Fig. 1

Spearman’s correlations between daily concentration of PM2.5 and other pollutants (PM10, CO, NO2, SO2, O3), meteorological condition in SJZ, 2013–2021.

Spearman’s correlations between daily concentration of PM2.5 and other pollutants (PM10, CO, NO2, SO2, O3), meteorological condition in SJZ, 2013–2021.