What are major sources of air pollution?

Choose the correct alternative: In metro cities, automobiles/industries are the major sources of air polllution.

What are the sources of water pollution ?

The source of air pollution is:

What are the main sources of pollution in Mumbai?

What is radioactive pollution? What are sources of radioactive pollution?

The major source of noise pollution world wide is due to :

What are the three major types of pollution?

What are the three major types of pollution ?