This case challenges the Bureau of Land Management’s (“BLM”) decisions to issue 121 oil and gas leases covering 117,720.59 acres in northwest Colorado and northeast Utah without considering how the air pollution from developing the leases will adversely impact public health, the environment, and treasured public lands like Dinosaur National Monument.

This action is brought under the federal Clean Air Act, 42 U.S.C. §§ 7401–7671q, to compel the U.S. Environmental Protection Agency to take the statutorily required action of making findings under 42 U.S.C. § 7410(k)(1)(B), and publishing notice of those findings in the Federal Register, that the State of California has failed to develop and submit at least four separate nonattainment state implementation plan revisions to combat persistent violations of the 1997, 2006, and 2012 National Ambient Air Quality Standards for fine particulate matter in the San Joaquin Valley, California.