Question

Which of the following is not a gaseous air pollutant?

• A. Carbon monoxide
• B. Nitrogen dioxide
• C. Soot
• D. Carbon dioxide

Answer 1

The correct option is C Soot

Agents which cause any undesirable change in the physical, chemical or biological characteristics of air are called air pollutants.

Air pollutants can be classified as -

• Gaseous pollutants - such as nitrogen dioxide, carbon monoxide, carbon dioxide, volatile organic compounds (VOCs) etc.
• Particulate matter - It refers to solid particles and liquid droplets suspended in air such as dust, soot, etc. These are inhalable particles with a diameter of either 10 micrometers or less than that.