Definition: Particulate matter concentrations refers to tus nqi ntawm cov khoom zoo hauv huab cua. Cov khoom me me (PM2. 5) yog qhov me me, ntsuas tsawg dua 2.5 microns lossis 1/25 qhov dav ntawm tib neeg cov plaub hau - tseem ua rau muaj kev pheej hmoo loj rau kev noj qab haus huv thaum nqus tau.
Koj pom qhov concentration ntawm cov teeb meem li cas?
PM2 txhua hnub. 5/PM10 AQI yog xam los ntawm noj 24-teev concentration nruab nrab ntawm ib tag hmo mus rau ib tag hmo (Local Standard Time) thiab hloov mus rau AQI. 75%, lossis 18/24 teev cov ntaub ntawv xav tau rau kev suav AQI txhua hnub.
Yuav ua li cas yog tias qhov concentration ntawm cov teeb meem hauv huab cua siab?
raug rau cov khoom no tuaj yeem cuam tshuam rau koj lub ntsws thiab koj lub siab. Ntau qhov kev tshawb fawb tshawb fawb tau txuas cov kab mob ua paug rau ntau yam teeb meem, suav nrog: tuag ntxov rau cov neeg mob plawv lossis mob ntsws . tsis mob plawv.
Dab tsi yog qhov concentration ntawm PM2 5?
PM2. 5 yog hais txog atmospheric particulate matter (PM) uas muaj txoj kab uas hla tsawg dua 2.5 micrometers, uas yog hais txog 3% txoj kab uas hla ntawm tib neeg cov plaub hau . Feem ntau sau ua PM2.5, hais nyob rau hauv pawg no tsawg heev uas lawv tsuas pom tau nrog lub tshuab tsom.
qib PM nyab xeeb yog dab tsi?
Hauv Teb Chaws Asmeskas, raug rau cov teeb meem zoo heev hu ua PM2. 5 yog suav tias yog kev nyab xeeb los ntawmUS Environmental Protection Agency lub teb chaws ambient huab cua zoo raws li ib tug neeg ua pa nyob rau hauv qhov nruab nrab ntawm 12 micrograms ib cubic meter ntawm huab cua (μg / m3) los yog tsawg dua ib hnub nyob rau hauv lub sij hawm ntawm ib xyoo.
