Ozone Trends in a Residential Area in Las Vegas, 2001
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Ozone Trends in a Residential Area in Las Vegas, 2001
Arsineh Hecobian
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Map of Monitoring Station
Source: http://www.mapquest.com
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http://major.ci.las-vegas.nv.us/website/clvcamps/viewer.htm
Monitoring Station
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Palo Verde Site
Palo Verde High School far western edge of valley- new construction, high O3, -suburban site
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DAQM Monitoring Stations
• DAQM operates fifteen sites to monitor Ozone
• DAQM operates eight sites to monitor the Oxides of Nitrogen
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Ozone Exceeding 8-h AQI StdDate Station O3 ppm
9 Aug 01 Joe Neal 0.085
10 Aug 01 Winterwood 0.085
Shadowlane 0.087
Lone Mt 0.090
Palo Verde 0.091
Paul Meyer 0.085
W. Johnson 0.092
Joe Neal 0.094
11 Aug 01 Lone Mt 0.088
Palo Verde 0.090
Source: DAQM, 2001 NAMS/SLAMS NETWORK REVIEW, 2001
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10th Percentile Comparison of O3 and NOx (June-01 Hourly Averages)
0.01
0.015
0.02
0.025
0.03
0.035
0.04
0.045
0.05
0.055
0:00 3:00 6:00 9:00 12:00 15:00 18:00 21:00 0:00
Hour
O3
ppm
0.005
0.006
0.007
0.008
0.009
0.01
0.011
0.012
0.013
0.014
NO
x pp
m
Ozone 10thNox 10th
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90th Percentile Comparison of O3 and NOx (June-01 Hourly Averages)
0
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0:00 3:00 6:00 9:00 12:00 15:00 18:00 21:00 0:00
Hour
O3
pp
m
0.04
0.045
0.05
0.055
0.06
0.065
0.07
0.075
0.08
NO
x p
pm
Nox 90th
Ozone 90th
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Comparison of Average NOx and O3 June and August 2001
June
0.03
0.035
0.04
0.045
0.05
0.055
0.06
0.065
0:00 3:00 6:00 9:00 12:00 15:00 18:00 21:00 0:00
Hour
O3 p
pm
0.005
0.01
0.015
0.02
0.025
0.03
0.035
NO
x p
pm
Ozone 50th
Nox 50th
August
0.025
0.03
0.035
0.04
0.045
0.05
0.055
0.06
0.065
0.07
0:00 3:00 6:00 9:00 12:00 15:00 18:00 21:00 0:00
H o u r
0.005
0.01
0.015
0.02
0.025
0.03
0.035
0.04
O3 Average
Nox Average
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Comparison of Average Temperature and O3 June and August 2001
June
70
75
80
85
90
95
100
0:00 3:00 6:00 9:00 12:00 15:00 18:00 21:00 0:00
Hour
O3 p
pm
0.03
0.035
0.04
0.045
0.05
0.055
0.06
0.065
Tem
p
oF
Temp Average
Ozone Average
August
0.025
0.03
0.035
0.04
0.045
0.05
0.055
0.06
0.065
0.07
0:00 3:00 6:00 9:00 12:00 15:00 18:00 21:00 0:00
Hour
O3 p
pm
75
80
85
90
95
100
Tem
p
oF
O3 Average
Temp Average
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Wind Direction Trends
• During the day: upslope, westerly
• At night: direction is reversed
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50
100
150
200
250
300
350
400
0:00 3:00 6:00 9:00 12:00 15:00 18:00 21:00 0:00
Hour
Win
d D
irect
ion
0.01
0.02
0.03
0.04
0.05
0.06
0.07
Wind Dir
Ozone ppm
Mostly WNW
Mostly ENE
Mostly West
Wind Direction and Ozone
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Source: http://www.summerlin.com/home.html
Summerlin Residential Area
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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
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Source: http://www.epa.gov/oar/oaqps/gooduphigh/#goodbad
Sources of NOx
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Tropospheric Loss of O3
O(1D) + H2O 2OH
OH + O3 HO2 + O2
HO2 + O3 OH + 2O2
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A Box Model
Summerlin Las Vegas
ELES
LD + LCS LD + LCL
FSL
FLS
Note: FLS >>>FSL winds are mostly to the west
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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
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Conclusions
• Correlation of Ozone with NOx
• Correlation of Ozone with Temperature
• NOx transportation from LV to PV