Which of the following is not a gaseous air pollutant? A. Oxides of nitrogen B. Hydrocarbon C. Smoke D. Oxides of sulphur

The correct answer is C. Smoke.

Smoke is a solid particulate matter that is formed when organic materials are burned. It is a mixture of carbon, soot, and other particles that can be harmful to human health.

Oxides of nitrogen (NOx) and hydrocarbons (HC) are

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