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8-Hour Ozone (2008 NAAQS)

Calendar
August 16, 2016
July 28, 2016

Background

On 03-12-2008, EPA strengthened its national ambient air quality standards (NAAQS) for ground-level ozone, the primary component of smog. These changes will improve both public health protection and the protection of sensitive trees and plants. EPA revised the 8-hour “primary” ozone standard, designed to protect public health, to a level of 0.075 parts per million (ppm). The previous standard, set in 1997, was 0.08 ppm.

EPA also strengthened the secondary 8-hour ozone standard to the level of 0.075 ppm making it identical to the revised primary standard. Current ozone air quality concentrations in many areas of the country -- including some areas that meet the 1997 ozone standards -- are high enough to harm sensitive vegetation and ecosystems.

EPA estimates that the revised standards will yield nationwide health benefits valued between $2 billion and $17 billion. Those benefits include preventing cases of bronchitis, aggravated asthma, hospital and emergency room visits, nonfatal heart attacks and premature death, among others.

On 05-21-2012, EPA published two rules: 1) the final implementation rule of the 2008 NAAQS for Ozone: Nonattainment Area Classifications Approach, Attainment Deadlines, and Revocation of the 1997 Ozone Standards for Transportation Conformity Purposes and 2) Air Quality Designations for the 2008 Ozone NAAQS. The implementation rule establishes classifications and associated attainment deadlines and revoked the 1997 ozone standards for transportation conformity purposes. The designation rule finalized the nonattainment area boundaries for areas that do not meet the 0.075 parts per million (ppm) standard. The designations are based on air quality monitoring data, recommendations submitted by the states and tribes, and other technical information including emissions, commuting patterns, population growth, weather patterns, and topography.

Sacramento ozone nonattainment area boundaries match the boundaries for the 1997 ozone standards and remains classified as a severe ozone nonattainment area with an attainment deadline of 2027.

EPA published the final implementation rule of the 2008 NAAQS for Ozone to address the requirements on 03-06-2015 for reasonable further progress (RFP), requirements for modeling and attainment demonstrations, and requirements for reasonably available control measures (RACM) and reasonably available control technology (RACT). This rule also requires an attainment demonstration plan to be submitted by 07-2016 for area designated as severe. CARB submitted the 2012 Baseline Emissions Inventory to EPA in July 2014 to satisfy the requirements in Clean Air Act § 182 (42 USC 7511a).

 

Agency

Action

Status and documents

US EPA

 

Implementation Rules

Implementation of the 2008 NAAQS for Ozone: State Implementation Plan Requirements
Final Rule: Federal Register Vol 80 No. 44 pg 12264 (PDF) 03-06-15
Proposed Rule: Federal Register Vol 78 No. 109 pg 34178 (PDF) 06-06-13

Implementation of the 2008 NAAQS for Ozone: Nonattainment Area Classifications Approach, Attainment Deadlines and Revocation of the 1997 Ozone Standards for Transportation Conformity Purposes
Final Rule: Federal Register Vol 77 No. 98 pg 30160 (PDF) 05-21-12
Proposed Rule: Federal Register Vol 77 No. 30 pg 8197 (PDF) 02-14-12

EMFAC2014 Model Notice of Availability: Federal Register Vol. 80 No. 239 pg 773377 (PDF) 12-14-15

Designations for the 2008 Ozone NAAQS

Air Quality Designations for the 2008 Ozone National Ambient Air Quality Standards
Final Rule: Federal Register Vol 77 No. 98 pg 30088 (PDF) 05-21-2012

Notification to designate areas in California nonattainment for the revised 2008 NAAQS (PDF) 12-09-11

Technical Analyses for Designations.
Summary document (PDF)
All Technical Analyses (PDF)
All Appendices (PDF)
EPA Responses to State Recommendations
Letter (PDF), Attachment 1 (PDF), Attachment 2 (PDF) 12-09-11

National Ambient Air Quality Standards (NAAQS)

National Ambient Air Quality Standards for Ozone
Final Rule: Federal Register Vol 73 No. 60 pg 16436 (PDF) 03-27-08
Fact Sheet (PDF)
Proposed Rule: Federal Register Vol 72 No. 132 pg 37818 (PDF) 07-11-07
Fact Sheet (PDF)

CARB
EMFAC2014 Model

Transmittal Letter to EPA (PDF) 05-21-15

2012 Baseline Emissions Inventory

Transmittal Letter to EPA (PDF) 07-17-14
ARB Resolution 14-14 (PDF) 06-26-14
Public Notice of Board Hearing (PDF) 05-21-14
ARB Staff Report (PDF) 05-23-14

Designations Recommendations for the 2008 Ozone NAAQS

Letter: Remark on EPA responses (PDF) 02-23-12
Letter: Update to State's recommendation (PDF) 10-12-11
Letter: State's recommendation (PDF) 03-11-09

District
Board

None

 

District
(staff)

None