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Future projections of winter haze events in northern East Asia under different Shared Socioeconomic Pathways (SSPs)
| Year of publication | 2025 | |||||
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| Title of paper | Future projections of winter haze events in northern East Asia under different Shared Socioeconomic Pathways (SSPs) | |||||
| Author | Jaein Jeong, Rokjin Park, Sang-Wook Yeh | |||||
| Publication in journal | Science of The Total Environment | |||||
| Status of publication | published | |||||
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Despite stringent environmental regulations, winter haze events remain a significant air quality issue in northern East Asia. Here, we first investigate the relationship between the Haze Weather Index (HWI), an index of winter atmospheric stagnation, and observed surface PM2.5 concentrations. We find a strong correlation between daily HWI and PM2.5 levels in eastern China and South Korea. In the Beijing–Tianjin–Hebei (BTH) region (winters 2014/15–2022/23), daily mean PM2.5 concentrations increased by 32 μg m−3 (+36 %) under moderate haze conditions (HWI > 0.5) and by 44 μg m−3 (+51 %) under severe haze conditions (HWI > 1.5). Conversely, PM2.5 concentrations decreased by 35 μg m−3 (−40 %) under clean conditions (HWI < −0.5) and by 49 μg m−3 (−55 %) under very clean conditions (HWI < −1.5). To assess the potential impact of climate change on future haze events, we analyzed an ensemble …