Q. According to Central Pollution Control Board (CPCB), which particulate size in diameter (in micrometers) of the air pollutants is responsible for greatest harm to human health?
A) 5.2 - 2.5
B) 2.5 or less
C) 1.5 or less
D) 1.0 or less
Explanation
[Solution from source] CPCB identifies particulate matter of 2.5 µm or less (PM2.5) as the most harmful, because these particles are inhaled deep into the lungs and cause breathing problems, inflammation and damage. Larger particles are mostly trapped in the upper respiratory tract. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.