Fuels Combustion - Nitrogen Oxides (NO_x) Emission

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Emission of Nitrogen Oxides - NO_x - when burning common fuels are indicated in the table below:

¹⁾ note that the emission varies widely depending on application temperatures and air/fuel ratios. In general - higher combustion temperature and  higher air/fuel ratios increases NO_x emissions.

²⁾ zero emission for hydrogen is a theoretically value. In practice hydrogen burned in air produces more NO_x than natural gas due to the high flame speed

3) catalytic systems common on most modern vehicles reduces NO_x

NO_x emissions contributes to eutrophication, acidification and the formation of ground-level ozone.

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