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What emissions are primarily a problem with diesel engines rather than gasoline engines?

Nitrogen oxides (NOx)

Diesel engines produce more NOx than gasoline engines because they operate at higher temperatures. NOx emissions can contribute to smog and acid rain.

Particulate matter (PM)

Diesel engines also produce more PM than gasoline engines. PM is a mixture of solid and liquid particles that can be harmful to human health when inhaled. Diesel PM is classified as a carcinogen by the World Health Organization.

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