Agricultural burning contributes to emissions of nitrogen oxides, carbon monoxide and organic compounds. The environmental and human costs of agricultural open burning far outweigh the near-term economic benefits for farmers. Responsible for more than a third of all black carbon emissions, open burning is the single largest source of black carbon, a short-lived climate pollutant that contributes to air pollution, climate change, and increased melting in the cryosphere.
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Methane contributes to air pollution because it is one of the main chemicals released into the air during the production and manufacturing of products, it's Ali pretty much the same thing with agricultural burning.