環境保護部(bu)有關負責(ze)人近日向媒體發布了2014年5月(yue)份京津冀、長三(san)角、珠三(san)角區域及直轄市、省會城(cheng)市和計劃(hua)單列市等74個城(cheng)市空氣(qi)質量狀況。

這位(wei)負責人(ren)介紹說(shuo)，5月(yue)份，74個城(cheng)(cheng)(cheng)(cheng)(cheng)市(shi)(shi)空氣(qi)(qi)質(zhi)量平(ping)均達標(biao)天(tian)(tian)數(shu)(shu)(shu)(shu)比(bi)(bi)(bi)(bi)例(li)(li)為(wei)66.3%，平(ping)均超標(biao)天(tian)(tian)數(shu)(shu)(shu)(shu)比(bi)(bi)(bi)(bi)例(li)(li)為(wei)33.7%，其(qi)中(zhong)輕度(du)污(wu)(wu)(wu)(wu)染(ran)(ran)占24.7%，中(zhong)度(du)污(wu)(wu)(wu)(wu)染(ran)(ran)占7.5%，重(zhong)度(du)污(wu)(wu)(wu)(wu)染(ran)(ran)占1.4%，嚴重(zhong)污(wu)(wu)(wu)(wu)染(ran)(ran)占0.1%。海(hai)口、深圳(zhen)、南(nan)寧(ning)等8個城(cheng)(cheng)(cheng)(cheng)(cheng)市(shi)(shi)的(de)達標(biao)天(tian)(tian)數(shu)(shu)(shu)(shu)比(bi)(bi)(bi)(bi)例(li)(li)為(wei)100%，重(zhong)慶、廈門、廣州等18個城(cheng)(cheng)(cheng)(cheng)(cheng)市(shi)(shi)的(de)達標(biao)天(tian)(tian)數(shu)(shu)(shu)(shu)比(bi)(bi)(bi)(bi)例(li)(li)在80%以(yi)上(shang)(shang)，臺(tai)州、張家口、溫(wen)州等28個城(cheng)(cheng)(cheng)(cheng)(cheng)市(shi)(shi)達標(biao)天(tian)(tian)數(shu)(shu)(shu)(shu)比(bi)(bi)(bi)(bi)例(li)(li)范圍為(wei)50%～80%，南(nan)京(jing)(jing)、邢臺(tai)、邯鄲等20個城(cheng)(cheng)(cheng)(cheng)(cheng)市(shi)(shi)達標(biao)天(tian)(tian)數(shu)(shu)(shu)(shu)比(bi)(bi)(bi)(bi)例(li)(li)不足50%。超標(biao)天(tian)(tian)數(shu)(shu)(shu)(shu)中(zhong)以(yi)PM2.5為(wei)首要(yao)污(wu)(wu)(wu)(wu)染(ran)(ran)物的(de)天(tian)(tian)數(shu)(shu)(shu)(shu)最多，占超標(biao)天(tian)(tian)數(shu)(shu)(shu)(shu)的(de)33.9%；其(qi)次(ci)是PM10和(he)O3，分(fen)別占33.7%和(he)31.7%。按(an)照城(cheng)(cheng)(cheng)(cheng)(cheng)市(shi)(shi)環境空氣(qi)(qi)質(zhi)量綜(zong)合指數(shu)(shu)(shu)(shu)評價(jia)，5月(yue)份空氣(qi)(qi)質(zhi)量相(xiang)對(dui)較差的(de)前10位(wei)城(cheng)(cheng)(cheng)(cheng)(cheng)市(shi)(shi)分(fen)別是邢臺(tai)、唐山、南(nan)京(jing)(jing)、邯鄲、石家莊、衡水、常州、濟南(nan)、鎮江(jiang)和(he)保定；空氣(qi)(qi)質(zhi)量相(xiang)對(dui)較好的(de)前10位(wei)城(cheng)(cheng)(cheng)(cheng)(cheng)市(shi)(shi)是海(hai)口、珠海(hai)、中(zhong)山、深圳(zhen)、江(jiang)門、惠州、東(dong)莞、拉薩、哈爾濱和(he)南(nan)寧(ning)。從(cong)達標(biao)天(tian)(tian)數(shu)(shu)(shu)(shu)比(bi)(bi)(bi)(bi)例(li)(li)來(lai)看，5月(yue)份與上(shang)(shang)年同(tong)期和(he)4月(yue)相(xiang)比(bi)(bi)(bi)(bi)有(you)所(suo)下降(jiang)，但重(zhong)度(du)及以(yi)上(shang)(shang)污(wu)(wu)(wu)(wu)染(ran)(ran)天(tian)(tian)數(shu)(shu)(shu)(shu)比(bi)(bi)(bi)(bi)例(li)(li)也有(you)所(suo)降(jiang)低。從(cong)城(cheng)(cheng)(cheng)(cheng)(cheng)市(shi)(shi)空氣(qi)(qi)質(zhi)量變化(hua)來(lai)看，受(shou)光照增強、氣(qi)(qi)溫(wen)升(sheng)高、秸稈(gan)焚燒等原(yuan)因(yin)的(de)影(ying)響，長三角地區(qu)的(de)南(nan)京(jing)(jing)、常州、鎮江(jiang)等城(cheng)(cheng)(cheng)(cheng)(cheng)市(shi)(shi)空氣(qi)(qi)質(zhi)量較4月(yue)明(ming)顯(xian)下降(jiang)。從(cong)主要(yao)污(wu)(wu)(wu)(wu)染(ran)(ran)物狀況來(lai)看，與上(shang)(shang)年同(tong)期和(he)4月(yue)相(xiang)比(bi)(bi)(bi)(bi)，5月(yue)份PM2.5、SO2、NO2等主要(yao)污(wu)(wu)(wu)(wu)染(ran)(ran)物濃度(du)均有(you)所(suo)降(jiang)低，PM10、O3有(you)所(suo)升(sheng)高或持(chi)平(ping)，CO相(xiang)對(dui)穩定。

京(jing)津冀地區(qu)13個城市空氣質量(liang)平(ping)均達標(biao)(biao)天(tian)(tian)數比例(li)(li)為43.5%，與上(shang)(shang)年同期相(xiang)比提(ti)高(gao)10.2個百分點，與4月(yue)相(xiang)比提(ti)高(gao)8.7個百分點；平(ping)均超(chao)標(biao)(biao)天(tian)(tian)數比例(li)(li)為56.5%，其中重度(du)污染天(tian)(tian)數比例(li)(li)為3.3%，無嚴重污染天(tian)(tian)數。超(chao)標(biao)(biao)天(tian)(tian)數中以PM10為首要污染物的(de)天(tian)(tian)數最多，占(zhan)超(chao)標(biao)(biao)天(tian)(tian)數的(de)43.5%；其次(ci)是O3和PM2.5，分別(bie)占(zhan)32.7%和23.8%。與上(shang)(shang)年同期和4月(yue)相(xiang)比，5月(yue)份京(jing)津冀地區(qu)13個城市平(ping)均達標(biao)(biao)天(tian)(tian)數比例(li)(li)有(you)(you)(you)所(suo)(suo)上(shang)(shang)升，PM2.5、PM10、SO2和NO2月(yue)均濃度(du)均有(you)(you)(you)所(suo)(suo)下降，空氣質量(liang)有(you)(you)(you)所(suo)(suo)改善。

 長三角地(di)區25個城市空(kong)氣質量(liang)平(ping)均達(da)標天(tian)(tian)數(shu)(shu)(shu)比例為(wei)(wei)58.0%，與(yu)上年同(tong)期相比降(jiang)低15.9個百分點，與(yu)4月(yue)相比降(jiang)低20.2個百分點；平(ping)均超(chao)標天(tian)(tian)數(shu)(shu)(shu)比例為(wei)(wei)42.0%，其中重(zhong)度(du)污染比例為(wei)(wei)1.4%，無嚴重(zhong)污染。超(chao)標天(tian)(tian)數(shu)(shu)(shu)中以PM2.5為(wei)(wei)首(shou)要污染物的天(tian)(tian)數(shu)(shu)(shu)最多，占超(chao)標天(tian)(tian)數(shu)(shu)(shu)的44.0%；其次是O3，占41.4%。與(yu)上年同(tong)期和4月(yue)相比，5月(yue)份長三角地(di)區25個城市平(ping)均達(da)標天(tian)(tian)數(shu)(shu)(shu)比例有所(suo)下(xia)(xia)降(jiang)，主(zhu)要污染物除CO持平(ping)外，PM2.5、PM10、SO2、NO2、O3等污染狀況均有所(suo)加重(zhong)，空(kong)氣質量(liang)有所(suo)下(xia)(xia)降(jiang)。

珠(zhu)(zhu)三角(jiao)地區9個(ge)(ge)城(cheng)市(shi)空(kong)(kong)氣質量平(ping)均達標(biao)(biao)天數(shu)(shu)(shu)比(bi)例為96.2%，與上年同(tong)期(qi)相比(bi)降低0.9個(ge)(ge)百分(fen)點，與4月(yue)相比(bi)提高(gao)3.2個(ge)(ge)百分(fen)點；平(ping)均超標(biao)(biao)天數(shu)(shu)(shu)比(bi)例為3.8%，無重度污(wu)染及以(yi)上污(wu)染。超標(biao)(biao)天數(shu)(shu)(shu)以(yi)O3為首(shou)要(yao)污(wu)染物的天數(shu)(shu)(shu)最多，占超標(biao)(biao)天數(shu)(shu)(shu)的70.0%；其次是(shi)NO2，占20.0%。與上年同(tong)期(qi)和4月(yue)相比(bi)，5月(yue)份珠(zhu)(zhu)三角(jiao)地區9個(ge)(ge)城(cheng)市(shi)主要(yao)污(wu)染物除(chu)CO持平(ping)外，PM2.5、PM10、SO2和NO2月(yue)均濃度均有(you)所(suo)下(xia)降，空(kong)(kong)氣質量有(you)所(suo)改(gai)善。

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