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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??(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??(da)到?(dao)500微??(wei)克??(ke)/立??(li)方?(fang)米??(mi)左??(zuo)右?(you)??，為??(wei)嚴??(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??(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)??。。