Starting Jan. 1, every 2009 model year and newer car sold in California will be required to carry a label that clearly ranks the vehicle’s environmental impact, in addition to the existing requisite smog ratings.There is a smog score and a global warming score (all based on a one to ten scale) which rate how much methane, nitrous oxide, carbon dioxide, etc. will be emitted by the car. Per the scale, ten is the best, five is average.For example 1 is 520 CO2-equivalent grams per mile and up, and 10 being less than 200.The new sticker applies only to 2009 models and later, not to any year end closeouts you might be interested in buying.

source : Puregreencars