Multiple choice

Air pollution means:

  1. mixing of various gases

  2. water droplets in the air

  3. presence of undesirable elements in the air

  4. all of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Air pollution refers to the presence of harmful or undesirable substances in the atmosphere. These include particulates, gases, and biological molecules that can harm health or the environment.

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