The 1970 Clean Air Act was no mere piety. It ordered William Ruckelshaus, as head of the Environmental Protection Agency, to propose a set of national air-quality standards, and within 90 days to determine the final ones. Now Ruckelshaus has done just that, despite protests from the Automobile Manufacturers Association, which calls his rules "disproportionate to any demonstrated health and safety need."
The rules affect two main sources of air pollution:
AUTOS emit the bulk of carbon monoxide and hydrocarbons. Under the new rules, clean air means a maximum nine parts of CO per...
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