OPINION
B. FLETCHER, Circuit Judge:
In response to levels of pollution that violated national air quality standards, the San Joaquin Valley Unified Air Pollution District adopted "Rule 9510," which requires development sites to reduce the amount of pollutants they emit. The National Association of Home Builders (NAHB) sued the District, claiming that Rule 9510 is preempted by the Clean Air Act. The district court held that Rule 9510 is not preempted. We...
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