An example of major air pollutant is: (a) \( \mathrm{O}_{2} \) (b) \( \mathrm{CO}_{2} \) (c) \( ...

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An example of major air pollutant is:
(a) \( \mathrm{O}_{2} \)
(b) \( \mathrm{CO}_{2} \)
(c) \( \mathrm{CO} \)
(d) \( \mathrm{He} \)
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