Extended Data Fig. 10: Comparison of the changes between PM2.5 chemical composition concentrations and their precursor emissions during 2013–2020.
From: Efficacy of China’s clean air actions to tackle PM2.5 pollution between 2013 and 2020
Comparison between (a) SO2 emissions and sulfate concentrations, (b) NOx emissions and nitrate concentrations, (c) NH3 emissions and ammonium concentrations, and (d) BC emissions and BC concentrations. PM2.5 chemical composition concentrations are national population-weighted mean excluding the impacts from changes in meteorological conditions. All data are percent changes relative to the value in 2013. The shades of the symbols’ colors denote the year.
