Dinitrogen is a robust compound,but reacts at high altitude to form oxides. The oxide of nitrogen that can damage plant leaves and retard photosynthesis is

Which among the following has the highest concentration of $PAN$?

Particulate pollutants include .......

Which of the following is a particulate pollutant?

Given below are two statements.
Statement $I:$ In polluted water,values of both dissolved oxygen and $BOD$ are very low.
Statement $II:$ Eutrophication results in a decrease in the amount of dissolved oxygen.
In the light of the above statements,choose the most appropriate answer from the options given below.

What is the significance of the troposphere for us?