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Ozone Trends in a Residential Area in Las Vegas, 2001

Ozone Trends in a Residential Area in Las Vegas, 2001. Arsineh Hecobian. Map of Monitoring Station. Source: http://www.mapquest.com. Zoom In Mode. Zoom In Mode. Total:. Segment:. Monitoring Station. http://major.ci.las-vegas.nv.us/website/clvcamps/viewer.htm. Palo Verde Site.

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Ozone Trends in a Residential Area in Las Vegas, 2001

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  1. Ozone Trends in a Residential Area in Las Vegas, 2001 Arsineh Hecobian

  2. Map of Monitoring Station Source: http://www.mapquest.com

  3. Zoom In Mode Zoom In Mode Total: Segment: Monitoring Station http://major.ci.las-vegas.nv.us/website/clvcamps/viewer.htm

  4. Palo Verde Site Palo Verde High School far western edge of valley- new construction, high O3, -suburban site

  5. DAQM Monitoring Stations • DAQM operates fifteen sites to monitor Ozone • DAQM operates eight sites to monitor the Oxides of Nitrogen

  6. Ozone Exceeding 8-h AQI Std Source: DAQM, 2001 NAMS/SLAMS NETWORK REVIEW, 2001

  7. 10th Percentile Comparison of O3 and NOx (June-01 Hourly Averages)

  8. 90th Percentile Comparison of O3 and NOx (June-01 Hourly Averages)

  9. Comparison of Average NOx and O3 June and August 2001

  10. Comparison of Average Temperature and O3 June and August 2001

  11. Wind Direction Trends • During the day: upslope, westerly • At night: direction is reversed

  12. Wind Direction and Ozone Mostly WNW Mostly West Mostly ENE

  13. Summerlin Residential Area Source: http://www.summerlin.com/home.html

  14. Ozone and NOx • Ozone loss by NOx catalyzed mechanism, not important in troposphere • Loss of NOx by conversion to HNO3 • HOx & NOx catalyze O3 production in troposphere • NO2 + h O2 NO + O3

  15. Sources of NOx Source: http://www.epa.gov/oar/oaqps/gooduphigh/#goodbad

  16. Tropospheric Loss of O3 O(1D) + H2O 2OH OH + O3 HO2 + O2 HO2 + O3 OH + 2O2

  17. A Box Model Las Vegas Summerlin FSL EL ES FLS LD + LCL LD + LCS Note: FLS >>>FSL winds are mostly to the west

  18. An Estimation in August • NOx production in LV = 823 tons/day • Average wind speed = 5.5 MPH • Summerlin = 15 miles • Ignoring all other losses and sources: • About 700 tons/day makes it to this station

  19. Conclusions • Correlation of Ozone with NOx • Correlation of Ozone with Temperature • NOx transportation from LV to PV

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