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Pacific Southwest, Region 9

Serving: Arizona, California, Hawaii, Nevada, Pacific Islands, Tribal Nations

Air Actions, California

California-Wide, Multi-Area, and Tribes

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October 2017: Final Rule on Ozone Monitoring in the Bakersfield Metropolitan Statistical Area (MSA) 

October 17, 2017 - EPA approved part of a State Implementation Plan submittal regarding ambient air quality monitoring for the 1997 and 2008 ozone National Ambient Air Quality Standards in the Bakersfield Metropolitan Statistical Area, in southern San Joaquin Valley.

Contact Information

Rory Mays (mays.rory@epa.gov)
(415) 972-3227


September 2016: (Direct final approval) Approval and Promulgation of Implementation Plan; California; Calaveras County, Chico (Butte County), San Francisco Bay Area and San Luis Obispo County (Eastern San Luis Obispo) Base Year Emission Inventories for the 2008 Ozone Standards

September 28, 2016 - EPA is taking direct final action to approve revisions to the California State Implementation Plan concerning the base year emission inventories for four areas designated as nonattainment areas for the 2008 ozone National Ambient Air Quality Standards. The subject areas include Calaveras County, Chico (Butte County), San Francisco Bay Area and San Luis Obispo (Eastern San Luis Obispo). We are approving these revisions under the Clean Air Act.

Contact Information

Nancy Levin (levin.nancy@epa.gov)
(415) 972-3848


November 2015: Final Rule on California's Infrastructure State Implementation Plan (SIP) Submittals 

November 24, 2015 - EPA partially approved and partially disapproved California's Infrastructure State Implementation Plan submittals for the 1997 ozone, 2008 ozone, 1997 fine particulate matter (PM2.5), 2006 PM2.5, 2012 PM2.5, 2008 lead (Pb), 2010 nitrogen dioxide (NO2), and 2010 sulfur dioxide (SO2) National Ambient Air Quality Standards.

Contact Information

Rory Mays (mays.rory@epa.gov)
(415) 972-3227


March 2015: Pechanga Reservation 8-hour Ozone Final Rule

March 20, 2015 - EPA made a change to the boundaries of the air quality planning area containing the Pechanga Reservation and approved a redesignation request and maintenance plan for this area for the 1997 8-hour ozone standard. This action made the Pechanga Reservation its own attainment area for the 1997 8-hour ozone standard. The Reservation is currently its own “moderate” nonattainment area for the 2008 8-hour ozone standard as a result of a 2012 EPA designation.

December 2014: Pechanga Reservation 8-hour Ozone Proposed Rule

December 23, 2014 - EPA proposed to change the boundaries of the air quality planning area containing the Pechanga Reservation and to approve a redesignation request and maintenance plan for this area for the 1997 8-hour ozone standard.

Contact Information

Ken Israels (Israels.ken@epa.gov)
(415) 947-4102


February 2015: Final Approval of California Regional Haze Implementation Plan

Feb 27, 2015: EPA took final action to approve California Regional Haze State Implementation Plan as making adequate progress to achieve the visibility goals for 2018 in the State's 29 protected Class I areas.

September 2014: Proposed Approval of California Regional Haze Implementation Plan

September 17, 2014: EPA proposed to approve CA's determination that the existing California Regional Haze State Implementation Plan is making adequate progress to achieve the visibility goals for 2018 in the State's 29 protected Class I areas.

Contact Information

Krishna Viswanathan (viswanathan.krishna@epa.gov)
(520) 999-7880

Older Actions

September 2014: Proposed Rule on California's Infrastructure State Implementation Plan (SIP) Submittals

September 30, 2014: EPA proposed to partially approve and partially disapprove California's Infrastructure SIP submittals for the 1997 ozone, 2008 ozone, 1997 fine particulate matter (PM2.5), 2006 PM2.5, 2012 PM2.5, 2008 lead (Pb), 2010 nitrogen dioxide (NO2), and 2010 sulfur dioxide (SO2) NAAQS.

Contact Information

Rory Mays (mays.rory@epa.gov)
(415) 972-3227


September 2014: Finding Notice on California's Failure to Submit Interstate Transport State Implementation Plan (SIP) Revisions for Fine Particulate Matter (PM2.5)

September 30: EPA issued a finding that California failed to submit a SIP revision to address interstate transport requirements pertaining to significant contribution to nonattainment and interference with maintenance of the 2006 24-hour PM2.5 NAAQS in other states.

Contact Information

Rory Mays (mays.rory@epa.gov)
(415) 972-3227


September 2013: Final Rule to Designate the Morongo Reservation Its Own Nonattainment Area for the 1-hour Ozone and 1997 8-hour Ozone Standards

September 4, 2013: EPA finalized a rule to correct an error that affected the Morongo Reservation. This final action makes the Morongo Reservation its own nonattainment area for 1-hour ozone and the 1997 8-hour ozone standards. The Reservation is already its own nonattainment area for the 2008 8-hour ozone standard as a result of a 2012 EPA action.

December 2012: Proposed Error Correction and Designation of the Morongo Reservation

On December 20, 2012: EPA proposed to correct an error in a previous rulemaking that revised the boundaries between nonattainment areas in Southern California established under the Clean Air Act for the purpose of addressing the revoked one-hour ozone air quality standard. EPA also proposed to redesignate the areas of Indian country of the Morongo Band of Mission Indians, California (Morongo Reservation) as a separate air quality planning area for the one-hour and 1997 eight-hour ozone standards. If finalized, the Morongo Reservation will be its own nonattainment area for each of the federal ozone standards.


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November 2012: EPA Determinations that Seven Areas in California have Attained the 1997 Ozone National Ambient Air Quality Standard

November 19, 2012: EPA made a final rule determining that seven ozone nonattainment areas in California have attained and continue to attain the 1997 8-hour ozone National Ambient Air Quality Standard. The seven ozone nonattainment areas are: Amador and Calaveras Counties, Butte County (Chico), Kern County (Eastern Kern), Mariposa and Tuolumne Counties, Nevada County (Western Part), Sutter County (Sutter Buttes), and Ventura County.


August 2012: Final Approval of California Fumigant VOC Regulations and Revisions to the California SIP Pesticide Element for San Joaquin Valley

August 14, 2012: EPA approved pesticide measures submitted by the California Department of Pesticide Regulation (DPR) to reduce volatile organic compound emissions from pesticides in five California ozone nonattainment areas: South Coast, Southeast Desert, Ventura, San Joaquin Valley, and Sacramento Metro. These measures include DPR's field fumigant regulations and revisions to the California SIP pesticide element.

Contact Information

Nancy Levin (Levin.Nancy@epa.gov)
(415) 972-3848

April 2012: Proposed Approval of California Fumigant VOC Regulations and Revisions to the California SIP Pesticide Element for San Joaquin Valley

April 13, 2012: EPA proposed to approve pesticide measures submitted by the California Department of Pesticide Regulation (DPR) to reduce volatile organic compound emissions from pesticides in five California ozone nonattainment areas: South Coast, Southeast Desert, Ventura, San Joaquin Valley, and Sacramento Metro. These measures include DPR’s field fumigant regulations and revisions to the California SIP pesticide elements.


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August 2011: Final actions on California's Interstate Transport State Implementation Plan (SIP) for the 1997 8-hour ozone NAAQS and 1997 fine particulate (PM2.5) NAAQS

March 17, 2011—August 8, 2011: Clean Air Act section 110(a)(2)(D)(i) requires that the California SIP contain adequate provisions to prohibit emissions from adversely impacting downwind states. These "good neighbor" requirements address four specific elements: 1) significant contribution to nonattainment of the NAAQS, 2) interference with maintenance of the NAAQS, 3) interference with required measures for prevention of significant deterioration (PSD), and 4) interference with required measures to protect visibility. Over the period of May 9, 2011 to July 29, 2011, EPA finalized action on all four elements of the California Interstate Transport SIP for the 1997 8-hour ozone NAAQS and 1997 PM2.5 NAAQS. These actions were published as follows:


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May 2011: Final Approval of California's Regional Haze Plan

May 9, 2011: EPA finalized action to approve a revision to the California State Implementation Plan (SIP).  We found that that the California Regional Haze Plan fulfilled the Clean Air Act requirement to make reasonable progress towards the national goal of achieving natural visibility conditions in the state's twenty-nine Class I areas.  Class I areas are national parks, national forests, wilderness areas, and national seashores where visibility is an important value. We provided a 30-day comment period with our March 15, 2011 proposal and received no comments on our proposed action.

April 2010: Final Rule Granting Reclassification Requests for Four 8-hour Ozone Nonattainment Areas in California

April 15, 2010: EPA made a final rule to grant requests from the State of California to reclassify four 8-hour ozone nonattainment areas as follows: San Joaquin Valley from "serious" to "extreme", South Coast Air Basin from "severe-17" to "extreme", and Sacramento Metro and Coachella Valley from "serious" to "severe-15". As part of this action, we are also reclassifying the tribal lands of 20 affected Tribes within these nonattainment areas, and are deferring the reclassification of tribal lands pertaining to the Morongo Band of Mission Indians and the Pechanga Band of Luiseno Mission Indians pending our final decisions on boundary change requests from each Tribe. These reclassifications set later attainment deadlines for each area while also requiring the State to meet more stringent requirements. While the State has already submitted most of the required revisions to the state implementation plan (SIP), this rule sets a schedule for the submission of the remaining SIP revisions.


November 2005: California SIP Revision

November, 2005: Carbon Monoxide Second Ten-Year Maintenance Plan Approval: Includes motor vehicle emissions budgets (MVEBs).


Title V Air Permits in California: Includes EPA’s final rule that returned the operating permits program to 34 California districts, Settlement Agreement between EPA and California citizen and environmental groups, and EPA's final rule to partially withdraw approval of California's operating permits program.

California New Source Review: Call for Revision to State Law to remove exemption for major agricultural stationary sources.

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