Which of the following causes "blue baby syndrome"?

Explain in short: Pollution of the troposphere caused by hydrocarbons.

Which of the following factors is responsible for water pollution?

Which of the following is a renewable resource?

Given below are two statements:
Statement $I:$ Classical smog occurs in cool humid climate. It is a reducing mixture of smoke,fog and sulphur dioxide.
Statement $II:$ Photochemical smog has components,ozone,nitric oxide,acrolein,formaldehyde,$PAN$ etc.
In the light of above statements,choose the most appropriate answer from the options given below:

In environmental chemistry,the medium which is affected by a pollutant is called the