Quantifying regional transport contributions to PM-bound trace elements in a southeast coastal island of China: Insights from a machine learning approach.

Identifying and quantifying pollution sources and their associated health risks are essential for formulating effective pollution control policies. This study analyzed PM-bound trace elements based on one year of sampling data collected from a low-PM island in southeastern coastal China. A de-weathered model based on the eXtreme Gradient Boosting (XGBoost) algorithm was applied to remove meteorological influences and estimate local baseline pollutant concentrations.

Changing ozone sensitivity in Fujian Province, China, during 2012-2021: Importance of controlling VOC emissions.

In the troposphere, ozone (O) formation can be limited by NOx, VOCs, or both, complicating efforts to reduce O by controlling its precursors. This study used formaldehyde (HCHO) data and nitrogen dioxide (NO) data from the Ozone Monitoring Instrument (OMI) to analyze O formation sensitivity in Fujian from 2012 to 2021. Over the past decade, an 8.