Multiple choice

Which type of particle pollution (PM) is worse?

  1. PM 10

  2. PM 7.5

  3. PM 5

  4. PM 2.5
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

PM 2.5 refers to fine particles that are 2.5 micrometers or smaller in diameter. Because they are smaller, they can penetrate deeper into the lungs and enter the bloodstream more easily than larger particles like PM 10.

Keep practicing — related questions