___________causes several diseases in man and animal.

We receive natural radiation from

_______ percent of oxygen present in air. 

The heaviest of the particle emissions are:

  One of the most polluted river in the world is

__________is an indication of disturbances to the composition of compound in the atmosphere.

Highest percentage of air consists of 

Soil erosion is mainly caused due to

Incinerators are used to reduce

Green house gas is