Which of the following statement about pollutants is incorrect ?

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SO3 is a primary pollutant and it is also a component of classical smog

NO is a primary pollutant and it is also a component of photochemical smog

CH4 is a primary pollutant and also a green house gas

PAN is a secondary pollutant and a component of Los Angles smog

answer is A.

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Detailed Solution

SO3 is a secondary pollutant and it is not a component of classical smog ;

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