Idling engines can produce around double the emissions of a moving engine, claims GEM Motoring Assist.
The road safety and breakdown organisation believes stationary running engines could contribute to the 40,000-annual air pollution-related deaths in the UK.
Leaving engines running is illegal, but also wastes fuel and a negative impact on the environment.
GEM road safety officer Neil Worth, explained: “Idling means your car, van or truck pumps loads more carbon dioxide, carbon monoxide and other potentially harmful exhaust gases into the air.
“That’s why it’s an offence under section 42 of the Road Traffic Act 1988, as made clear by Rule 123 of the Highway Code. Leaving a vehicle engine running unnecessarily while stationary on a public road can land you with a £20 penalty charge notice.
“So we ask drivers to think twice before sitting stationary in their vehicle with the engine running. By switching off you will be helping to improve air quality, reducing your carbon footprint and complying with the law.”