Nitrogen Oxides (NOx) Emission when Combustion Fuels
Emission of Nitrogen Oxides - NOx - when combustion fuels like oil, coal, propane and more
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Emission of Nitrogen Oxides - NOx - when burning some common fuels are indicated in the table below:
| Fuel | Emission of NOx 1) (g/kg fuel) |
| Oil | 3.0 |
| Kerosene | 3.0 |
| Coal | 4.5 |
| Propane | 2.3 |
| Gasoline | 27 3) |
| Hydrogen | 0 2) |
| Natural Gas | 1.0 |
| Butane | 2.3 |
| Wood | 0.7 |
1) note that these numbers vary widely depending on application temperature and air/fuel ratio - in general higher combustion temperature and higher air/fuel ratio increases NOx emission
2) zero emission for hydrogen is a theoretically value. In practice hydrogen burned in air produces more NOx than natural gas due to the high flame speed
3) catalytic systems common on most modern vehicles reduces NOx
NOx emissions contribute to eutrophication, acidification and the formation of ground-level ozone.
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