Multiple choice

Smog, which reduces the visibility and leads to accidents, consists of

  1. fire and water

  2. smoke and fog

  3. water and smoke

  4. air and water

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The word 'smog' is a portmanteau of 'smoke' and 'fog'. It is a type of intense air pollution that occurs when smoke particles mix with water vapor in the air.