According to the Central Pollution Control Board of India, particulate sizes of diameter ______ micrometres are responsible for causing the greatest harm to human health.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. equal to or less than 2.5.
According to the Central Pollution Control Board (CPCB), particulate matter (PM) with a diameter of 2.5 micrometres or less (PM2.5) poses the greatest health risk. These fine particles can penetrate deep into the lungs and even enter the bloodstream, causing respiratory and cardiovascular issues. PM2.5 is mainly generated from vehicle emissions, industrial processes, and burning of fossil fuels.