1. Presentation to the Air Quality Forum – August 9, 2005 C lark C ounty R egional O zone and P recursors S tudy (CCROPS) Robert A. Baxter, CCM T & B Systems, Inc.

2. Background  EPA issued the nonattainment designation for the 8-hour ozone NAAQS in 2004  Clark County DAQEM charged with preparation of attainment and maintenance plans  Characterization of ozone episodes  Knowledge and understanding of various meteorological and air quality conditions leading to exceedances

3. Ozone Studies  Emissions studies –Inventories –Emissions –Control measures  2004/2005 CCROPS –Ozone characterization study –2005 field study

4. CCROPS Objectives  Obtain a data set to help understand the origin of ozone and precursors  Assess the adequacy of the Clark County monitoring network to measure peak ozone  Obtain a data set of known quality for model validation  Generate a database for current and future SIP development  Provide recommendations for future research to support modeling of ozone

5. CCROPS Measurements Upper Air Meteorology  Radar wind profiler  Sodars  Rawinsondes  Pilot balloons  Glider temperature

6. CCROPS Measurements Surface Ozone and Meteorology  Supplemental ozone measurements (10)  Boundary (2)  Saturation ozone measurements (13)

7. CCROPS Measurements Surface Ozone and Meteorology  Supplemental ozone measurements (10)  Boundary (2)  Saturation ozone measurements (13)

8. CCROPS Measurements Surface Ozone and Meteorology  Supplemental ozone measurements (10)  Boundary (2)  Saturation ozone measurements (13)

9. CCROPS Measurements Upper Air Ozone  Ozonesondes  Aircraft

10. CCROPS Measurements Upper Air Ozone  Ozonesondes  Aircraft

11. CCROPS Measurements Upper Air Ozone  Ozonesondes  Aircraft

12. CCROPS Measurements Upper Air Ozone  Ozonesondes  Aircraft

14. CCROPS Measurements Precursor and Reactive Species  Volatile Organic Compounds (VOCs)  Nitrogen species (NO 2, PAN, NO y, Nitric Acid)  Enhanced DAQEM NO/NO x /NO 2

15. Ozone Site Locations

19. Sampling Schedule  Study Period = May 1 – August 31  Intensive Operational Periods (IOPs) –May 15 – August 31 –Four periods, 1 to 2 weeks in duration –Added rawinsondes and saturation ozone  Episodes –15 forecasted days within IOPs –Added ozonesondes, VOCs and aircraft

20. What Have We Seen?  Ozone Patterns Similar from Characterization Study Years  Transport Scenarios  Significant Ozone Production from Regional Fires

21. Questions? Please contact: Department of Air Quality and Environmental Management (DAQEM) (702) 455-5942