Question

According to Central Pollution Control Board, air pollutants responsible for great harm have a size(in $\mu$m) of

• A. $1.0$ or less
• B. $1.5$ or less
• C. $2.5$ or less
• D. $5.2-2.5$

Answer 1

Answer: (C)

$2.5$ or less

Particulate air pollutants are tiny particles or materials suspended in the atmosphere. These can be solids or liquid droplets.

According to Central Pollution Control Board (CPCB), Particulate matter having size 2.5 μm or less in diameter, are responsible for causing serious health hazards such as respiratory symptoms, irritations, damage to lungs, inflammations and even premature death.

So, the correct answer is '2.5 or less'.