Question

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

Answer 1

The correct option is A 2.5 or less

Particulate air pollutant like soot, fly ash, dust of various types, pollens, spores, fur, hair can be differentiated as settable and suspended particulate matter pollutant. Their effect on the environment depends upon the size of the particles. According to CPCB, particulate matter of 2.5 micrometres or less in diameter are responsible for causing great harm to human health. They are inhaled deep into the respiratory tract upto lungs and causes respiratory problems and may even lead to death

So, the correct answer is '2.5 or less'