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2015 Ozone NAAQS State Implementation Plan


In 2015, U.S. Environmental Protection Agency (EPA) promulgated a new National Ambient Air Quality Standards (NAAQS) for Ozone at a maximum daily 8-hour average concentration of 0.070 parts per million (ppm). The Sacramento Federal Nonattainment Area (SFNA, map) exceeded the standard and based on the modeling forecast, the SFNA air districts have requested a classification to "Severe" with attainment deadline of August 3, 2033. The Sacramento Regional 2015 National Ambient Air Quality Standard 8-Hour Ozone Attainment and Reasonable Further Progress Plan (Plan) below addresses the Clean Air Act planning requirements associated with the "Severe" classification.

Plan Documents

The Plan includes the elements of ozone trends, emissions inventories, photochemical modeling, attainment demonstration, ozone transport, conformity (general and transportation), reasonable further Progress (RFP), weight of evidence, vehicle miles traveled (VMT) offset demonstration, reasonably available control measure (RACM) analysis, statewide control measures, and proposed state and local contingency measures. 

Sacramento Regional Attainment and RFP Plan (Final)

DocumentFile Format
​​Attainment and RFP Plan with Appendices 
-- Except the Spreadsheets


App A-1-1 Estimated Emissions Forecast Summary
App F-6-1-II Placer County Ozone data between 01/01/2015 and 09/21/2019

​Public Hearings, Adoption Schedule, and Transmittal Package

Sacramento Federal Nonattainment Area (SFNA) air districts  and California Air Resources Board  (CARB) held public hearings to consider adoption of the Plan. The Plan covers the SFNA, which comprises with Sacramento and Yolo counties, and portions of El Dorado, Placer, Solano, and Sutter counties. The plan has been adopted by the SFNA air districts and CARB. The links of the transmittal documents are available below.

​Air District

​Date, time, and Transmittal Package

Sacramento ​Metropolitan Air Quality Management District

Thursday, ​September 28, 2023, 9:00am

SIP Transmittal Pacakge (pdf)

El Dorado Air Quality Management District

Tuesday, October 17, 2023, 9:00am

SIP Transmittal Package (pdf)

Feather River Air Quality Management District

Monday, ​October 2, 2023, 4:00pm

SIP Transmittal Package (pdf)

Placer County​ Air Pollution Control District

​Thursday, October 12, 2023, 2:30pm

SIP Transmittal Package (pdf)

Yolo-Solano Air Quality Management District

​Wednesday, October 11, 2023, 9:00am

SIP Transmittal Package (pdf)

​California Air Resources Board

Thursday, October 26, 2023, 11:00am

SIP Webpage (link)

CARB Staff Report (pdf)

CARB SIP Transmittal Package (pdf)

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