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Q. |
Which of the following is not a gaseous air pollutant? |
A. | Oxides of nitrogen |
B. | Hydrocarbon |
C. | Smoke |
D. | Oxides of sulphur |
Answer» B. Hydrocarbon | |
Explanation: The gaseous air pollutants of primary concern in urban settings include sulfur dioxide, nitrogen dioxide, and carbon monoxide; these are emitted directly into the air from the combustion of fossil fuels. Smoke a collection of airborne solid and liquid particulates and gases emitted when a material undergoes combustion, is also a pollutant. Hydrocarbon is an organic compound consisting entirely of hydrogen and carbon. |
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