Review of Northeast Texas 2012 Ozone Season

1. Review of Northeast Texas 2012 Ozone Season Presentation to the NETAC Policy and Technical Committees June 13, 2013 Sue Kemball-Cook, Wilson Santamaria and Greg Yarwood ENVIRON skemballcook@environcorp.com

2. Today’s Presentation • Update on ozone Design Values and trends • Implications for attainment • Review of 2012 ozone season

3. Northeast Texas CAMS Monitors

4. In 2012, 4th high value decreased relative to 2011 for all three monitors

5. All three monitors attain the 2008 NAAQS using 2008-2010 data • Longview does not attain if 2009-2011 or 2010-2012 data are considered

6. 4th High Ozone Values Needed to Attain the NAAQS in 2013 • Table shows 4th high value needed in 2013 for monitor to achieve current NAAQS of 75 ppb • 4th high of 67 ppb or lower at Longview produces DV that attains • Lowest 4th high at C19 was 71 ppb in 2008

7. 2012 Temperatures http://www.ncdc.noaa.gov/sotc • 2012 was the warmest spring on record in Texas • Texas temperatures were warmer than usual in summer

8. 2012 Days with 8-hour Ozone > 75 ppb Shading shows monitor with highest daily maximum 8-hour ozone on that day

9. 2012 Days with 8-hour Ozone > 75 ppb

10. Review of 2012 Ozone Season

11. June 26, 2012 Back Trajectories Ending at 4pm Longview Tyler • High ozone at Tyler and Longview • High regional background ~65 ppb • Late afternoon peak at Tyler is likely due to Tyler urban plume • Little SO2 at Tyler and Longview 1-Hour Ozone

12. June 26 HYSPLIT Back Trajectories Karnack Tyler Longview

13. June 27, 2012 Back Trajectories Ending at 4pm Longview Tyler • High ozone at all three monitors • Very high (~75 ppb) background ozone • Morning power plant impact at Longview 1-Hour Ozone

14. June 27 HYSPLIT Back Trajectories Karnack Tyler Longview

15. August 9, 2012 Back Trajectories Ending at 5 pm Longview Tyler 1-Hour Ozone • Very high (~70 ppb) background ozone • Unusual wind speed/direction • Small amounts of SO2 present at Longview and Tyler indicate power plants contribute but are not primary cause of high ozone

16. August 9, 2012: HYSPLIT Back Trajectories Karnack Tyler Longview

17. August 10, 2012 Back Trajectories Ending at 5 pm Longview Tyler 1-Hour Ozone • Very high (~65 ppb) background ozone • Wind shift • Late afternoon Longview peak may be HRVOC impact • Early morning SO2 impacts at Longview and Tyler, but little SO2 present during ozone peaks

18. August 10: HYSPLIT Back Trajectories Karnack Tyler Longview

19. August 11, 2012 Longview Tyler Back Trajectories Ending at 5 pm 16 hours back trajectories ending at 4 pm 1-Hour Ozone • Background ozone ~65 ppb • Stagnant winds • SO2 at Longview indicates power plant contribution in late afternoon

20. August 11: HYSPLIT Back Trajectories Karnack Tyler Longview

21. August 14, 2012 Longview Tyler Back Trajectories Ending at 1 pm 1-Hour Ozone • Background ozone ~60 ppb • SO2 at Longview indicates power plant contribution to late afternoon peak

22. August 14: HYSPLIT Back Trajectories Tyler Karnack Longview