Answer:
Components naturally found in air can be considered air pollutants when there is an anomalous concentration of any of them.
When the level of any of the material or gases in air rises above normal, they become pollutants.
The general cause of this is most through anthropogenic sources on earth.
Carbon dioxide can become a pollutant if its concentration is too much in the atmosphere.
This is already leading to global climate change.
There should be some certain percentages of dusts in the air in order to form clouds.
When dusts becomes too much, air quality reduces drastically and this can lead to terrible health challenges.
This can be said of other air component.
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