Matching
6. On the sources and types of air pollutants figure, choose the letter that represents CO, CO2, SO2, NO, NO2, most hydrocarbons, and most suspended particles.
7. On the sources and types of air pollutants figure, choose the letter that represents SO3, HNO3, H3SO4, H2O2, O3, PANs, and most NO3- and SO42- salts.
6. ANS: A
7. ANS: B
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