Q. Consider the following statements about the Particulate Matter:
1. It is a complex mixture of solid and gaseous pollutants, only caused by manmade activities.
2. Sulphates and organic compounds are its major components.
Which of the above given statements is/are not correct?

[A] 1 only

[B] 2 only

[C] Both 1 and 2

[D] Neither 1 nor 2

Answer: A

Explanation: PM is a sum of all microscopic solid and liquid particles, of human and natural origin, that remain suspended in a medium such as air for some time. These particles vary greatly in size, composition, and origin, and may be harmful. Particulate matter may be in the form of fly ash, soot, dust, fog, fumes etc.

Particulate pollution does not include gas pollutants like ozone and NO2. PM 10 is particles 10 microns and below. PM 2.5 is 2.5 microns and below. (That means PM 10 includes PM 2.5.)

The major components of PM include metals, organic compounds (measured as organic carbon [OC]) including materials of biological origin, inorganic carbonaceous material (including black carbon [BC] and elemental carbon [EC]), and sulfate, nitrate, ammonium, and other ions.

Source: Shankar IAS