天津(jin)市(shi)環保(bao)局今日公(gong)布全市(shi)2017年(nian)(nian)(nian)環境空氣(qi)質量狀(zhuang)況(kuang)及2013年(nian)(nian)(nian)~2017年(nian)(nian)(nian)環境空氣(qi)質量變化情況(kuang)。2017年(nian)(nian)(nian)，天津(jin)市(shi)PM2.5年(nian)(nian)(nian)均濃(nong)度62微克(ke)/立方米，同比下降(jiang)10.1%，與2013年(nian)(nian)(nian)相(xiang)比，下降(jiang)35.4%，完成國(guo)家《大氣(qi)污(wu)染防(fang)治行(xing)動計劃》任務目標。  

具體(ti)看(kan)，2017年(nian)，天(tian)津市環境空氣質量綜合指數(shu)6.53，同(tong)比下(xia)降1.8%，達(da)標(biao)天(tian)數(shu)209天(tian)，重污染(ran)天(tian)數(shu)23天(tian)，同(tong)比減少(shao)6天(tian)，PM2.5年(nian)均(jun)濃(nong)(nong)(nong)度(du)(du)同(tong)比下(xia)降10.1%。PM2.5、PM10、SO2、NO2年(nian)均(jun)濃(nong)(nong)(nong)度(du)(du)分(fen)別(bie)(bie)為62微克(ke)/立(li)(li)方(fang)米、94微克(ke)/立(li)(li)方(fang)米、16微克(ke)/立(li)(li)方(fang)米、50微克(ke)/立(li)(li)方(fang)米，CO和(he)(he)O3濃(nong)(nong)(nong)度(du)(du)分(fen)別(bie)(bie)為2.8毫(hao)克(ke)/立(li)(li)方(fang)米、192微克(ke)/立(li)(li)方(fang)米。主(zhu)要污染(ran)物中(zhong)，SO2年(nian)均(jun)濃(nong)(nong)(nong)度(du)(du)和(he)(he)CO濃(nong)(nong)(nong)度(du)(du)均(jun)達(da)到國家標(biao)準(zhun)，PM2.5、PM10、NO2年(nian)均(jun)濃(nong)(nong)(nong)度(du)(du)和(he)(he)O3濃(nong)(nong)(nong)度(du)(du)分(fen)別(bie)(bie)超過國家標(biao)準(zhun)0.77倍、0.34倍、0.25倍和(he)(he)0.20倍。  

2013年(nian)~2017年(nian)，天(tian)(tian)(tian)(tian)(tian)(tian)(tian)津市空(kong)氣質量達標(biao)天(tian)(tian)(tian)(tian)(tian)(tian)(tian)數(shu)顯(xian)著增(zeng)加，從(cong)2013年(nian)的(de)145天(tian)(tian)(tian)(tian)(tian)(tian)(tian)增(zeng)至2017年(nian)的(de)209天(tian)(tian)(tian)(tian)(tian)(tian)(tian)，增(zeng)加64天(tian)(tian)(tian)(tian)(tian)(tian)(tian)。其中，一(yi)級優天(tian)(tian)(tian)(tian)(tian)(tian)(tian)數(shu)從(cong)2013年(nian)的(de)6天(tian)(tian)(tian)(tian)(tian)(tian)(tian)增(zeng)至2017年(nian)的(de)24天(tian)(tian)(tian)(tian)(tian)(tian)(tian)，增(zeng)加18天(tian)(tian)(tian)(tian)(tian)(tian)(tian)。全(quan)市空(kong)氣重(zhong)(zhong)污染天(tian)(tian)(tian)(tian)(tian)(tian)(tian)數(shu)明顯(xian)減少，從(cong)2013年(nian)的(de)49天(tian)(tian)(tian)(tian)(tian)(tian)(tian)降至2017年(nian)的(de)23天(tian)(tian)(tian)(tian)(tian)(tian)(tian)，減少26天(tian)(tian)(tian)(tian)(tian)(tian)(tian)，重(zhong)(zhong)污染天(tian)(tian)(tian)(tian)(tian)(tian)(tian)氣發生率明顯(xian)降低。  

與2013年(nian)相比，2017年(nian)天津市(shi)主要污染物年(nian)均濃度(du)均顯著下(xia)(xia)降(jiang)(jiang)(jiang)，PM2.5、PM10、SO2、NO2分別(bie)下(xia)(xia)降(jiang)(jiang)(jiang)35.4%、37.3%、72.9%、7.4%；其(qi)中SO2下(xia)(xia)降(jiang)(jiang)(jiang)幅度(du)最(zui)大，2017年(nian)年(nian)均濃度(du)首次降(jiang)(jiang)(jiang)至(zhi)20微克/立方米以下(xia)(xia)。

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