M'mbuyomu, ndi nyengo ya chifunga yosalekeza m'madera ambiri a dziko, "PM2.5" yakhala mawu otentha kwambiri mu sayansi yotchuka.Chifukwa chachikulu cha "kuphulika" kwa mtengo wa PM2.5 nthawi ino ndi mpweya waukulu wa sulfure dioxide, nitrogen oxides ndi fumbi lopangidwa ndi malasha.Monga mmodzi wa...
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