The ultraviolet radiations in the stratosphere are absorbed by

Wind blown acidic gases and particles settle down from the atmosphere on to the earth is called

If the solar radiation is less the photo chemical smog formation becomes incomplete, the air is called

The process of deposition of acid on earth from the atmosphere is called

The pH of acid rain is

Physical water pollutant

Large no. of microbes and high level of water pollution indicated by

Which of the following is a secondary pollutant?.