61.
Condensation nuclei may be:

63.
Moisture in the air is known as

64.
"Smog" is a mixture of

65.
The major pollutant from automobile exhaust is

66.
Nitrogen oxide and hydrocarbons released by automobiles interact to form

67.
The Expansion of SPCA

68.
Deforestation generally decreases

69.
What is Canopy?

70.
The presence of solid, liquid or gaseous compounds, which may not be normally present, or in excess concentration in the atmosphere is called