A defined area such as a large city,may be classified as a PSD area with respect to some pollutants,but not with respect to others.

Question

Quizplus · Accepted Answer

This is true because different pollutants may have different sources and characteristics, which can affect their dispersion and concentration in the air. Therefore, it is possible for a large city to be a PSD area for some pollutants (e.g. nitrogen oxides) but not for others (e.g. particulate matter).

A Defined Area Such as a Large City,may Be Classified