Opinion for the Court filed by Circuit Judge GINSBURG.
The South Coast Air Quality Management District, the Santa Barbara County Air Pollution Control District, and Friends of the Earth challenge the final rule promulgated by the Environmental Protection Agency extending the deadline for the EPA to establish more stringent emissions standards for large marine diesel engines. *1078 We conclude the EPA reasonably implemented the Clean Air Act (CAA) in extending the deadline, wherefore we deny the petitions for review.
I. Background
Section 213(a)(3) of the Act directs the EPA to establish emissions standards for new nonroad engines, including marine engines, that contribute to certain types of pollution. The standards must
achieve the greatest degree of emission reduction achievable through the application of technology which the Administrator determines will be available ... giving appropriate consideration to the cost of applying such technology ... and to noise, energy, and safety factors.
42 U.S.C. § 7547(a)(3). The standards are to “take effect at the earliest possible date considering the lead time necessary to permit the development and application of the requisite technology.” Id. § 7547(b).
In 1994 the EPA determined that marine engines contribute significantly to ozone pollution in certain areas and hence must be made subject to emissions standards. At issue in this case are standards for the largest type of marine engines, known as “Category 3” engines. See Control of Emissions from New Marine Compression-Ignition Engines at or Above 30 Liters per Cylinder, 68 Fed.Reg. 9746, 9747/3 (Feb. 28, 2003) [hereinafter Tier 1 Rule]. In 2003 the EPA adopted a two-stage approach to regulating those engines. Id. at 9748/3. The Tier 1 Rule established interim standards based upon technology available at that time. Id. The Tier 1 Rule also set April 27, 2007 as the deadline for promulgating Tier 2 standards, which would be based upon the more advanced technologies the EPA expected to become available. Id. at 9750/2. The EPA deferred to the same date deciding whether to apply the standards to foreign-flagged vessels that enter ports in the United States. Id. at 9759/3.
In
Bluewater Network v. EPA
In the Extension Rule, the EPA explained that despite the delay it “remains committed to developing and proposing Tier 2 emission standards for Category 3 marine diesel engines.” 72 Fed.Reg. at 68,520/2. Although it had gathered additional information since issuing the Tier 1 Rule, the EPA identified several issues that it must resolve before it can set Tier 2 standards. Id. at 68,520/1-2. The petitioners object that the EPA has violated its duty under § 213 by failing to set standards that attain the greatest degree of emissions reductions achievable with available technology. Relatedly, they argue the EPA’s claim it needs more time to set Tier 2 standards is not supported by the record.
*1079 II. Analysis
We have jurisdiction to review the Extension Rule because it is a “nationally applicable regulation!] promulgated” by the EPA under the Act. 42 U.S.C. § 7607(b)(1). As provided in the Act, we review the EPA’s action deferentially to determine only whether it is “arbitrary, capricious, an abuse of discretion, or otherwise not in accordance with law.”
Id.
§ 7607(d)(9)(A). In reviewing for arbitrariness, “[w]e give particular deference to the EPA when it acts under unwieldy and science-driven statutory schemes like the Clean Air Act.”
Bluewater Network,
A. Extension of the Deadline
The petitioners first contend the Extension Rule violates CAA § 213 because the EPA has acknowledged that more effective technologies are available now and the CAA obligates the EPA to set standards based upon available technologies. In promulgating the Rule, the EPA explained that, although it now has a better understanding of advanced technologies, it needs additional time to develop a Tier 2 emissions control program that exploits them effectively. 72 Fed.Reg. at 68,519/1. Specifically, the agency stated, it must still evaluate testing and compliance procedures, address the disposal of emissions removed from exhaust gases, and assess the costs and benefits of alternative emission control strategies using new methodologies that account for at-sea emissions transported to shore. Id. at 68,520/1-2.
In evaluating the petitioners’ statutory argument, we are not writing on a clean slate: In
Bluewater Network,
we held the EPA satisfied § 213 when it issued interim Tier 1 standards and committed to adopting by 2007 Tier 2 standards that would depend upon more advanced technologies.
Just as the agency’s original decision to regulate Category 3 engines in a two-tiered process did not violate § 213, neither does extending the deadline in order to complete the tasks necessary to devising an informed Tier 2 regulation. First, as
*1080
we held in
Bluewater Network,
§ 213 does not require the EPA to “adopt the most stringent standards based on the most advanced control technologies”; rather, it requires the EPA to consider a number of factors, including cost, noise, and safety.
Second, our reason for accepting as reasonable the EPA’s initial decision to defer setting Tier 2 standards applies equally to the Extension Rule: Although advanced technologies are more widely available now than they were in 2003, the EPA could reasonably “recognize! ] the merits of the advanced technologies” yet choose “not to forestall their
further
development by ... mandating their use without complete information and study.”
Bluewater Network,
The petitioners next contend the Extension Rule is arbitrary and capricious because the record does not support the EPA’s claim that it needs more time to set Tier 2 standards. This argument, not surprisingly, reprises the petitioners’ statutory argument; when a statute affords an agency substantial discretion — as § 213 does- — the
Chevron
inquiry overlaps analytically with the determination whether the agency acted arbitrarily.
See Nat’l Ass’n of Regulatory Util. Comm’rs v. ICC,
*1081 Finally, the petitioners claim the agency is arbitrarily delaying the rulemaking until it has negotiated international standards to control emissions from marine engines. In promulgating the Extension Rule, however, the EPA expressly represented that, although it does expect the international standard-setting process will generate relevant information that it should consider, it is “not deferring to that process.” 72 Fed.Reg. at 68,522/2. The petitioners give us no reason to doubt the EPA’s good faith in making this representation; the petitioners’ mere assertion to the contrary is not a basis upon which we can fault the agency. *
B. Foreign-Flagged Vessels
The petitioners also challenge the EPA’s postponement of the decision whether to apply any emissions standards to foreign-flagged vessels that visit ports in the United States. Foreign-flagged vessels now meet the Tier 1 standards by complying with the equivalent international standards.
Bluewater Network,
The Extension Rule reaffirms the EPA’s commitment to decide this issue when it issues Tier 2 standards. 72 Fed.Reg. at 68,522/3. Deferring resolution of the issue until it will have an effect remains reasonable and the petitioners’ objection therefore remains premature.
III. Conclusion
In view of the issues remaining for the EPA to resolve before it sets Tier 2 standards, we hold the Extension Rule deferring the deadline for promulgating a regulation is neither arbitrary nor unlawful. At the oral argument the petitioners allowed that they would not be objecting to the new deadline if they could be sure the EPA would adhere to it. The EPA gives that assurance in the Extension Rule, id. at 68,520/2, and the record, which demonstrates the EPA has made progress toward promulgating Tier 2 standards, see id. at 69,522, suggests no reason to doubt it. We rely upon that assurance in holding that the Rule is lawful. In sum, because the Rule commits the EPA to proceed with the two-tiered approach approved in Blue-water Network, and to resolve outstanding issues and set standards no later than December 17, 2009, the petitions for review are
Denied.
Notes
The EPA argues it satisfied its nondiscretion-ary duty to promulgate standards under § 213(a)(3) by the adoption of Tier 1 standards alone. In
Bluewater Network,
we held “the two-tiered approach to emissions standards ... satisfies the requirements of section 213(a)(3).”
The petitioners raise additional arguments in their reply brief, but in order to prevent “sandbagging of appellees and respondents,” we do not consider arguments that were raised neither in the opening brief nor by the respondents.
See Sitka Sound Seafoods, Inc. v. NLRB,
