Changes in Metal Solubility in PM_2.5 in Xi'an City Under Clean Heating Policies: Effects of Emission Source and Aerosol Acidity.

ABSTRACT: Clean heating policies were implemented in rural areas of Shaanxi Province in 2017 to alleviate severe air pollution. To evaluate their impacts on bioavailability of PM_2.5-bound metals, the influence of emission sources and aerosol acidity on PM_2.5-bound metal solubility was explored in Xi'an over three policy-defined periods between 2016 and 2021. Results showed that aerosol pH increased progressively from 4.81 ± 1.82 to 5.29 ± 1.79 following policy implementation, closely associated with reductions in SO₂ and NO₂ concentrations due to emission controls. Metal concentrations decreased significantly over the study period. In contrast, metal solubility exhibited clear source-dependent variations. Solubilities of metals associated with coal combust

SUBMITTER: Yan H 

PROVIDER: S-EPMC12945187 | biostudies-literature | 2026 Feb

REPOSITORIES: biostudies-literature