Like any big city, the pollutants comes from the 2 million+ peoples living and working in the city. It comes from the cars, trucks, buses, airplanes (airport), industries, restaurants, etc, etc.
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The "progressive" tense of a verb in English uses the present or future of the verb to be with the present participle of the verb in question, so that we could say "is polluting," or "will be polluting." The present participle with the past tenses of to be forms a kind of progressive imperfect: "was polluting, has been polluting, had been polluting."
Radiation is in the middle of being Polluing and Non-Polluting
montral
not even close polluting causes globle warming
it is not
David Lipper was born in Montral, in Canada.
there are many gases polluting the Earth but the main 2 are oxygen and carbon dioxide.
water pollution: polluting water air pollution: polluting air
"Are polluting" is a verb phrase because it consists of a main verb "polluting" preceded by the helping verb "are." Together, they function as the predicate in a sentence, indicating the action being performed.
Polluting, cows are one of the major contributors of greenhouse gases
The highest concentration of non polluting ozone is in stratosphere. It is present in atmosphere.