Smog is a combination of:

Justify the statement: "Dust is a pollutant".

State whether the following statement is True or False:
Nitrogen gas makes up $78 \%$ of our atmosphere and nitrogen is also a part of many molecules essential to life like proteins,nucleic acids ($DNA$ and $RNA$) and some vitamins.

State whether the following statement is True or False:
Plants generally take up nitrates and nitrites and convert them into amino acids which are used to make carbohydrates.

Describe the steps and process involved in the nitrogen cycle. Also,show the cycling of various nutrients in this cycle.

Low visibility during cold weather is due to