The Sacramento region was designated nonattainment for four of the six criteria pollutants: ozone, PM2.5, PM10 and carbon monoxide. Consequently, our air quality plans are focused on these pollutants. The Sacramento region currently meets the National Ambient Air Quality Standard (NAAQS) for carbon monoxide, lead, nitrogen dioxide, PM10 and sulfur dioxide. Maintenance plans for carbon monoxide and PM10 are listed below. Information on the air quality standards and attainment status for each of these pollutants can be found here.
The federal Clean Air Act (CAA) requires plans to identify how nonattainment areas will attain the NAAQS by the attainment date. Key elements of these plans include emission inventories, emission control strategies and rules, motor vehicle budgets, air quality data analyses, modeling and air quality trends. EPA reviews air quality plans to make sure they are consistent with the requirements of the CAA.
The Sacramento ozone planning region, see map, includes all of Sacramento and Yolo counties and portions of Placer, El Dorado, Solano, and Sutter counties. The region was classified as a severe nonattainment area for the 1997 8-hour NAAQS of 84 ppb. In 2013, the regional air districts developed the Sacramento Regional 8-Hour Ozone Attainment and Reasonable Further Progress Plan to address how the region would attain the 1997 8-hour standard. This plan was approved by U.S. EPA effective March 2, 2015 (80 FR 4795).The region shows that it attained the 1997 8-hour NAAQS based on ambient data for the 2013–2015 monitoring period.
Plans and reports that have been developed in the past to meet federal requirements of previous NAAQS include:
Sacramento Area Regional Ozone Attainment Plan (1994) This report shows how the region attained the 1979 1-hour ozone NAAQS. The districts of the Sacramento region developed the attainment plan in November 1994.
1-Hour Ozone Attainment Determination Request for the Sacramento Federal Ozone Nonattainment Area (2010). A request for supplemental information was prepared and approved by the board, submitted but never acted upon by EPA. It will be resubmitted in conjunction with the former 1997 8-hour NAAQS to show attainment of both standards.
Exceptional Events Demonstration for High Ozone in the Sacramento Regional Nonattainment Area Due to Wildfires (2011) This report demonstrates how wildfires contributed to high ozone concentrations in 2008.
Air quality standards for PM are based on particle size:
The Sacramento PM2.5 planning region, see map, was classified as attainment for the 2012 annual average PM2.5 NAAQS of 12 μg/m3, and classified as nonattainment in 2009 for the 2006 24-hour PM2.5 NAAQS of 35μg/m3. The region prepared the PM2.5 Maintenance Plan and Redesignation Request (2013) to address how the region would attain the 24-hour PM2.5 standard. The region attained the standard based on 2009–2011 monitoring data, but postponed the submittal of the plan because of high concentrations from 2012 that caused exceedances. The submittal of this Plan will be updated based on monitoring data for 2015 and 2016, which shows that the region will be able to attain the PM2.5 standard. The particulate matter planning region includes all of Sacramento County, the eastern portion of Yolo County, the western portions of El Dorado and Placer counties and the northeast portion of Solano County (map).
The Sacramento region was classified as attainment for the 1997 PM10 24-hour NAAQS of 150 μg/m3. In October 2010, the SacMetro AQMD prepared the PM10 Implementation /Maintenance Plan and Redesignation Request for Sacramento County (2010). EPA approved the PM10 Plan, which allowed EPA to proceed with the redesignation of Sacramento County as attainment for the PM10 NAAQS.
The Sacramento region is currently designated attainment for both the 1-hour NAAQS of 35 parts per millions (ppm) and the 8-hour standard of 9 ppm. A maintenance plan was developed for CO in 1996. The 2004 Revision to the California State Implementation Plan for Carbon Monoxide extends the 1996 CO maintenance plan demonstration to 2018.
To obtain a copy of plans previously adopted by the region, reports or supporting documents, please send a request by email to email@example.com.