The living organisms on or around the earth constitute

Acrolein $(X)$ is one of the chemicals formed when $O_3$ and $NO_2$ react with unburnt hydrocarbons present in the polluted air. The structure of '$X$' is

Give a brief explanation about the international standards for drinking water.

Which gas was responsible for the Bhopal gas tragedy in $1984$?

Depletion of ozone layer is caused by

Thermal power plants can lead to: