Monitoring Aspects of the Final Ozone Rule. NACAA Monitoring Committee October 29, 2015

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1 Monitoring Aspects of the Final Ozone Rule NACAA Monitoring Committee October 29, 2015

2 Monitoring Aspects of the Final Rule Updates to the Photochemical Assessment Monitoring Stations (PAMS) Extension of the ozone monitoring season in 32 states and D.C. New Federal Reference Method (FRM) for ambient measurements of ozone while retaining existing FRM and Federal Equivalent Methods (FEMS) Revisions to the Part 53 FEM performance testing requirements New Appendix U to Part 50 data handling provisions for determining compliance with the revised NAAQS 2

3 Ozone Monitoring Seasons EPA requires ozone monitoring only during the ozone season the time of year when weather conditions are most favorable for ozone formation. This season varies by state Final rule extends the ozone monitoring season for 32 states and the District of Columbia One month for 22 of the 32 states and the District of Columbia Additional extensions of two months to seven months including states where ozone can be elevated during the winter Year-round seasons for all NCore multi-pollutant sites All waivers are revoked when the rule becomes effective (60 days from FR publication) Regions and states with existing waivers should pursue new waivers as appropriate Regional Administrators will still be allowed to approve changes to states ozone monitoring seasons without rulemaking Expanded monitoring season requirements and year-round monitoring at NCore will become effective January 1,

4 Ozone Seasons: Current Requirements /15-10/15 NH RI MA CT NJ DE MD DC 4

5 Ozone Seasons: Finalized Requirements / NH RI MA CT NJ DE MD DC Season Change No Change 5

6 Ozone Federal Reference Method (FRM) FRMs provide a definitive method for measuring concentrations of criteria pollutants for comparison to the NAAQS and a standard of comparison for approving federal equivalent methods (FEMs) The ET-CL FRM was initially promulgated in 1971 and is no longer available commercially nor being technically supported by instrument manufacturers EPA finalized a new FRM to include an additional method that is based on Nitric Oxide Chemiluminescence (NO-CL) Current FRM and FEM ozone monitors will continue to meet EPA requirements, so states are not required to replace their existing ozone monitors Impact on the ozone monitoring network is minimal as existing approved methods can continue to be used for monitoring 6

7 Revisions to the Part 53 Federal Equivalent Method (FEM) Requirements Revised the performance testing requirements for candidate FEMs to make them consistent with current ozone analyzer performance (Table B-1) Change in performance requirements would not affect existing FRM or FEM designations Correcting a minor inconsistency in units (% URL to % Standard Deviation) for precision for consistency across all analyzer types Extending length of time for Administrator to take action on requests for modification of FRM/FEM from 30 to 90 days (40 CFR 53.14(c)) Removing an obsolete provision in 40 CFR 53.9(i) that manufacturers submit annual updates to Product Manufacturing Checklist for PM FRMs/FEMs 7

8 New Appendix U to Part 50 (data handling) EPA is finalizing as proposed Appendix U to Part 50, which deals with data handling provisions for determining compliance with the revised O 3 NAAQS Appendix U is similar to Appendix P for the 2008 O 3 NAAQS, except for the following elements: Revisions to the procedures in Appendix P for determining daily maximum 8- hour average concentrations Addition of a new procedure for combining data when two or more monitoring instruments are operating at the same monitoring site Addition of a new procedure allowing the Regional Administrator to approve site combinations when monitoring sites are replaced or relocated Minor change to the data substitution test in Appendix P (used to determine a clear exceedance of the NAAQS in the presence of missing data) 8