A) Increase in 'Q' concentration increases the rate of photosynthesis.
B) 'R' are used in aerosols cans, jet fuel and as refrigerants in air conditioners.
C) 'S' is produced by combustion of nitrogen rich fuels, livestock wastes and breakdown of nitrogen fertilisers in soil.
D) 'P' is a potent secondary pollutant.
Correct Answer: B
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