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