CO is primarily emitted from incomplete combustion in vehicles. SO₂ is mainly produced from the burning of fossil fuels in power plants and industries. Both contribute significantly to urban air pollution, although the dominant pollutants can vary based on the city's primary sources (e.g., traffic vs. heavy industry).
The main air pollutant(s) in metropolitan cities is/are
Asked in MPPSC CS Prelims 2018 · Topic: Pollution (Air Pollution: Types, sources, primary & secondary pollutants, smog, acid rain, effects, control technologies & policies.)
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