Urban smog contains several air pollutants,including ozone.For a typical sunny day,when would you expect the concentration of ozone to be highest?
A)midnight
B)6 a.m.
C)noon
D)6 p.m.

Question

Quizplus · Accepted Answer

Ozone is formed when nitrogen oxides and volatile organic compounds react in the presence of sunlight. Therefore, the concentration of ozone is highest during sunlight hours. The highest point of sunlight is around noon, but it takes time for the reaction to occur and for ozone to form, so the concentration is highest in the afternoon, typically around 6 p.m.

Urban Smog Contains Several Air Pollutants,including Ozone