Utah Ozone Study, 2010-11, Preliminary Results

455 views
410 views

Published on

Please visit airquality.utah.gov for more information.

Published in: Technology, Business
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
455
On SlideShare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
1
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Utah Ozone Study, 2010-11, Preliminary Results

  1. 1. Ozone Special Study 2010-2011Preliminary Results Seth ArensUtah Division of Air Quality Air Monitoring Section
  2. 2. Need for a Special Study• Lower ozone standard? – Ozone NAAQS will be reviewed in 2013• No ozone data outside Wasatch Front – Ozone in rural areas or mountain valleys?• Regional ozone pollution – Transport from other large cities, power plants
  3. 3. Study Objectives1. Determine extent of potential ozone nonattainment area2. Assess role of regional pollution3. Examine the influence of Great Salt Lake
  4. 4. Portable ozone monitoring equipment Portable ozone monitorPark City 2010 Park City 2011
  5. 5. Ozone adjacent to Wasatch Front 2010-2011• Mountain valleys• Tooele Valley• Nephi• Great Salt Lake sites
  6. 6. High Ozone in Park City Park City 77 / 75 ppb• Moderate ozone in Hawthorne 83 / 75 ppb 2010 (73 / 66 ppb)• Park City: Higher Cottonwood ozone in 2011 81 / 74 ppb – 16 days > 70 ppb – 25 days > 65 ppb• Cottonwood (SLC) – 12 days > 70 ppb – 25 days > 65 ppb Permanent sites Temporary sites
  7. 7. Park City and Salt Lake City (2011) Park City Salt Lake City 75hourly ozone (ppb) 50 25 0 8/5 8/6 8/7 8/8 8/9 8/10 8/11 8/12
  8. 8. High Ozone in Huntsville Harrisville 74 / 73 ppb Huntsville 73 / 72 ppb Ogden 8/10 – 8/31 80 / 74 ppb• Huntsville – 5 days > 70 ppb – 15 days > 65 ppb• Harrisville – 5 days > 70 ppb Permanent sites – 13 days > 65 ppb Temporary sites
  9. 9. Ozone in Huntsville and Harrisville (2011) Huntsville Harrisvillehourly ozone concentration (ppb) 75 50 25 0 8/24 8/25 8/26 8/27 8/28 8/29 8/30
  10. 10. Erda, Tooele & Great Salt Lake Great Salt Lake Marina 80 / 73 ppb• Erda – 18 days > 70 ppb – 24 days > 65 ppb Erda• Great Salt Lake 89 / 80 ppb Marina – 9 days > 70 ppb – 16 days > 65 ppb• Tooele Tooele – 6 days > 70 ppb 75 / 71 ppb Permanent sites – 15 days > 65 ppb Temporary sites
  11. 11. Great Salt Lake can enhance ozone formation • Ozone forms early in day over lake – High albedo • Morning heating – Wind blows away from lake • Evening cooling Ozone – Down-canyon winds – Higher ozone over lake • Diurnal pattern remains during high pressure
  12. 12. Ogden Morgan 83 / 68 ppb 65 / 60 ppb 2010 Ozone Spanish Fork • Lower at Morgan 75 / 71 ppb Heber?? compared to Ogden • Lower at Nephi Nephi compared to 65 / 60 ppb Spanish Fork • Heber similar to North Provo Permanent sites Temporary sites
  13. 13. High ozone at rural western Utah sites• Wendover (2011) – 70/68 ppb – 1 day > 70 ppb – 10 days > 65 ppb• Desert Range (2011) – 74/69 ppb – 3 days > 70 ppb – 11 days > 65 ppb• Lytle Ranch (2011) – 78/72 ppb• Sites very remote – No nearby source of ozone precursors
  14. 14. Low to moderate ozoneat other rural Utah sites • Park Valley (2010) – 69 / 58 ppb – Wildfire smoke outlier • Milford (2010) – 55 / 55 ppb • Filmore (2011) – 62 / 60 ppb
  15. 15. Why high ozone in western Utah? • Not sure yet, but…. • Biogenic VOCs – High ozone events in spring to early summer • Potential transport of ozone precursors – NOx and VOCs – Las Vegas, Los Angeles – Coal-fired power plants in Nevada and Utah
  16. 16. Potential sources ofozone precursors San Francisco ion ind dir ant w Las Vegas ect min Do KEY Los Angeles Power plant DAQ ozone site Other ozone sites
  17. 17. Ozone NAAQS• All of Utah currently in attainment• Erda had highest ozone in 2011• Park City and Huntsville surprisingly high• If standard is lowered to ≤70 ppb: – Potential nonattainment in counties of: • Davis, Salt Lake, Weber (all) • Beaver, Box Elder, Carbon, Summit, Tooele, Utah, Wasatch, Washington • Uinta Basin – Brock LeBaron
  18. 18. Future Directions• Surprising results in 2011 – More questions than answers• Ozone saturation studies – Summit County – Tooele County• Long-range transport issue – NOx in West Desert?• Focus on Great Salt Lake
  19. 19. Questions? Price, UT 2010

×