New Car Net
 Carbon Dioxide Emissions Information 
The Government is committed to reducing emissions of carbon dioxide (CO2) from cars and improving local air quality. CO2 is a major source of greenhouse gases, which contribute to climate change.
For the private motorist, the impact is the revised Road Tax system known as Graduated Vehicle Excise Duty (GradVED), which quite simply means - the less it pollutes, the less you pay.

  Private User CO2 information  
For the company car driver, the new company car benefit tax is also linked to CO2 emissions - favouring drivers who choose 'cleaner' cars.
  Company Car CO2 information