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except perhaps in Southern California, to implement extremly low new car emissions standards before the end of the 20th century.” The authors characterized Southern California’s pollution problem as “much more severe and difficult to solve than that of any other area in the United States,” and said, “Federal Tier I standards appear to be sufficient for the other 49 states...”
The chief shortcoming with the California cars plan, according to the researchers, is that it does not address the crux of the pollution problem, namely the older, higher polluting vehicles on the road. It is estimated that 10 percent of the mostly older vehicles on the road account for 50 percent of air pollution. This relatively small group of vehicles, or “super emitters,” is responsible for an inordinately large amount of the auto-related pollution. Measures that focus solely on marginal improvements in new vehicles allow the problems posed by super emitters to go unchecked.
In fact, ironically, these measurers may even exacerbate the super-emitter problem. If California car standards raise significantly the prices of new vehicles, as they almost certainly will, then more consumers will be discouraged from junking old vehicles and investing in new ones. Slower fleet turnover is the inevitable result-older, less
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