A rule issued by the federal Environmental Protection Agency (EPA) limits the amount of carbon that can be emitted from a car's exhaust system. California state law allows much higher amounts of pollution. Under the supremacy clause

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The supremacy clause of the U.S. Constitution establishes that federal law takes precedence over state law when there is a conflict. Therefore, the EPA rule would control over the California state law.

A Rule Issued by the Federal Environmental Protection Agency (EPA)