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"During combustion, the reaction between coal and the air produces oxides of carbon, including carbon dioxide (CO2, an important greenhouse gas), oxides of sulfur (mainly sulfur dioxide, SO2), and various oxides of nitrogen (NOx). Because of the hydrogenous and nitrogenous components of coal, hydrides and nitrides of carbon and sulfur are also produced during the combustion of coal in air.[citation needed] These include hydrogen cyanide (HCN), sulfur nitrate (SNO3) and other toxic substances.
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