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UNITED STATES DISTRICT COURT SOUTHERN DISTRICT OF ...

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Case 1:08-cv-07837-PAC Document 51 Filed 10/31/2008 Page 25 of 26<br />

2. Application<br />

Plaintiffs argue that the 25/30 Rules should be preempted under the CAA because, even<br />

though the TLC rules regulate fuel economy, their purpose and effect is to regulate emissions,<br />

which is the exclusive province of the federal government. This argument would appear to be<br />

foreclosed under the reasoning of Green Mountain and Central Valley, where the courts found<br />

that GHG emissions regulations were not preempted by the EPCA because the regulations were<br />

not de facto fuel economy standards and because emissions regulations do not “relate to” fuel<br />

economy standards within the meaning intended by Congress in the EPCA preemption statute.<br />

See Green Mountain, 508 F. Supp. 2d at 353-54; Cent. Valley, 529 F. Supp. 2d at 1176.<br />

In this case the argument is reversed—Plaintiffs claim that a fuel economy regulation<br />

should be preempted by the CAA, which exclusively governs emissions regulation. Plaintiffs<br />

have failed to show a likelihood of success on this issue because both Green Mountain and<br />

Central Valley make clear that the preemption provisions of the EPCA and the CAA relate<br />

specifically to their defined categories—fuel economy and emission regulation, respectively—<br />

and while they may overlap, they do not conflict. Thus, crossover between the two for<br />

preemption purposes is not automatic. Cent. Valley, 529 F. Supp. 2d at 1175. It follows that<br />

Plaintiffs here cannot simply stretch the CAA’s preemption provision for emissions regulation to<br />

cover the 25/30 Rules, which by their terms cover only mileage standards and are silent as to<br />

emissions.<br />

Plaintiffs fail to show how the 25/30 Rules are a “standard relating to the control of<br />

emissions from new motor vehicles,” as required under the preemption provision of CAA § 209.<br />

At this stage of the proceedings the Court cannot accept Plaintiffs’ argument that the only<br />

purpose of the 25/30 Rules is to affect emissions. As indicated, the Court has limited its review<br />

25

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