Discussion
Which of the following gas is not considered for the measurement of Air Quality Index (AQI) ?
Answer: C
The gas not considered is nitrogen.
India's National Air Quality Index uses eight pollutants: PM10, PM2.5, nitrogen dioxide, sulphur dioxide, carbon monoxide, ozone, ammonia and lead.
Sulphur dioxide, oxides of nitrogen and carbon monoxide are all measured. Nitrogen gas, which makes up about 78 percent of the air, is harmless and is not a pollutant, so it is not part of the index.
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