(A) Suspended solid particles in air
(B) Pollutant gas present in air
(C) Microbes, present in air
(D) Greenhouse gas present in air
»Important Links:
Online Test Preparation and Mcqs Website.
(A) Suspended solid particles in air
(B) Pollutant gas present in air
(C) Microbes, present in air
(D) Greenhouse gas present in air