Spatiotemporal variations and trends of air quality in major cities in Guizhou

Tracking the evolution of air pollutants has a critical impact on our ability to further improve quality, which have been extensively studied in North China Plain (NCP), Yangtze River Delta (YRD) and Pearl (PRD) regions, but remain poorly characterized Guizhou located east Yunnan-Guizhou Plateau. Here, we analyzed spatiotemporal variations trends six criteria pollutants, i.e., inhalable particles (PM 10 ), fine particle 2.5 sulfur dioxide (SO 2 carbon monoxide (CO), nitrogen (NO ) ozone (O 3 from 2016 2020 focus major cities Guizhou, taking advantage extensive network data available since 2016. The annual mean concentrations were substantially lower than China’s national ambient quality standard (NAAQS-II), confirmed significant improvement Guizhou. PM , SO CO NO all decreased year by during 2016–2020 cities, highest decrease occurred fall or winter. By contrast, O increased with rate ranged 0.85 μg·m −3 yr −1 (95% CI: 0∼1.78) 3.71 2.54∼5.13), increase spring summer, revealing strong impetus for reducing pollution. Correlations among unveiled that correlation coefficients between higher those most mirroring priority control x reduce pollution curbing should be redesigned mitigate multiple precursors sectors, efficient strategies warm seasons also implemented cold seasons. Our results will benefit knowledge about current situation police makers future