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　　預(yù)?(yu)計(jì)??(ji)今??(jin)天??(tian)白??(bai)天??(tian)??，京??(jing)城??(cheng)將??(jiang)持??(chi)續(xù)??(xu)受??(shou)到??(dao)外??(wai)來(lái)??(lai)沙??(sha)塵??(chen)天??(tian)氣??(qi)影??(ying)響??(xiang)??，PM10以??(yi)3級(jí)??(ji)輕??(qing)度??(du)污??(wu)染??(ran)為??(wei)主??(zhu)；傍??(bang)晚??(wan)至??(zhi)前??(qian)半??(ban)夜??(ye)??，預(yù)??(yu)計(jì)??(ji)外??(wai)來(lái)??(lai)沙??(sha)塵??(chen)傳??(chuan)輸??(shu)影??(ying)響??(xiang)加??(jia)大??(da)??，本??(ben)市??(shi)PM10濃??(nong)度??(du)明??(ming)顯??(xian)上??(shang)升??(sheng)??，預(yù)??(yu)計(jì)??(ji)可?(ke)達(dá)??(da)到??(dao)3-4級(jí)??(ji)輕??(qing)中??(zhong)度??(du)污??(wu)染??(ran)水??(shui)平??(ping)??，峰??(feng)值??(zhi)時(shí)??(shi)段??(duan)可??(ke)達(dá)??(da)到??(dao)4-5級(jí)??(ji)中??(zhong)重??(zhong)度??(du)污??(wu)染??(ran)??。??24日??(ri)凌??(ling)晨??(chen)至??(zhi)上??(shang)午??(wu)??，轉(zhuǎn)??(zhuan)冷??(leng)高??(gao)壓??(ya)偏??(pian)北?(bei)風(fēng)??(feng)??，預(yù)??(yu)計(jì)??(ji)沙??(sha)塵??(chen)影??(ying)響??(xiang)有??(you)所??(suo)減??(jian)弱??(ruo)??，PM10濃??(nong)度?(du)預(yù)??(yu)計(jì)??(ji)可??(ke)逐??(zhu)步??(bu)降??(jiang)至??(zhi)2級(jí)??(ji)良??(liang)水??(shui)平??(ping)；24日??(ri)下??(xia)午??(wu)至?(zhi)夜??(ye)間??(jian)??，京??(jing)津??(jin)冀??(ji)區(qū)??(qu)域??(yu)地?(di)面??(mian)轉(zhuǎn)??(zhuan)持?(chi)續(xù)??(xu)偏??(pian)東??(dong)南??(nan)風(fēng)??(feng)??，存??(cun)在?(zai)沙?(sha)塵??(chen)污?(wu)染??(ran)回??(hui)流??(liu)風(fēng)??(feng)險(xiǎn)??(xian)??，預(yù)??(yu)計(jì)??(ji)PM10可??(ke)達(dá)??(da)到??(dao)2-3級(jí)??(ji)良?(liang)至??(zhi)輕??(qing)度??(du)污??(wu)染??(ran)水??(shui)平??(ping)???！　”??(bei)京??(jing)市秘(shi)生??(sheng)態(tài)??(tai)環(huán)??(huan)境??(jing)監(jiān)??(jian)測(cè)??(ce)中??(zhong)心??(xin)介??(jie)紹??(shao)??，受??(shou)強(qiáng)??(qiang)低??(di)壓??(ya)氣??(qi)旋??(xuan)系??(xi)統(tǒng)??(tong)影??(ying)響??(xiang)??，23日??(ri)白??(bai)天?(tian)??，我??(wo)國(guó)??(guo)西?(xi)北??(bei)地??(di)區(qū)??(qu)出?(chu)現(xiàn)??(xian)大??(da)范?(fan)圍??(wei)沙??(sha)塵??(chen)天??(tian)氣??(qi)??，上??(shang)午??(wu)內(nèi)??(nei)蒙??(meng)古??(gu)中??(zhong)部??(bu)地??(di)區(qū)??(qu)部??(bu)分??(fen)城??(cheng)市??(shi)PM10小??(xiao)時(shí)??(shi)濃??(nong)度??(du)達(dá)?(da)到??(dao)500微??(wei)克??(ke)/立??(li)方??(fang)米??(mi)左??(zuo)右??(you)??，為??(wei)嚴(yán)??(yan)重??(zhong)污??(wu)染??(ran)水??(shui)平??(ping)；山??(shan)西??(xi)河??(he)北??(bei)北?(bei)部??(bu)PM10小??(xiao)時(shí)??(shi)濃?(nong)度??(du)處?(chu)于?(yu)3級(jí)??(ji)輕??(qing)度??(du)污??(wu)染??(ran)水??(shui)平??(ping)??。??受?(shou)外??(wai)來(lái)??(lai)沙??(sha)塵??(chen)傳??(chuan)輸??(shu)影??(ying)響??(xiang)??，北??(bei)京??(jing)PM10濃??(nong)度??(du)持??(chi)續(xù)?(xu)上?(shang)升??(sheng)??，10時(shí)??(shi)PM10濃??(nong)度??(du)達(dá)?(da)到??(dao)152微??(wei)克??(ke)/立??(li)方??(fang)米??(mi)??，為??(wei)3級(jí)??(ji)輕??(qing)度??(du)污??(wu)染??(ran)水??(shui)平??(ping)??。。