Datagov Opendata Platform

This document is based on the monitoring results of the general automatic air quality monitoring stations set up by the Environmental Protection Administration. According to the statistics of the whole country and counties, the concentrations of seven pollutants, including ozone (O3), fine particulate matter (PM2.5), particulate matter (PM10), carbon monoxide (CO), sulfur dioxide (SO2), and nitrogen dioxide (NO2) in the air are calculated using segmented linear equations to obtain the AQI index value for each monitoring station on a given day. The number of days and the ratio of days with AQI 100 are classified according to the impact on human health.