2020中國生態環(huan)境狀況公報顯示，2020年(nian)全(quan)國337個地級及以上(shang)的城市(shi)(shi)(shi)中，有202個城市(shi)(shi)(shi)環(huan)境空(kong)氣質量達標(biao)，達標(biao)率占(zhan)全(quan)部城市(shi)(shi)(shi)的59.9%，同比2019年(nian)增長了13.3個百分(fen)點。此外(wai)還有135個城市(shi)(shi)(shi)環(huan)境空(kong)氣質量超標(biao)，超標(biao)率占(zhan)40.1%。

從各大(da)城(cheng)(cheng)(cheng)市(shi)平均(jun)優(you)良(liang)天(tian)數(shu)(shu)比(bi)(bi)例來看，中國(guo)環(huan)境質量城(cheng)(cheng)(cheng)市(shi)排行(xing)榜中有17個(ge)(ge)城(cheng)(cheng)(cheng)市(shi)優(you)良(liang)天(tian)數(shu)(shu)比(bi)(bi)例為100%，243個(ge)(ge)城(cheng)(cheng)(cheng)市(shi)優(you)良(liang)天(tian)數(shu)(shu)比(bi)(bi)例在(zai)80%~100%之間，74個(ge)(ge)城(cheng)(cheng)(cheng)市(shi)優(you)良(liang)天(tian)數(shu)(shu)比(bi)(bi)例在(zai)50%~80%之間，3個(ge)(ge)城(cheng)(cheng)(cheng)市(shi)優(you)良(liang)天(tian)數(shu)(shu)比(bi)(bi)例低于50%。

從污(wu)染程度來看，全國337個城市(shi)累計發(fa)生嚴重污(wu)染345天(tian)(tian)，同比上年(nian)減少107天(tian)(tian)；重度污(wu)染1152天(tian)(tian)，同比上年(nian)減少514天(tian)(tian)。