California Emissions Sticker
California's emissions standards are stricter than the federal EPA requirements. They're more stringent on hydrocarbon and nitrogen oxide (NOx) emissions -- which become smog -- from vehicles, and they have heavier requirements that older construction vehicles be retrofitted so that they operate cleaner. California's gasoline also has less sulfur, benzene and hydrocarbons than most gasoline sold elsewhere in the U.S.
The state has created a number of categories for motor vehicle emissions. Even if you don't live in California, if you have a relatively new car, you've likely seen stickers somewhere on your vehicle that indicate these emissions:
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