Discussion
Identify the most dominant pollutant in terms of its concentration levels in urban atmosphere.
Answer: D
The key gives carbon monoxide as the most dominant pollutant by concentration in urban air. Vehicle exhaust produces it in large quantities by incomplete combustion, and its concentrations are in the range of milligrams per cubic metre, much higher than the microgram levels of the others.
Oxides of nitrogen and sulphur occur at microgram per cubic metre levels. Particulate matter is a major pollutant by health impact and is measured in micrograms per cubic metre as well. The answer is option D.
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