Yog tias huab cua zoo nyob rau thaj chaw thaj chaw sib ntsib lossis huv dua li lub teb chaws tus qauv, nws yog hu ua thaj chaw attainment (tsim "tau txais / tsis tuaj yeem"); thaj chaw uas tsis tau raws li lub teb chaws tus qauv hu ua nonattainment area.
Astainment txhais li cas hauv huab cua zoo?
"Attainment" xwm txheej rau cov pa phem txhais tau hais tias Lub Nroog Cua tau ua raws li tus qauv tsim los ntawm US Environmental Protection Agency (tsoom fwv) lossis California Environmental Protection Agency (xeev). Kev saib xyuas huab cua tsis tu ncua ua kom ntseeg tau tias cov qauv no tau ua tiav thiab khaws cia.
Cov txheej txheem rau huab cua paug hauv thaj chaw ua tiav yog dab tsi?
Cov pa phem no, hu ua "cov txheej txheem" cov pa phem, yogcarbon monoxide, txhuas, nitrogen dioxide, ozone, cov khoom me me, sulfur dioxide.
6 yam kev ua pa phem yog dab tsi?
EPA tau tsim lub teb chaws ambient huab cua zoo qauv (NAAQS) rau rau ntawm cov pa phem tshaj plaws- carbon monoxide, txhuas, av-theem ozone, cov khoom me me, nitrogen dioxide, thiab sulfur dioxide -paub tias yog "cov qauv" cov pa phem (lossis "cov pa phem").
7 yam kev ua pa phem yog dab tsi?
Cov txheej txheem huab cua muaj kuab paug muaj xws li cov pa phem, ozone hauv av, carbon monoxide, sulfur dioxide, nitrogen dioxide, thiab txhuas. Cov pa phem no tuaj yeem tsim kev puas tsuaj rau koj kev noj qab haus huv thiab ib puag ncig, thiab ua rau muaj vaj tsepuas.
