空氣質量污染等級怎么劃分呢，劃分之后對環境保護又能起到什么作用呢，為什么環保局會要求安裝油煙凈化器呢

張(zhang)店區(qu)(qu)要求，如遇有Ⅰ級污(wu)染天(tian)，各鎮、街道(dao)辦事處須組織(zhi)轄區(qu)(qu)內重點企事業(ye)單位，每1小(xiao)(xiao)時對廠區(qu)(qu)及(ji)道(dao)路實施一次(ci)灑水降塵；在1小(xiao)(xiao)時內完(wan)成轄區(qu)(qu)內建設工(gong)地(di)、道(dao)路交通(tong)工(gong)地(di)、拆除工(gong)地(di)等施工(gong)工(gong)地(di)現場(chang)檢查(cha)(cha)；兩小(xiao)(xiao)時內完(wan)成轄區(qu)(qu)內大氣(qi)污(wu)染情況巡查(cha)(cha)，對涉氣(qi)企業(ye)進行(xing)重點檢查(cha)(cha)和監測(ce)，嚴格查(cha)(cha)處違法排污(wu)企業(ye)；通(tong)報(bao)污(wu)染原因，協同(tong)媒體加大宣傳力度，鼓勵(li)市民(min)綠(lv)色出(chu)行(xing)，自(zi)覺減少大氣(qi)污(wu)染物排放。

為加強(qiang)對(dui)(dui)建筑工(gong)(gong)地(di)揚(yang)塵的(de)(de)監督(du)管(guan)理，他們規定，遇Ⅰ級污染天時(shi)(shi)，要在1小時(shi)(shi)內派出(chu)督(du)察(cha)組對(dui)(dui)建筑工(gong)(gong)地(di)揚(yang)塵防(fang)治(zhi)工(gong)(gong)作(zuo)情況(kuang)進行(xing)督(du)察(cha)，落實建筑工(gong)(gong)地(di)停(ting)止土方施工(gong)(gong)、渣(zha)土外運及全場濕化工(gong)(gong)作(zuo)。3小時(shi)(shi)內完成全區(qu)空氣污染重(zhong)(zhong)點企業(ye)的(de)(de)壓產(chan)、限(xian)排工(gong)(gong)作(zuo)。3小時(shi)(shi)內對(dui)(dui)重(zhong)(zhong)點區(qu)域實行(xing)臨時(shi)(shi)交(jiao)(jiao)通(tong)(tong)管(guan)控，采取遠端分流、計(ji)劃放行(xing)的(de)(de)方式，控制交(jiao)(jiao)通(tong)(tong)流量(liang)。

　　預案(an)對四級(ji)空(kong)氣(qi)污(wu)染都做出(chu)了有針對性的預案(an)措施，有污(wu)染天時(shi)(shi)將根據空(kong)氣(qi)質量監測情況(kuang)，適時(shi)(shi)發布預案(an)解(jie)除或升級(ji)命令，確保中心(xin)城區環境質量

氣(qi)質量污染(ran)等級(ji)分為四級(ji)。其中，空(kong)氣(qi)污染(ran)預(yu)(yu)(yu)測指(zhi)(zhi)數(API)達到101～150時(shi)，啟(qi)(qi)(qi)動Ⅳ級(ji)預(yu)(yu)(yu)案(an)；空(kong)氣(qi)污染(ran)預(yu)(yu)(yu)測指(zhi)(zhi)數(API)達到151～200時(shi)，啟(qi)(qi)(qi)動Ⅲ級(ji)預(yu)(yu)(yu)案(an)；空(kong)氣(qi)污染(ran)預(yu)(yu)(yu)測指(zhi)(zhi)數(API)達到201～300時(shi)，啟(qi)(qi)(qi)動Ⅱ級(ji)預(yu)(yu)(yu)案(an)；空(kong)氣(qi)污染(ran)預(yu)(yu)(yu)測指(zhi)(zhi)數(API)達到301以上時(shi)，啟(qi)(qi)(qi)動Ⅰ級(ji)預(yu)(yu)(yu)案(an)