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2019 Environment - Air pollution, Biomass burning

Consider the following: 1. Carbon monoxide 2. Methane 3. Ozone 4. Sulphur dioxide Which of the above are released into atmosphere due to the burning of crop/biomass residue?

  • 1 and 2 only
  • 2, 3 and 4 only
  • 1 and 4 only
  • 1, 2, 3 and 4

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