PM stands for particulate matter (tseem hu ua particle pollution): lub sij hawm rau kev sib xyaw ntawm cov khoom sib xyaw thiab cov kua dej hauv cov huab cua. Qee qhov, xws li plua plav, av, av, los yog pa luam yeeb, loj lossis tsaus txaus kom pom ntawm qhov muag liab qab.
PM 2.5 yog dab tsi thiab yog vim li cas thiaj txaus ntshai?
Particles in the PM2.5 qhov loj yog mus tob rau hauv txoj hlab pa, ncav cuag lub ntsws. Kev raug cov khoom zoo tuaj yeem ua rau muaj kev cuam tshuam rau lub sijhawm luv luv xws li qhov muag, qhov ntswg, caj pas thiab lub ntsws ua xua, hnoos, txham, los ntswg qhov ntswg thiab ua tsis taus pa.
Dab tsi yog qhov piv txwv piv txwv?
Particulate teeb meem yog qhov suav ntawm tag nrho cov khoom thiab cov khoom ua kua raug tshem tawm hauv huab cua ntau yam uas muaj kev phom sij. Qhov sib xyaw ua ke no suav nrog ob qho tib si organic thiab inorganic hais, xws li plua plav, paj ntoos, soot, pa luam yeeb, thiab kua dej.
SPM yog dab tsi?
Suspended particulate matter (SPM) yog muab faib ua cov khib nyiab los yog cov kua dej uas yuav raug xa tawm los ntawm huab cua los ntawm cov txheej txheem combustion, kev lag luam kev lag luam lossis qhov chaw ntuj.
PM 2.5 thiab PM 10 yog dab tsi?
Definition. Particulate matter (PM) suav nrog cov teeb meem microscopic tshem tawm hauv huab cua lossis dej. Cov kab mob hauv cov huab cua yog hu ua aerosols. PM10 suav nrog cov khoom tsawg dua 10 µm inch, PM2. 5 qhov tsawg dua 2.5 µm.
