環境(jing)保護部19日發布2016年3月及(ji)第一季(ji)度全國和京津冀(ji)、長三角、珠三角區域及(ji)直轄市、省會城(cheng)(cheng)市、計劃單列市空(kong)氣質量(liang)狀況。總體(ti)來看(kan)，3月份全國地級及(ji)以上城(cheng)(cheng)市空(kong)氣質量(liang)同比(bi)有(you)所下(xia)降，但(dan)第一季(ji)度同比(bi)有(you)所改善(shan)。

3月，全(quan)國338個(ge)地級及以上城市平均(jun)(jun)(jun)優(you)良(liang)(liang)天(tian)(tian)(tian)(tian)數(shu)(shu)比(bi)(bi)例(li)為71.3%，重度(du)及以上污(wu)染天(tian)(tian)(tian)(tian)數(shu)(shu)比(bi)(bi)例(li)為3.5%。與去年同期相比(bi)(bi)，優(you)良(liang)(liang)天(tian)(tian)(tian)(tian)數(shu)(shu)比(bi)(bi)例(li)下降4.0個(ge)百(bai)分(fen)點(dian)，重度(du)及以上污(wu)染天(tian)(tian)(tian)(tian)數(shu)(shu)比(bi)(bi)例(li)上升1.2個(ge)百(bai)分(fen)點(dian)。其中，京津冀區(qu)域(yu)(yu)13個(ge)城市空氣(qi)質量(liang)平均(jun)(jun)(jun)優(you)良(liang)(liang)天(tian)(tian)(tian)(tian)數(shu)(shu)比(bi)(bi)例(li)為51.7%；長(chang)三角區(qu)域(yu)(yu)25個(ge)城市空氣(qi)質量(liang)平均(jun)(jun)(jun)優(you)良(liang)(liang)天(tian)(tian)(tian)(tian)數(shu)(shu)比(bi)(bi)例(li)為72.0%；珠三角區(qu)域(yu)(yu)9個(ge)城市空氣(qi)質量(liang)平均(jun)(jun)(jun)優(you)良(liang)(liang)天(tian)(tian)(tian)(tian)數(shu)(shu)比(bi)(bi)例(li)為89.9%。

2016年(nian)第一季度，全國338個(ge)地級(ji)及以上(shang)(shang)城市(shi)平(ping)均(jun)優(you)良天(tian)(tian)數(shu)(shu)比例為70.1%，優(you)良天(tian)(tian)數(shu)(shu)比例同比上(shang)(shang)升(sheng)6.4個(ge)百分點(dian)，重(zhong)度及以上(shang)(shang)污染天(tian)(tian)數(shu)(shu)比例下降(jiang)0.8個(ge)百分點(dian)。74個(ge)城市(shi)平(ping)均(jun)優(you)良天(tian)(tian)數(shu)(shu)比例為68.4%，同比上(shang)(shang)升(sheng)8.7個(ge)百分點(dian)。人民日報