Association of Irritated Residents v. United States Environmental Protection Agency Michael Leavitt, in His Official Capacity as Administrator of the U.S. Environmental Protection Agency, Wayne Nastri, in His Official Capacity as Regional Administrator for Region Ix of the U.S. Environmental Protection Agency, and Deborah Jordan, in Her Official Capacity as Acting Regional Administrator Region Ix of the U.S. Environmental Protection Agency, San Joaquin Valley Unified Air Pollution Control District California Air Resources Board, Intervenors-Respondents. Medical Advocates for Healthy Air Latino Issues Forum Sierra Club v. United States Environmental Protection Agency Michael Leavitt, Administrator, U.S. Environmental Protection Agency and Wayne Nastri, Regional Administrator, Region Ix, U.S. Environmental Protection Agency, San Joaquin Valley Unified Air Pollution Control District California Air Resources Board, Intervenors-Respondents

423 F.3d 989 ASSOCIATION OF IRRITATED RESIDENTS, Petitioner, v. UNITED STATES ENVIRONMENTAL PROTECTION AGENCY; Michael Leavitt, in his official capacity as Administrator of the U.S. Environmental Protection Agency, Wayne Nastri, in his official capacity as Regional Administrator for Region IX of the U.S. Environmental Protection Agency, and Deborah Jordan, in her official capacity as Acting Regional Administrator Region IX of the U.S. Environmental Protection Agency, Respondents, San Joaquin Valley Unified Air Pollution Control District; California Air Resources Board, Intervenors-Respondents. Medical Advocates For Healthy Air; Latino Issues Forum; Sierra Club, Petitioners, v. United States Environmental Protection Agency; Michael Leavitt, Administrator, U.S. Environmental Protection Agency and Wayne Nastri, Regional Administrator, Region IX, U.S. Environmental Protection Agency, Respondents, San Joaquin Valley Unified Air Pollution Control District; California Air Resources Board, Intervenors-Respondents. No. 04-72650. No. 04-72736. United States Court of Appeals, Ninth Circuit. Argued and Submitted June 15, 2005. Filed September 6, 2005. COPYRIGHT MATERIAL OMITTED Susan Britton,…