Air pollution China 2 Air pollution control 1 Chinese cities 1 Driving factors 1 Driving factors analysis 1 Economic and social effects 1 Economics 1 Energy utilization 1 FeNO 1 Fine particulate matter 1 Health 1 Health risks 1 Indicator indicator 1 PM 1 PM2.5 1 PM2.5 health risk 1 PM2.5 health risks 1 Panel study 1 Regression analysis 1 STIRRAT model 1 Spatio-temporal variation 1 Sustainable development 1 Temporal variation type 1 University students 1 Variation factor 1 action plan 1 annual variation 1 concentration (composition) 1 economic development 1