Q.2 According to the Central Pollution Control Board, particles that are responsible for causing great harm to human health are of a diameter
1. 2.50 micrometers
2. 5.00 micrometers
3. 10.00 micrometers
4. 7.5 micrometers
Ans. (a) Particulate air pollutants like soot, fly ash, the dust of various types, pollens, spores, fur, hair, etc., can be differentiated as settable (10t m or more) and suspended (less than 10um) particulate matter pollutant.
Their effect (on the environment) depends on the size of particles. According to CPCB, particulate matter of 2.5u or less in diameter are responsible for causing great harm to human health. The particular matter of 2.5 or less in size are inhaled deep into the respiratory tract (upto lungs) and causes respiratory problems and may even lead to death.
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