Based on the air quality monitoring data from 2017 to 2018,temporal and spatial distribution of PM2.5 and PM10 in the atmosphere was analyzed in Changsha city.The results show that PM2.5 and PM10concentrations in Changsha city took on winter>autumn>spring>summer,and the highest concentration appeared in winter,PM2.5 and PM10 are respectively 62.87 and 89.22μg·m-3.Spatial variation characteristics:PM2.5 concentration is Changsha city>Changsha county>Ningxiang county>Wangcheng district>Liuyang city;PM10 concentration is Changsha city>Ningxiang ...