The District is required to prepare and update air quality plans to meet or maintain compliance with federal and state air quality standards. The two most common type of air quality plans are: attainment plans, which must show how the region will attain an air pollutant standard by a certain date; and maintenance plans, which must demonstrate how the region will continue to maintain compliance with a standard. Development of these plans requires extensive collaboration with other agencies within the region, industries, businesses, the public, as well as cooperation with the other Air Quality Management Districts (AQMD) within the Sacramento Federal Nonattainment Area (SFNA) planning boundaries, which for ozone and PM2.5 include all or part of Yolo-Solano AQMD, Placer County APCD, Feather River AQMD (not for PM2.5), and El Dorado AQMD; and PM10 boundary includes just Sacramento County. Map of the nonattainment areas is available here.
Current Planning Efforts
Ozone Attainment Plan - 2015 Ozone Standard
Adopted State Implementation Plan (Plan)
The SFNA air districts and California Air Resources Board (CARB) held public hearings to consider this Plan in Fall 2023. All SFNA air districts adopted the Plan and submitted the Plan to CARB. CARB also adopted the Plan after their public hearing on 10/26/2023. The Plan was submitted to United States Environmental Protection Agency (EPA) for final review and approval. The Plan documents and transmittal packages are available under this (link).
The SFNA air districts and/or CARB have submitted several plan elements to EPA as SIP revisions. These include:
The table below shows a list and links to existing plans (Attainment and Reasonable Further Progress (RFP) Plan and Maintenance Plans) and reports for ozone and particulate matter, which are the two pollutants of greatest concern in the Sacramento region. This table includes Federal Register actions taken by the EPA and other relevant information.
1 SFNA is currently classified as Serious (86 FR 59648) nonattainment area. Preliminary photochemical modeling results do not support the attainment by the Serious classification deadline; as a result, the SFNA air districts have requested a voluntary reclassification and the request is pending EPA's approval. The voluntary reclassification letters are available here: Air Districts to CARB (pdf) and CARB to EPA (pdf).
2 The Sacramento Metropolitan Air Quality Management District approved this Plan on 08/24/2017 and CARB approved the Plan on 11/16/2017.
3 This plan was a statewide plan, which included the SFNA. It addressed outstanding legal issues such as establishing a base year of 2017 (instead of 2018) and establishing contingency measures.
4 EPA approved both of these plans in
86 FR 58581. Final action on the contingency measures element was deferred due to the 9th Circuit Court decision (08/26/2021), which found that EPA's contingency measure approach reflected an unreasonable interpretation of the CAA and was arbitrary and capricious because it provided a nominal emission reductions. EPA disapproved the contingency measures portion of the Plan on 06/15/2023 (88 FR 39179).
5 The United States Court of Appeals Court decision (02/16/2018) requires full compliance with all five conditions in CAA §107(d)(3)(E) which includes the need to develop a Maintenance Plan.
6 Approved by all air districts but never submitted to EPA due to exceedance in 2013.
7 The triennial assessment reports the level of air quality improvement and the amounts of emission reductions achieved from control measures for the preceding three-year period.
8 California Health and Safety Code section 40924(a) requires districts to prepare an Annual Progress Report and submit the report to the CARB summarizing its progress in meeting the schedules for developing, adopting, and implementing the air pollution control measures contained in the district's Triennial Reports by 12/31 of each year.
Action taken by CARB on these items, including staff reports, resolutions, submittal letters to EPA and public hearing notices can be found