This data is based on the monitoring results of the ambient air quality monitoring stations set up by the Environmental Protection Administraion of the Executive Yuan. According to national and municipal statistics, this data calculates the concentration of pollutants, including fine suspended particles (PM2.5), suspended particles (PM10), sulfur dioxide (SO2), carbon monoxide (CO), and nitrogen dioxide (NO2), and ozone (O3). And compiling the concentration of total suspended particulates (TSP) in the air reported by the local monitoring stations set up by local environmental protection bureaus. Among them, the ozone (O3) concentration value was calculated by the arithmetic average of the maximum effective hour value of each day, and the remaining pollutants were all calculated by the average value.