Question

According to the central pollution control board (CPCB) which particulate size in diameter (in micrometers) of the air pollutants is responsible for the greatest harm to human health?
A. 10 or less
B. 2.5
C. 25 or less
D. 15 or less

Answer 1

The air pollutants have a smaller diameter in size. The diameter is measured in microns. Particulate stuff like smoke and haze are included. Ultrafine particles are the smallest of the particles in size. 100 nanometer is the diameter of the ultrafine particles. These sized particles cannot be seen by the naked eye.

Complete answer:
Generally the Particulate air pollutant like soot, essentially fly ash, the dust of various types, pollens, spores, fur, hair can be differentiated as settable and subtly suspended particulate matter pollutants. the effect on the environment by the particles depends upon the size of the particles.
According to the Central Pollution Control Board (CPCB), particulate size 2.5 micrometers or generally less in diameter of PM 2.5 particularly are responsible for causing the greatest harm to very human health, which specifically is quite significant. These particularly fine particulates can essentially be inhaled pretty deep into the lungs and can cause breathing and respiratory symptoms, irritation, inflammations, and damage to the lungs, and premature deaths, showing how their effect on the environment depends upon the size of the particles. As per the Central Pollution Control Board (CPCB), the particulate with the size of 2.5 micrometers or the size less in diameter of PM 2.5 mostly are responsible for causing the greatest harm to very human health in a subtle way.

Hence the correct answer is B. According to the central pollution control board (CPCB) 2.5 particulate size in diameter (in micrometers) of the air pollutants is responsible for the greatest harm to human health.

Note:
Some large particles can be seen by the naked eye. Dust, dirt, or smoke, soot are some of the particles which can be seen by the naked eye. The particles which are smaller in size can be detected and seen under the electron microscope.