Diesel exhaust is produced by the combustion (burning) of diesel fuel. The exhaust is a complex mixture of gases, vapours, aerosols, and particulate substances. The exact nature of the exhaust depends on a number of factors including the type of engine, how well serviced/maintained the engine is, type of fuel, type of oil, speed and load on the engine, and emission control systems. Diesel exhaust may contain:
- Carbon (soot)
- Carbon monoxide
- Carbon dioxide
- Oxygen
- Water vapour
- Ammonia
- Nitrogen
- Oxides of nitrogen
- Oxides of sulphur
- Alcohols
- Aldehydes
- Ketones
- Hydrocarbons
- Aromatic compounds such as benzene, toluene, and polycyclic aromatic hydrocarbons (PAHs)
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