This limit is reduced to 0.062 by 2003, and fixed at 0.35 by the 2010 model year. Heavier vehicles, including trucks and sport utility vehicles, would have to meet an average of 0.043 grams by 2010, less than half the current standard of 0.099 grams. The strictest limits suggested by the federal Environmental Protection Agency, in contrast, would set an average emissions level for light and medium weight vehicles of 0.06 grams until 2010. Heavy weight vehicle emissions would only be reduced to 0.09 grams by 2010. These limits, known as Tier II, have not yet been formally adopted, and may still be defeated by the opposition of auto manufacturers.
Federal law allows states to adopt and enforce their own emissions standards.
The Alliance of Automobile Manufacturers has said it supports federal Tier II standards, and would prefer to be held to a single standard, rather than juggling multiple rules. Significantly, in the early 1990s, the auto industry voluntarily adopted the original LEV standards for most of the nationwide fleet. Recipients should seek permission to reprint the article from the source listed above. Reading on line, downloading or other use of this information signifies acceptance of these conditions, and the Full Disclaimer.