Question

Which of the following is air pollutant?

• A. CO
• B. NO
• C. CFC
• D. All of the above

Answer 1

The correct option is D All of the above

Carbon monoxide (CO)—a colorless, odorless, tasteless, and toxic air pollutant—is produced in the incomplete combustion of carbon-containing fuels, such as gasoline, natural gas, oil, coal, and wood.

Oxides of nitrogen ($N{O}_x$) is the term usually used to refer to nitrogen monoxide (nitric oxide or NO; a colourless and odourless gas) and nitrogen dioxide ($N{O}_2$); a red-brown gas with a pungent smell which is soluble in water). Nitrogen monoxide reacts with oxygen or ozone in the air to produce nitrogen dioxide.

Chlorofluorocarbons (CFCs) are anthropogenic compounds that have been released into the atmosphere in various applications such as in air-conditioning, refrigeration, blowing agents in foams, insulations and packing materials, propellants in aerosol cans, and as solvents.

Hence, option D is correct.