Automobile Emission Standards (U.S.)
Exhaust emission standards for automobiles and trucks were established in 1970 and amended in 1990. Below are shown the standards for automobiles.
Emission Standards (g/km)
Compliance is now required for 10 years or 160,000 km, with relaxed standards for the second 80,000 km of vehicle life. Note that testing is conducted throughout this mileage, and the vehicle must meet the standard at the of the period.