LDEQ Recommendations to EPA for 2015 Ozone NAAQS Designations



The EPA finalized the revised primary and secondary National Ambient Air Quality Standards (NAAQS) for ozone on October 26, 2015 (80 FR 65292).  The final rule strengthened both standards to 70 parts per billion (ppb), while retaining the form and averaging period of the standards (i.e., 3-year average of the annual fourth-highest daily maximum 8-hour average).  On September 29, 2016, the Louisiana Department of Environmental Quality (LDEQ) submitted its formal area designation recommendations for the 2015 Ozone NAAQS to the EPA.

The LDEQ's recommended area designations for the 2015 Ozone NAAQS were based on its review of quality-assured 2013 through 2015 ozone monitoring data.  The recommended designation for all Louisiana parishes is "Unclassifiable/Attainment" with the exception of the parishes listed below for which the recommended designation is "Nonattainment":

  • Ascension
  • East Baton Rouge
  • Iberville
  • Livingston
  • West Baton Rouge

The EPA will respond to the recommendations by June 1, 2017 and intends to complete the initial area designations by October 1, 2017 using 2014 through 2016 ozone monitoring data.

If you have questions regarding the LDEQ's recommended area designations for the 2015 Ozone NAAQS, please contact the Baton Rouge office at (225) 346-4003.