PUBLICATIONS

Positive matrix factorization outperforms machine learning in imputing missing PM₂.₅ and further identifying spatial patterns in multi-sites without external data

Youngkwon Kim,Philip K. Hopke, Seung-Muk Yi, Woojoo Lee ,Ho Kim, JongBae Heo f, Hwajin Kim,Young Su Lee,,Kwonho Jeon,Jieun Park

2025.08

Urban Climate (Elsevier)

Source-resolved volatility and oxidation state decoupling in wintertime organic aerosols in Seoul

Hwajin Kim, Jiwoo Jeong, Jihye Moon, and Hyun Gu Kang

2026

Atmospheric Chemistry and Physics

In silico analysis of deposition efficiency and health impacts of metal-oxide-enriched carbon aerosols in indoor environments

Hyeon-Ju Oh, Hwajin Kim

2026

Ecotoxicology and Environmental Safety

Wintertime Trends of Fine Particulate Matter (PM2.5) in South Korea, 2012-2022: Response of Nitrate and Organic Components to Decreasing NOx Emissions

Drew C. Pendergrass, Daniel J. Jacob, Yujin J. Oak, Ruijun Dang, Laura Hyesung Yang, Ellie Beaudry, Nadia K. Colombi, Shixian Zhai, Hwajin Kim, Jin-soo Choi, Jin-soo Park, Soontae Kim, Ke Li, Hong Liao

2025

GEOPHYSICAL RESEARCH LETTERS

Photochemical processing of dissolved organic matter in fog water: oxidation and functionalization pathways driving organic aerosol evolution

Wenqing Jiang, Lijuan Li, Lu Yu, Hwajin Kim, Yele Sun, and Qi Zhang

2025

Atmospheric Chemistry and Physics

Impact of CrIS-Derived NH3 Emission Updates on Simulated Nitrate and Ammonium Aerosols over East Asia.

Kyoung-MinKim, Si-WanKim,SeunghwanSeo,CongmengLyu,BrianC.McDonald, MarkW. Shephard, JoseL. Jimenez,HwajinKim,CheolsooLim,Hye-JungShin, JeongAhYu, JackE.Dibb,L.GregoryHuey,PaulO.Wennberg, ShannonCapps, Jung-hunWoo,DuseongS. Jo, andJhoonKim

2025

Environmental Science & Technology

Source and condition specific toxicity of combustion-derived PM: Linking physicochemical properties with acellular and cellular assays

Jaewon Seo, Hwajin Kim, Eunha Park, Jisu Woo, Kyoung-Hee Lee.

2025

Journal of Hazardous Materials

Year-Round Analysis of Multiphase Sulfate Production in Aerosol Particles in East Asia

Katherine R. Travis, Benjamin A. Nault, James H. Crawford, Hwajin Kim, Qi Chen, Yan Zheng, Tengyu Liu, Jose L. Jimenez, Pedro Campuzano-Jost, Paul O. Wennberg, John D. Crounse, L. Gregory Huey.

2025

ACS ES&T Air

Characterization of particulate matter at Mt. Gwanak (at 632 m) and vertical mixing impacts on haze in Seoul during winter

Sujin Kwon , Qihua Hu , Jaewon Seo , Soyoung Park , Jihye Moon , Jaeuk Kim ,Sungjin Park ,Yoojin Park , Hwajin Kim

2025

Science of The Total Environment

Is replacing missing values of PM2.5 constituents with estimates using machine learning better for source apportionment than exclusion or median replacement?

Youngkwon Kim, Seung-Muk Yi, Jongbae Heo, Hwajin Kim, Woojoo Lee, Ho Kim, Philip K. Hopke, Young Su Lee, Hye-Jung Shin, Jungmin Park, Myungsoo Yoo, Kwonho Jeon, Jieun Park

2024.05

Environmental Pollution