Which of the following pollutants is not emitted during volcanic eruptions ? 

Ozone depletion in the stratosphere is mainly caused by 

Lead in water can cause 

Planting more and more trees helps to 

Persons working in cement plants and lime stone quarries are more prone to disease like 

Main pollutant from automobile exhaust is 

BHC and DDT act as

The lowest layer of earth's atmosphere is 

Ozone hole is maximum over 

Ozone in stratosphere is depleted by