Cycling to work, I emit hydrocarbons

Not me - my car that is sitting back at home. While I'm saving those co2 emissions, it is releasing hydrocarbons and contributing to smog: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