Which of the following does not cause atmospheric pollution?

How is excessive content of $CO_2$ responsible for global warming?

Explain why sometimes foaming is seen in river water near the place where sewage water is poured after treatment?

Which air pollutant is responsible for the Bhopal gas tragedy?

The pollution due to oxides of sulphur gets enhanced due to the presence of:
$(a)$ particulate matter
$(b)$ ozone
$(c)$ hydrocarbons
$(d)$ hydrogen peroxide
Choose the most appropriate answer from the options given below:

Excess nitrate in drinking water can cause