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hard • Past Paper
Which of the following is a 'Secondary Pollutant'?
Pollutant Formation
Primary Pollutants
(CO, SO2, NOx, VOCs)
Direct Emission (Sources)
Sunlight (UV)
Chemical Reaction
O3 (Ozone)
Secondary
A
CO
B
SO2
C
O3 (Ground-level ozone)
D
NO2