The National Air Quality Index (AQI) uses how many pollutants to calculate the index?

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Accepted Answer

1. The National AQI is based on a set of standard air pollutants monitored by agencies.

2. These are: PM2.5, PM10, NO2, SO2, CO, O3, NH3 and Pb.

3. Counting them gives $8$ pollutants.

4. So the correct choice is option (b).

FINAL_ANSWER: <b>

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Answer

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