Photochemical smog consists of an excessive amount of $X$,in addition to aldehydes,ketones,peroxyacetyl nitrate $(PAN)$,and so forth. $X$ is

What is the Global Warming Potential $(GWP)$ of $N_2O$ relative to $CFC$s?

Name the acids present in acid rain and state their sources in rainwater.

$SO_2$ pollution is indicated by

Mention the type of pollutants of tropospheric pollution.

Which of the following statements are correct?
a) $F^{-}$ ion concentration above $2 \ ppm$ causes brown mottling of teeth
b) The maximum limit of nitrate in drinking water is $400 \ ppm$
c) Depletion of ozone layer leads to cataract and skin cancer
d) The irritant red haze in the traffic is due to oxides of sulphur