CO

Definition

Carbon monoxide (CO) is a colourless, odourless gas emitted as a result of incomplete combustion of fossil fuels and biofuels.

Predominant sources of emissions

In general, any fuel containing carbon (gas, oil, coal, wood...) that is burned without sufficient oxygen to form CO2 is a potential source of CO. Carbon monoxide is produced indoors by combustion sources (cooking and heating) and is also introduced through infiltration of carbon monoxide from outdoor air into the indoor environment. Clogged fireplaces, heaters without properly functioning safety devices and tobacco smoke are the most important sources of carbon monoxide exposure.

Legislation and intervals

According to World Health Organization: The limit value for CO is 100 mg/m3 for 15 minutes average, 35 mg/m3 for 1 hour average, 10 mg/m3 for 8 hours average and 7 mg/m3 for 24 hours average.

According to DIRECTIVE 2008/50/EC of the European Parliament and of the Council of 21 May 2008 on ambient air quality and cleaner air for Europe: The limit value for CO is 10 mg/m3 for 8 hours average.