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In terms of impurities the ranking goes like this. Bituminous coal>Anthracite coal>Crude oil>Diesel>Gasoline>Natural Gas>Propane. An example of this is how vehicles in stadiums are powered by propane or nat gas. The more pure the fuel the less carbon monoxide and hazardous chemicals would be produce. You would hardly want to breath the fumes from a coal burning steam engine.

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Q: What fossil fuel contains more impurities than other fossil fuels?
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