Preprints
https://doi.org/10.5194/egusphere-2025-2786
https://doi.org/10.5194/egusphere-2025-2786
23 Jul 2025
 | 23 Jul 2025
Status: this preprint is open for discussion and under review for Atmospheric Chemistry and Physics (ACP).

Quantifying the driving factors of particulate matter variabilities in the Beijing-Tianjin-Hebei and Yangtze River Delta regions from 2015 to 2020 by machine learning approach

Zhongfeng Pan, Hao Yin, Zhenda Sun, Chongyang Li, Youwen Sun, and Cheng Liu

Abstract. Particulate matter (PM) pollution is a critical air quality challenge in China. This study quantifies meteorological versus anthropogenic contributions to PM variations in Beijing-Tianjin-Hebei (BTH) and Yangtze River Delta (YRD) (20152020) using ground observations, meteorological assimilated data, emission inventories, and a LightGBM model. Observations show significant PM2.5 and PM10 declines (e.g., BTH PM2.5: 0.07 ± 0.03 μg m⁻³ yr⁻¹; PM10: 0.11 ± 0.04 21 μg m⁻³ yr⁻¹). Model decomposition identifies anthropogenic emission reductions as the primary driver (PM2.5 decrease: 7.19–24.76 μg m⁻³; PM10 decrease: 0.40–27.12 μg m⁻³). Key meteorological drivers differ: 2-m specific humidity (QV2M), sea-level pressure (SLP), 2-m temperature (T2M), and 10-m meridional (V10M) collectively explain 15 % of PM2.5 variance; precipitation flux (PRECTOT) is critical for PM10. PM2.5 concentrations are primarily governed by PM10, CO, NO2, and SO2 (cumulative contribution 37.60 %), while PM10 variations center on PM2.5, interacting with NO2, CO, and SO2 (explaining 34 % variance). PM2.5 shows stronger correlation with CO than PM10 (regional difference +0.07+0.08), linked to combustion/SOA. SO₂/NO₂ exhibit comparable PM correlations but divergent mechanisms: NO₂ with traffic/nitrate, SO₂ with stationary sources/sulfate, both via "co-emission-chemical transformation-meteorological synergy". Our research support optimizing region-specific control strategies.

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Zhongfeng Pan, Hao Yin, Zhenda Sun, Chongyang Li, Youwen Sun, and Cheng Liu

Status: open (until 03 Sep 2025)

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Zhongfeng Pan, Hao Yin, Zhenda Sun, Chongyang Li, Youwen Sun, and Cheng Liu
Zhongfeng Pan, Hao Yin, Zhenda Sun, Chongyang Li, Youwen Sun, and Cheng Liu

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Short summary
This study examines air pollution in Beijing-Tianjin-Hebei and the Yangtze River Delta from 2015 to 2020. PM2.5 decreased by 7.19–24.76μg/m³ and PM10 by 0.40–27.12μg/m³. Weather factors like humidity, air pressure, and rainfall influenced pollution, with tailored solutions needed for different regions.
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