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Before the development of human technology, SO2 in the atmosphere came primarily from volcanic emissions and NO from lightning strikes that stimulated formation of this compound from the nitrogen and oxygen present in the natural atmosphere. Now, both of these materials come primarily from burning fuels: Some sulfur is present in coal and in fuels derived from petroleum, and nitrogen is present in biomass fuels, because of their protein content.

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Q: How are atmospheric SO2 and NO produced naturally?
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