Which of the following pollutant shows its effect mainly in stratosphere?
Name one source and one harmful effect of each of the following air pollutants :
(a) Sulphur dioxide
(b) Nitrogen oxides
(c) Carbon monoxide
(d) Chlorofluorocarbons (CFCs)
Which of the following air pollutant is capable of preventing photosynthesis in plants?
(a) CFCs
(b) nitrogen oxide
(c) dust
(d) carbon monoxide
Ozone layer depletion is mainly caused due to ___.
(CFCs/methane/nitrogen oxides)