污染气体排放
/pəlˈuːtɪŋ ˈɡas ɪmˈɪʃən/
n
English: polluting gas emission · 污染气体排放
English · polluting gas emissionEspañol · emisión de gases contaminantesFrançais · émission de gaz polluants
释义：Most polluting gases are present in the atmosphere in minuscule quantities, but human activity increases their concentration.