Discussion
Consider the following statements about the air quality index:
1. It converts several pollutants to sub-indices on a common scale.
2. The reported value is the highest sub-index.
3. It is the instrument used to assess a source's legal compliance.
Which of the statements given above is or are correct?
Answer: D
Correct answer: 1 and 2 only
The first two describe the index correctly: it converts each pollutant's concentration to a sub-index on a common scale, and reports the highest of them.
The third mistakes its purpose. Legal compliance of a source is assessed against emission standards measured at the stack, not against an ambient index that reflects every source in the area together with the weather. The index is a public communication instrument, not an enforcement one.
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