Question

According to the central pollution control Board particles that are responsible for causing great harm to human health are of diameter ________________.

• A. 2.50 micrometers
• B. 5.00 micrometers
• C. 10.00 micrometers
• D. 7.5 micrometers

Answer 1

Answer: (A)

2.50 micrometers

• Particulate matter causing air pollution is differentiated into settleable (larger than $10$ ) and suspended (less than $10$ ) particulate matter.
• According to the Central Pollution Control Board, particles of $2.5$ and lesser diameter are most harmful to human health as they can pass deep into the lungs causing breathing and respiratory problems.