Opinion ID: 621235
Heading Depth: 3
Heading Rank: 2

Heading: Mobile Source Emissions Regulation

Text: The CAA also regulates mobile source emissions. [5] [T]he regulation of mobile source emissions is a federal responsibility, [and] Congress has expressly preempted states from setting emissions standards for mobile sources. Jensen Family Farms, 644 F.3d at 938 (citing 42 U.S.C. § 7543(a)). California, however, is a notable exception to this general rule, and the CAA permits EPA to authorize California to set its own mobile source emissions standards so long as it obtains EPA approval. Id. at 938 n. 3 (citing 42 U.S.C. § 7543(b) (motor vehicles); id. § 7543(e)(2) (nonroad sources)); see also Nat'l Ass'n of Home Builders v. San Joaquin Valley Unified Air Pollution Control Dist., 627 F.3d 730, 733 (9th Cir.2010) ([T]he [CAA] gives the states the job of regulating stationary sources of pollution, but the EPA, and with the EPA's permission California, are responsible for regulating emissions from motor vehicles and other mobile sources.). California thus relies on its own mobile source standards in the development of its SIPs.