What emissions does a petrol engine output?

Combustion of the air-fuel mixture in a petrol engine results primarily in the emission of the following pollutants: NOx (nitrogen oxides), particulate matter (soot), CO (carbon monoxide) and HC (hydrocarbons). HJS catalytic converters are capable of converting more than 99% of these pollutants once the engine has reached normal operating temperature.

NOx (nitrogen oxides)

  • Collective term for compounds of nitrogen and oxygen
  • Contribute to "waldsterben" (acid rain)
  • Together with hydrocarbons, responsible for smog formation

Particulate matter (soot)

  • Solid, particulate matter, such as soot (carbon particles), the emissions problem primarily associated with diesels
  • Particularly harmful to health, carcinogenic

CO (carbon monoxide)

  • CO emissions are formed during incomplete combustion of a rich air-fuel mixture
  • CO is a colourless and odourless gas
  • It reduces the blood's ability to absorb oxygen and poisons the body as a result

HC (hydrocarbons)

  • Collective term covering all chemical compounds of carbon (C) and hydrogen (H)
  • Long-term exposure to HC emissions is carcinogenic

Last update on 2013-07-05 by Dominique Winkler.

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