Which of the following is NOT a secondary air p... - SS3 Chemistry Environmental Chemistry: Pollution and Conservation Question
Which of the following is NOT a secondary air pollutant?
A
Ozone (O3)
B
Sulphur dioxide (SO2)
C
Nitrogen dioxide (NO2)
D
Particulate matter (PM2.5)
correct option: d
Particulate matter (PM2.5) is a primary air pollutant, directly emitted from sources such as vehicles and industrial processes. Ozone, sulphur dioxide, and nitrogen dioxide are secondary pollutants formed by chemical reactions in the atmosphere.
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