Ozone Nonattainment (Workgroups, Planning, etc.)

Contact: Robert Irvine, 517-284-6749
Agency: Environment, Great Lakes, and Energy


The United States Environmental Protection Agency (USEPA) published ozone nonattainment designations for the 2015 National Ambient Air Quality Standard (NAAQS) in the federal register on June 4, 2018, with an effective date of August 3, 2018. Michigan is among the states with areas designated as nonattainment with the 2015 ozone standard. The counties that were designated as nonattainment are Berrien, Livingston, Macomb, Monroe, Oakland, St. Clair, Washtenaw, and Wayne. In addition, portions of Allegan and Muskegon Counties were also designated as nonattainment. Ozone nonattainment areas are classified based on the severity of their ozone concentrations. All areas in Michigan are classified as marginal nonattainment, which is the lowest level of classification and means that ozone concentrations are less than 10 parts per billion (ppb) above the standard.

Ozone Non-Attainment Designation Map

Marginal Nonattainment Areas

Michigan currently has four areas in Marginal nonattainment. The Clean Air Act requires several responses/actions be taken for areas designated as marginal.

  • Baseline Emission Inventory
  • Nonattainment New Source Review
  • Major Source Emission Statements

Moderate Nonattainment Areas

If Michigan does not achieve design values below the 2015 ozone NAAQS standard by 2021, it is possible those areas will be "bumped" to Moderate Nonattainment. This will require additional actions to be taken.

  • VOC/NOx RACT for Major and CTG Sources
  • 15% VOC or 15% VOC/NOx Decrease (over six years)
  • Attainment Demonstration
  • Basic Inspection and Maintenance (for larger population areas: 200,000+ based off 1990 census)
  • Contingency Measures for Failure to Attain

Ozone Attainment Roadmap

Please note: The following planning documents were developed before COVID-19 impacted the State of Michigan.  The dates and timeframes contained within them will be revised as appropriate when more is known.

  • Planning

The Air Quality Division is actively working on requirements for upcoming deadlines associated with the 2015 ozone standard.  Other activities include planning for a possible moderate classification, a summer ozone study and much more.  The following document(s) was/were created to assist us in planning and development:

  • Timeline


*data subject to changed based on USEPA rules

**Alternatives to a Moderate Classification bump-up include a Marginal one-year extension or a 179B(b) demonstration.

  • 2020 Southeast Michigan Meteorological Field Study

    EGLE is collaborating with the U.S. Forest Service (USFS) in planning and executing a meteorological field study in the summer of 2020 to help address ozone nonattainment in Southeast Michigan. The USFS will take detailed measurements of wind direction and wind speed at different heights in the atmosphere over time. These measurements will supplement the wind speed and direction data the AQD continues to collect at its air monitoring stations. The information will be used to determine how much various sources of pollution contribute to Southeast Michigan’s ozone values and ultimately to develop an ozone attainment plan for the area.

  • Workgroups

    The following workgroups have been established with the intent of facilitating early discussion of potential control strategies for a moderate nonattainment SIP for the southeast Michigan Ozone nonattainment area:

    • Primary Formaldehyde and VOC/NOx RACT: This workgroup is looking at stationary sources of formaldehyde, often formed as a result of combustion of common fuels. In addition, the group will also look at large sources of NOx and VOC within the nonattainment area. The two subjects are combined in this workgroup because their is often significant overlap. For additional information, contact Tracey McDonald at 517-284-6756, Marissa Stegman at 517-284-6751, or Erica Wolf at 517‑284‑6766.
    • Oil & Gas Emissions: This workgroup will investigate sources of methane from the transmission of natural gas and refined petroleum products in an attempt to see if a correlation exists between elevated ozone values and emission points. For additional information, contact Erica Wolf at 517‑284‑6766.
      • Related documents coming soon.
    • Intermodal Transportation Emissions: This workgroup will focus on emissions that are potentially generated from heavy duty trucks, airports, train yards and boat transport. For additional information, contact Breanna Bukowski at 517‑284‑6737 or Marissa Stegman at 517-284-6751.
      • Related documents coming soon.
    • Southeast Michigan Modeling and Measurement Steering Committee:  This workgroup will make decisions regarding the collection of data that can be used for non-attainment planning.   For additional information, contact Jay Olaguer at 517-284-6774

More Information on Ozone

Permitting information and other topics

Latest Ambient Monitoring Data

  • None at this time.

Related Documents