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　　北??(bei)京??(jing)市??(shi)生??(sheng)態(tài)??(tai)環(huán)??(huan)境??(jing)監(jiān)??(jian)測??(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??(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??(shi)濃??(nong)度??(du)達(dá)??(da)到??(dao)500微??(wei)克??(ke)/立祝(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??(shi)濃??(nong)度??(du)處??(chu)于??(yu)3級??(ji)輕??(qing)度??(du)污??(wu)染?(ran)水??(shui)平??(ping)??。??受??(shou)外?(wai)來??(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??(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??(ji)輕??(qing)度??(du)污??(wu)染??(ran)水??(shui)平??(ping)??。　　預(yù)??(yu)計??(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?(lai)沙??(sha)塵??(chen)天??(tian)氣??(qi)影??(ying)響??(xiang)??，PM10以??(yi)3級??(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??(ji)外??(wai)來??(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??(ji)可??(ke)達(dá)??(da)到??(dao)3-4級??(ji)輕??(qing)中??(zhong)度??(du)污??(wu)染??(ran)水??(shui)平?(ping)??，峰??(feng)值??(zhi)時?(shi)段??(duan)可??(ke)達(dá)??(da)到??(dao)4-5級??(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??(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??(ji)可??(ke)逐??(zhu)步??(bu)降??(jiang)至?(zhi)2級??(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??(xian)??，預(yù)??(yu)計??(ji)PM10可??(ke)達(dá)??(da)到??(dao)2-3級??(ji)良??(liang)至??(zhi)輕?(qing)度?(du)污??(wu)染??(ran)水??(shui)平??(ping)?。。