Four major constituents of atmospheric air are

1. N²
2. Ar
3. O²
4. CO²

^{Arrange them in ascending order of their % in air :}

Carbon monoxide is pollutant, which causes

Radioactive solid nuclear wastes are disposed off by

Which of the following is not a natural source of air pollution

Which one of the following is not a main industrial heat source

Accidents in chemical plants are mostly due to