Extended Data Fig. 5: Spatial distribution of PM2.5 emissions, RPAE, and RP of PM2.5 emissions in China in 2021.
From: Control of toxicity of fine particulate matter emissions in China

a, PM2.5 emissions (resolution: 9 km × 9 km). b, RPAECT. c, RPCT of PM2.5. The bold boundaries denote the Beijing-Tianjin-Hebei (BTH) region, Yangtze River Delta (YRD), Pearl River Delta (PRD), and Northwestern China (Northwest). The base map is from the Standard Map Service System hosted by the Ministry of Natural Resources of China.