Seasonal variation of PM2.5 acidity in ammonia-enriched regions: A machine learning framework for estimating ammonia concentrations

2026-07-01

PRE

Yunfei Wei

Wei Zhang

Jingshen Zhang

Yan Liu

Qixiang Xu *

Nan Jiang *

DOI：10.1016/j.atmosenv.2026.122208

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• XGBoost demonstrated superior NH3 prediction accuracy (R2 = 0.96). • PH peaked in winter (5.8) and reached its lowest value in summer (2.7). • Ca2+ dominated autumn pH shifts, RH primarily influenced summer pH dynamics. • TNH3 exhibited heightened pH sensitivity at lower concentrations.

Seasonal variation of PM2.5 acidity in ammonia-enriched regions: A machine learning framework for estimating ammonia concentrations

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