Emissions & gases

CO2

CO2 is carbon dioxide, a greenhouse gas released when carbon-containing fuels are burned. Road-vehicle policy uses tailpipe CO2 in emissions testing, taxation and vehicle classifications. Battery electric vehicles produce no tailpipe CO2 while driving because they do not burn petrol or diesel onboard. Tailpipe CO2 is not the same as lifecycle greenhouse-gas emissions, which can include vehicle manufacturing and energy production.