), 7163-7173. https://doi.org/10.1021/acs.est.2c00650

Zhang, B., Shen, H., Yun, X., Zhong, Q., Henderson, B. H., Wang, X., Shi, L., Gunthe, S. S., Huey, L. G., Tao, S., Russell, A. G., & Liu, P.* (2022). Global Emissions of Hydrogen Chloride and Particulate Chloride from Continental Sources. Environmental Science & Technology, 56(7), 3894-3904. https://doi.org/10.1021/acs.est.1c05634

Li J, Wang Y, Steenland K, Liu P, van Donkelaar A, Martin RV, Chang HH, Caudle WM, Schwartz J, Koutrakis P, Shi L. Long-term effects of PM_2.5 components on incident dementia in the northeastern United States. The Innovation. 2022;3(2):100208. doi: https://doi.org/10.1016/j.xinn.2022.100208.

Qin, Y., Ye, J., Ohno, P., Liu, P., Wang, J., Fu, P., Zhou, L., Li, Y. J., Martin, S. T., & Chan, C. K. (2022). Assessing the Nonlinear Effect of Atmospheric Variables on Primary and Oxygenated Organic Aerosol Concentration Using Machine Learning. ACS Earth and Space Chemistry, 6(4), 1059-1066. https://doi.org/10.1021/acsearthspacechem.1c00443

Zhai, J., Yang, X., Li, L., Bai, B., Liu, P., Huang, Y., Fu, T.-M., Zhu, L., Zeng, Z., Tao, S., Lu, X., Ye, X., Wang, X., Wang, L., & Chen, J. (2022). Absorption Enhancement of Black Carbon Aerosols Constrained by Mixing-State Heterogeneity. Environmental Science & Technology, 56(3), 1586-1593. https://doi.org/10.1021/acs.est.1c06180

Wang, Y., Xiao, S., Zhang, Y., Chang, H., Martin, R. V., Van Donkelaar, A., Gaskins, A., Liu, Y., Liu, P., & Shi, L. (2022). Long-term exposure to PM_2.5 major components and mortality in the southeastern United States. Environment International, 158, 106969. https://doi.org/10.1016/j.envint.2021.106969

Shi, L., Rosenberg, A., Wang, Y., Liu, P., Danesh Yazdi, M., Réquia, W., Steenland, K., Chang, H., Sarnat, J. A., Wang, W., Zhang, K., Zhao, J., & Schwartz, J. (2022). Low-Concentration Air Pollution and Mortality in American Older Adults: A National Cohort Analysis (2001–2017). Environmental Science & Technology, 56(11), 7194–7202. https://doi.org/10.1021/acs.est.1c03653

Qian, Y., Li, H., Rosenberg, A., Li, Q., Sarnat, J., Papatheodorou, S., Schwartz, J., Liang, D., Liu, Y., Liu, P., & Shi, L. (2021). Long-Term Exposure to Low-Level NO₂ and Mortality among the Elderly Population in the Southeastern United States. Environmental Health Perspectives, 129(12), 127009. https://doi.org/10.1289/EHP9044

Shi, L., Steenland, K., Li, H., Liu, P., Zhang, Y., Lyles, R. H., Requia, W. J., Ilango, S. D., Chang, H. H., Wingo, T., Weber, R. J., & Schwartz, J. (2021). A national cohort study (2000–2018) of long-term air pollution exposure and incident dementia in older adults in the United States. Nature Communications, 12(1), 6754. https://doi.org/10.1038/s41467-021-27049-2

Zhai, S., Jacob, D. J., Brewer, J. F., Li, K., Moch, J. M., Kim, J., Lee, S., Lim, H., Lee, H. C., Kuk, S. K., Park, R. J., Jeong, J. I., Wang, X., Liu, P., Luo, G., Yu, F., Meng, J., Martin, R. V., Travis, K. R., Hair, J. W., Anderson, B. E., Dibb, J. E., Jimenez, J. L., Campuzano-Jost, P., Nault, B. A., Woo, J.-H., Kim, Y., Zhang, Q., Liao, H. (2021). Relating geostationary satellite measurements of aerosol optical depth (AOD) over East Asia to fine particulate matter (PM_2.5): insights from the KORUS-AQ aircraft campaign and GEOS-Chem model simulations. Atmos. Chem. Phys., 21(22), 16775-16791. https://doi.org/10.5194/acp-21-16775-2021

McConnell, J. R., Chellman, N. J., Mulvaney, R., Eckhardt, S., Stohl, A., Plunkett, G., Kipfstuhl, S., Freitag, J., Isaksson, E., Gleason, K. E., Brugger, S. O., McWethy, D. B., Abram, N. J., Liu, P., & Aristarain, A. J. (2021). Hemispheric black carbon increase after the 13th-century Māori arrival in New Zealand. Nature, 598(7879), 82-85. https://doi.org/10.1038/s41586-021-03858-9

Kommula, S. M., Upasana, P., Sharma, A., Raj, S. S., Reyes-villegas, E., Liu, T., Allan, J. D., Jose, C., Pöhlker, M. L., Ravikrishna, R., Liu, P., Su, H., Martin, S. T., Pöschl, U., McFiggans, G., Coe, H., & Gunthe, S. S. (2021). Chemical Characterization and Source Apportionment of Organic Aerosols in the Coastal City of Chennai, India: Impact of Marine Air Masses on Aerosol Chemical Composition and Potential for Secondary Organic Aerosol Formation. ACS Earth and Space Chemistry, 5(11), 3197-3209. https://doi.org/10.1021/acsearthspacechem.1c00276

Qin, Y., Ye, J., Ohno, P., Zhai, J., Han, Y., Liu, P., Wang, J., Zaveri, R. A., & Martin, S. T. (2021). Humidity Dependence of the Condensational Growth of α-Pinene Secondary Organic Aerosol Particles. Environmental Science & Technology, 55(21), 14360-14369. https://doi.org/10.1021/acs.est.1c01738

Zhai, S., Wang, X., McConnell, J. R., Geng, L., Cole-Dai, J., Sigl, M., Chellman, N., Sherwen, T., Pound, R., Fujita, K., Hattori, S., Moch, J. M., Zhu, L., Evans, M., Legrand, M., Liu, P. , Pasteris, D. Chan, Y.-C., Murray, L. T., Alexander, B.: Anthropogenic impacts on tropospheric reactive chlorine since the preindustrial. Geophysical Research Letters, 48, e2021GL093808. https://doi.org/10.1029/2021GL093808.

Zhang, B., Shen, H., Liu, P., Guo, H., Hu, Y., Chen, Y., Xie, S., Xi, Z., Skipper, T. N., & Russell, A. G. (2021). Significant contrasts in aerosol acidity between China and the United States. Atmos. Chem. Phys., 21(10), 8341-8356. https://doi.org/10.5194/acp-21-8341-2021

Liu, P.*, Kaplan, J. O., Mickley, L. J., Li, Y., Chellman, N. J., Arienzo, M. M., Kodros, J. K., Pierce, J. R., Sigl, M., Freitag, J., Mulvaney, R., Curran, M. A. J., & McConnell, J. R. Improved estimates of preindustrial biomass burning reduce the magnitude of aerosol climate forcing in the Southern Hemisphere. Science Advances, 7(22), eabc1379. https://doi.org/10.1126/sciadv.abc1379

Gunthe, S. S.*, Liu, P.*, Panda, U., Raj, S. S., Sharma, A., Darbyshire, E., Reyes-Villegas, E., Allan, J., Chen, Y., Wang, X., Song, S., Pöhlker, M. L., Shi, L., Wang, Y., Kommula, S. M., Ravikrishna, R., Ojha, N., McFiggans, G., Mickley, L. J., Martin, S. T., Pöschl, U., Andreae, M. O., & Coe, H. (2021). Enhanced Aerosol Particle Growth Sustained by High Continental Chlorine Emission in India. Nature Geoscience, 14, 77–84. https://doi.org/10.1038/s41561-020-00677-x. (* Corresponding authors) [News & Views] [Behind the Paper] [Chemistry World]

Wang, J., Ye, J., Zhang, Q., Zhao, J., Wu, Y., Li, J., Liu, D., Li, W., Zhang, Y., Wu, C., Xie, C., Qin, Y., Lei, Y., Huang, X., Guo, J., Liu, P., Fu, P., Li, Y., Lee, H. C., Choi, H., Zhang, J., Liao, H., Chen, M., Sun, Y., Ge, X., Martin, S. T., and Jacob, D. J.: Aqueous production of secondary organic aerosol from fossil-fuel emissions in winter Beijing haze, Proceedings of the National Academy of Sciences, 118(8), e2022179118. https://doi.org/10.1073/pnas.2022179118 [News Release]

Song, S., Ma, T., Zhang, Y., Shen, L., Liu, P., Li, K., Zhai, S., Zheng, H., Gao, M., Moch, J. M., Duan, F., He, K., & McElroy, M. B. (2021). Global modeling of heterogeneous hydroxymethanesulfonate chemistry. Atmos. Chem. Phys., 21(1), 457-481. https://doi.org/10.5194/acp-21-457-2021

Liang, D., Shi, L., Zhao, J., Liu, P., Schwartz, J., Gao, S., Sarnat, J., Liu, Y., Ebelt, S., Scovronick, N. and Chang, H.H., 2020. Urban Air Pollution May Enhance COVID-19 Case-Fatality and Mortality Rates in the United States. the Innovation, Volume 1, Issue 3, 100047. link

Shi, L.; Wu, X.; Yazdi, M.; Braun, D.; Awad, Y.A.; Wei, Y.; Liu, P.; Di, Q.; Wang, Y.; Schwartz, J.; Dominici, F.; Kioumourtzoglou, M.A.; Zanobetti, A., Long-term Effects of Fine Particulate Matter on Neurological Disorders in the US Medicare Population: a nationwide analysis, Lancet Planetary Health, Volume 4, Issue 12, e557 – e565. link

Qin, Y.; Ye, J.; Ohno, P. E.; Lei, Y.; Wang, J.; Liu, P.; Thomson, R. J.; Martin, S. T., Synergistic Uptake by Acidic Sulfate Particles of Gaseous Mixtures of Glyoxal and Pinanediol. Environ. Sci. Technol. 2020.

Li, Y., Mickley, L. J., Liu, P., and Kaplan, J. O.: Trends and spatial shifts in lightning fires and smoke concentrations in response to 21st century climate over the national forests and parks of the western United States, Atmos. Chem. Phys., 20, 8827–8838, https://doi.org/10.5194/acp-20-8827-2020, 2020.

Wang, J., Li, J., Ye, J., Zhao, J., Wu, Y., Hu, J., Liu, D., Nie, D., Shen, F., Huang, X., Huang, D. D., Ji, D., Sun, X., Xu, W., Guo, J., Song, S., Qin, Y., Liu, P., Turner, J. R., Lee, H. C., Hwang, S., Liao, H., Martin, S. T., Zhang, Q., Chen, M., Sun, Y., Ge, X., Jacob, D. J., Fast sulfate formation from oxidation of SO₂ by NO₂ and HONO observed in Beijing haze. Nature Communications 2020, 11, (1), 2844.

Song, S., Nenes, A., Gao, M., Zhang, Y., Liu, P., Shao, J., Ye, D., Xu, W., Lei, L., Sun, Y. and Liu, B., 2019. Thermodynamic Modeling Suggests Declines in Water Uptake and Acidity of Inorganic Aerosols in Beijing Winter Haze Events during 2014/2015–2018/2019. Environmental Science & Technology Letters, 6(12), pp.752-760.

Han, Y., Gong, Z., Liu, P., de Sá, S. S., McKinney, K. A., & Martin, S. T.: Influence of Particle Surface Area Concentration on the Production of Organic Particulate Matter in a Continuously Mixed Flow Reactor. Environmental science & technology, 53(9), 4968-4976, 2019.

Han, Y., Gong, Z., Ye, J., Liu, P., McKinney, K.A. and Martin, S.T., 2019. Quantifying the Role of the Relative Humidity-Dependent Physical State of Organic Particulate Matter in the Uptake of Semivolatile Organic Molecules. Environmental Science & Technology, 53(22), pp.13209-13218.

Wang, Y., Liu, P., Li, Y. J., Bateman, A. P., Martin, S. T., & Hung, H.-M. (2018). The Reactivity of Toluene-Derived Secondary Organic Material with Ammonia and the Influence of Water Vapor. The Journal of Physical Chemistry A, 122(38), 7739–7747. https://doi.org/10.1021/acs.jpca.8b06685

Liu, P., Song, M., Zhao, T. N., Gunthe, S. S., Ham, S., He, Y. P., Qin, Y. M., Gong, Z. H., Amorim, J. C., Bertram, A. K., Martin, S. T.: Resolving the Mechanisms of Hygroscopic Growth and Cloud Condensation Nuclei Activity for Organic Particulate Matter, Nature Communications, 9, 4076, doi:10.1038/s41467-018-06622-2, 2018.

Liu, P., Li, Y. J., Wang, Y., Bateman, A. P., Zhang, Y., Gong, Z. H., Bertram, A. K., Martin, S. T.: Highly viscous states affect the browning of atmospheric organic particulate matter, ACS Central Science, 4(2), 207–215, 2018.

Zhang, Y., Liu, P., Gong, Z., Geiger, F. M., Martin, S. T.: Production and Measurement of Organic Particulate Matter in a Flow Tube Reactor. JoVE (Journal of Visualized Experiments), (142), e55684, 2018.

Gong, Z.; Han, Y.; Liu, P.; Ye, J.; Keutsch, F. N.; McKinney, K. A.; Martin, S. T., Influence of Particle Physical State on the Uptake of Medium-Sized Organic Molecules. Environ. Sci. Technol., 2018, 52 (15), 8381-8389.

Li, Y. J.; Liu, P.; Bergoend, C.; Bateman, A. P.; Martin, S. T., Rebounding hygroscopic inorganic aerosol particles: liquids, gels, and hydrates. Aerosol Sci. Tech., 51(3), 388-396, 2017.

Gray Be, A.; Upshur, M. A.; Liu, P.; Martin S. T.; Geiger, F; Thomson, R., Cloud activation potentials for atmospheric α-pinene and β-caryophyllene ozonolysis products. ACS Central Science, 3(7), 715-725, 2017.

Song, M., Liu, P., Martin, S. T., and Bertram, A. K.: Liquid-liquid phase separation in particles containing secondary organic material free of inorganic salts, Atmos. Chem. Phys., 17, 11261-11271, 2017.

Rastak, N., Pajunoja, A., Acosta Navarro, J. C., Ma, J., Song, M., Partridge, D. G., Kirkevåg, A., Leong, Y., Hu, W. W., Taylor, N. F., Lambe, A., Cerully, K., Bougiatioti, A., Liu, P., Krejci, R., Petäjä, T., Percival, C., Davidovits, P., Worsnop, D. R., Ekman, A. M. L., Nenes, A., Martin, S., Jimenez, J. L., Collins, D. R., Topping, D. O., Bertram, A. K., Zuend, A., Virtanen, A., and Riipinen, I.: Microphysical explanation of the RH-dependent water affinity of biogenic organic aerosol and its importance for climate, Geophys. Res. Lett., 10.1002/2017GL073056, 2017.

Wang, Y.; Lee, M; Liu, P.; Shi, L. H.; Yu, Z.; Awad, Y. A.; Zanobetti, A; Schwartz, J. D., Doubly robust additive hazards models to estimate effects of a continuous exposure on survival. Epidemiology, 28(6), 771-779, 2017.

Wang, Y.; Shi, L. H.; Lee, M; Liu, P.; Di, Q.; Zanobetti, A; Schwartz, J. D., Long-term exposure to PM_2.5 and mortality among older adults in the Southeastern US. Epidemiology, 28(2), 207-214, 2017.

Liu, P., Li, Y. J., Wang, Y., Gilles, M. K., Zaveri, R. A., Bertram, A. K., and Martin, S. T.: Lability of secondary organic particulate matter, Proc. Natl. Acad. Sci. U.S.A., 113(45), 12643-12648, 2016.

Bateman, A. P., Gong, Z., Liu, P., Sato, B., Cirino, G., Zhang, Y., Artaxo, P., Bertram, A. K., Manzi, A. O., Rizzo, L. V., Souza, R. A. F., Zaveri, R. A., and Martin, S. T.: Sub-micrometre particulate matter is primarily in liquid form over Amazon rainforest, Nature Geosci, 9, 34-37, 2016.

Song, M.; Liu, P.; Hanna, S. J.; Zaveri, R. A.; Potter, K.; You, Y.; Martin, S. T.; Bertram, A. K., Relative humidity-dependent viscosity of secondary organic material from toluene photo-oxidation and possible implications for organic particulate matter over megacities. Atmos. Chem. Phys., 16, 8817-8830, 2016.

Renbaum-Wolff, L.; Song, M.; Marcolli, C.; Zhang, Y.; Liu, P.; Grayson, J. W.; Geiger, F. M.; Martin, S. T.; Bertram, A. K., Observations and implications of liquid–liquid phase separation at high relative humidities in secondary organic material produced by α-pinene ozonolysis without inorganic salts. Atmos. Chem. Phys., 16, 7969-7979, 2016.

*Shi, L. H., *Liu, P.; Kloog, I; Lee, M; Kosheleva, A; Schwartz, J. D., Estimating daily air temperature across the Southeastern USA using high-resolution satellite data: A statistical modeling study. Environ. Res., 146, 51-58, 2016. (*contributed equally)

Shi, L. H.; Liu, P.; Zanebetti, A; Kosheleva, A; Schwartz, J. D., Chronic effects of temperature on mortality in the Southeastern USA using satellite-based exposure metrics, Scientific Reports, 6, 30161, 2016.

Liu, P., Abdelmalki, N., Hung, H. M., Wang, Y., Brune, W. H., and Martin, S. T.: Ultraviolet and visible complex refractive indices of secondary organic material produced by photooxidation of the aromatic compounds toluene and m-xylene, Atmos. Chem. Phys., 15, 1435-1446, 2015.

Shi, L., Kloog, I., Zanobetti, A., Liu, P., and Schwartz, J. D.: Impacts of temperature and its variability on mortality in New England, Nature Climate Change, 5, 988-991, 2015.

Li, Y. J.; Liu, P.; Gong, Z.; Wang, Y.; Bateman, A. P.; Bergoend, C.; Martin, S. T., Chemical reactivity and liquid/non-liquid states of secondary organic material. Environ. Sci. Technol., 49(22), 13264-13274, 2015.

Song, M.; Liu, P.; Hanna, S. J.; Li, Y. J.; Martin, S. T.; Bertram, A. K., Relative humidity-dependent viscosities of isoprene-derived secondary organic material and atmospheric implications for isoprene-dominant forests. Atmos. Chem. Phys., 15, (9), 5145-5159, 2015.

Zhang, Y.; Sanchez, M. S.; Douet, C.; Wang, Y.; Bateman, A. P.; Gong, Z.; Kuwata, M.; Renbaum-Wolff, L.; Sato, B. B.; Liu, P.; Bertram, A. K.; Geiger, F. M.; Martin, S. T., Changing shapes and implied viscosities of suspended submicron particles. Atmos. Chem. Phys., 15, (14), 7819-7829, 2015.

Shrestha, M.; Zhang, Y.; Upshur, M. A.; Liu, P.; Blair, S. L.; Wang, H.-F.; Nizkorodov, S. A.; Thomson, R. J.; Martin, S. T.; Geiger, F. M., On surface order and disorder of α-pinene-derived secondary organic material. J. Phys. Chem. A, 119(19), 4609–4617, 2015.

Tao, J. C.; Zhao, C. S.; Ma, N.; Liu, P., The impact of aerosol hygroscopic growth on the single-scattering albedo and its application on the NO₂ photolysis rate coefficient. Atmos. Chem. Phys., 14, (22), 12055-12067, 2014.

Liu, P., Zhang, Y., and Martin, S. T.: Complex refractive indices of thin films of secondary organic materials by spectroscopic ellipsometry from 220 to 1200 nm, Environ. Sci. Technol., 47, 13594-13601, 2013.

Xu, W. Y.; Zhao, C. S.; Ran, L.; Deng, Z. Z.; Ma, N.; Liu, P.; Lin, W. L.; Yan, P.; Xu, X. B., A new approach to estimate pollutant emissions based on trajectory modeling and its application in the North China Plain. Atmos. Environ., 71, (0), 75-83, 2013.

Wang, J.; Mao, J.; Zhao, C.; Yan, P.; Ma, N.; Liu, P.; Liu, X., A novel four-wavelength transmissometer for distinguishing haze and fog. Acta Meteorologica Sinica, 27, (4), 556-565, 2013.

Chen, J.; Zhao, C. S.; Ma, N.; Liu, P.; Göbel, T.; Hallbauer, E.; Deng, Z. Z.; Ran, L.; Xu, W. Y.; Liang, Z.; Liu, H. J.; Yan, P.; Zhou, X. J.; Wiedensohler, A., A parameterization of low visibilities for hazy days in the North China Plain. Atmos. Chem. Phys., 12, (11), 4935-4950, 2012.

Ma, N.; Zhao, C. S.; Müller, T.; Cheng, Y. F.; Liu, P.; Deng, Z. Z.; Xu, W. Y.; Ran, L.; Nekat, B.; van Pinxteren, D.; Gnauk, T.; Müller, K.; Herrmann, H.; Yan, P.; Zhou, X. J.; Wiedensohler, A., A new method to determine the mixing state of light absorbing carbonaceous using the measured aerosol optical properties and number size distributions. Atmos. Chem. Phys., 12, (5), 2381-2397, 2012.

Ma, N.; Zhao, C. S.; Nowak, A.; Müller, T.; Pfeifer, S.; Cheng, Y. F.; Deng, Z. Z.; Liu, P.; Xu, W. Y.; Ran, L.; Yan, P.; Göbel, T.; Hallbauer, E.; Mildenberger, K.; Henning, S.; Yu, J.; Chen, L. L.; Zhou, X. J.; Stratmann, F.; Wiedensohler, A., Aerosol optical properties in the North China Plain during HaChi campaign: an in-situ optical closure study. Atmos. Chem. Phys., 11, (12), 5959-5973, 2011.

Ran, L.; Zhao, C. S.; Xu, W. Y.; Lu, X. Q.; Han, M.; Lin, W. L.; Yan, P.; Xu, X. B.; Deng, Z. Z.; Ma, N.; Liu, P.; Yu, J.; Liang, W. D.; Chen, L. L., VOC reactivity and its effect on ozone production during the HaChi summer campaign. Atmos. Chem. Phys., 11, (10), 4657-4667, 2011.

Xu, W. Y.; Zhao, C. S.; Ran, L.; Deng, Z. Z.; Liu, P.; Ma, N.; Lin, W. L.; Xu, X. B.; Yan, P.; He, X.; Yu, J.; Liang, W. D.; Chen, L. L., Characteristics of pollutants and their correlation to meteorological conditions at a suburban site in the North China Plain. Atmos. Chem. Phys., 11, (9), 4353-4369, 2011.

Deng, Z. Z.; Zhao, C. S.; Ma, N.; Liu, P.; Ran, L.; Xu, W. Y.; Chen, J.; Liang, Z.; Liang, S.; Huang, M. Y.; Ma, X. C.; Zhang, Q.; Quan, J. N.; Yan, P.; Henning, S.; Mildenberger, K.; Sommerhage, E.; Schäfer, M.; Stratmann, F.; Wiedensohler, A., Size-resolved and bulk activation properties of aerosols in the North China Plain. Atmos. Chem. Phys., 11, (8), 3835-3846, 2011.

Liu, P., Zhao, C. S., Göbel, T., Hallbauer, E., Nowak, A., Ran, L., Xu, W. Y., Deng, Z. Z., Ma, N., Mildenberger, K., Henning, S., Stratmann, F., and Wiedensohler, A.: Hygroscopic properties of aerosol particles at high relative humidity and their diurnal variations in the North China Plain, Atmos. Chem. Phys., 11, 3479-3494, 2011.

Xiao, X. Z.; Liu, P.; Geng, F. H.; Gao, W.; Zhen, C. M.; Zhao, C. S., Comparison of black carbon aerosols in urban and suburban areas of Shanghai. J. App. Meteorol. Sci., 22, (2), 158-168, 2011 (in Chinese).

Liu, P.; Liu, S. H.; Hu, F.; Lv, S.; Liu, H.; Zhang, Y.; Chen, G.; Liang, F., A comparison of the different methods for estimating turbulent fluxes and their errors. Acta Meteorologica Sinica, 68, (4), 487-500, 2010 (in Chinese).

Liu, P., Zhao, C., Zhang, Q., Deng, Z., Huang, M., Ma, X., and Tie, X.: Aircraft study of aerosol vertical distributions over Beijing and their optical properties, Tellus B, 61, 756-767, 2009.