Vehicles sitting in the sun for days at a time can spew out damaging hydrocarbons – one of the main ingredients in smog, a federal government study has found.
Hydrocarbons are in the vapour that escapes from petrol tanks on a warm day. Most newer cars have canisters that trap them before they are released but if cars are left sitting for longer than 24 hours the canisters can fill up and stop working until the vehicle is driven, the Second National In-Service Emissions Study found.
As many as 3 million Australian cars may not conform to Australian standards for evaporative emissions.
"The results indicate that when vehicles are parked in warm conditions for an extended period (more than a day), the evaporative emission control systems may not be able to effectively control the build-up of evaporative hydrocarbons, as even the latest systems are only designed to provide effective control for a continuous 24-hour period," the report said.
Ya know ya do ya best... At least this lets me off the cycling 5 days a week. Maybe I drive to the train station twice a week, and cycle the rest. And drive on rainy days.
Global Warning Climate Change Energy