Primary pollutants can be
A. SO2, CO
B. PAN, O3
C. Both of these
D. None of these
Answer: Option A
A. SO2, CO
B. PAN, O3
C. Both of these
D. None of these
Answer: Option A
The term 'brown air' is used for
A. Acid fumes
B. Photochemical smog
C. Sulphurous smog
D. Industrial smog
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