Weekend/Weekday Ozone Observations in the South Coast Air Basin

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100% Nitrogen Oxides 80% 60% 40% 20% 0% IH1 CV1 DS1 CO1 HF1 DS2 CO2 CV2 IH2 PO1 IH1 CV1 DS1 CO1 HF1 DS2 CO2 CV2 IH2 PO1 IH1 CV1 DS1 CO1 HF1 DS2 CO2 CV2 IH2 PO1 IH1 CV1 DS1 CO1 HF1 DS2 CO2 CV2 IH2 PO1 NOx (ug/m3) Mon, 10/2 Wed, 10/4 Sat, 10/7 Sun, 10/8 Gasoline Exhasut Diesel Exhaust Figure 4.5-9. Source apportionment of NOx for mobile sampling loops and regional background sites – percent contributions. 4-68
5. REFERENCES Altshuler, S.L., T.D. Arcado, and D.R. Lawson. (1995). Weekend vs. Weekday Ambient Ozone Concentrations: Discussion and Hypotheses with Focus on Northern California. J. Air Waste Manage. Assoc., 45, 967-972. California Air Resources Board (2001). The Ozone Weekend Effect in California. Draft report prepared by the Planning and Technical Support Division and Research Division, California Air Resources Board, Sacramento, CA, August 2001 Arnts, R.R and S.A. Meeks. (1981). Biogenic Hydrocarbon Contribution to the Ambient Air of Selected Areas. Atmos. Environ., 15, 1643. Austin, J. and H. Tran (1999). A Characterization of the Weekend-Weekday Behavior of Ambient Oaonce Concentrations in California. Technical Support and Planning Division, California Air Resources Board, Sacramento, CA. Blanchard, C.L. and S. Tanenbaum (2000). Data Analysis Complementing Proximate Modeling of the Weekday/Weekend Ozone Differences in Southern California. Final report prepared by Envair for the Coordinating Research Council, Alpharetta, GA (CRC Contract No. A-36A-2) and the National Renewable Energy Laboratory, Golden, CO. Blier, W., A.M. Winer, D. Hansen and N. Verma (1996). Characterization of Ozone Episodes in the South Coast Air Basin: Effects of air Parcel Residence Time and Weekend/Weekday Differences. Final report prepared by the Department of Atmospheric Sciences and Environmental Science and Engineering, University of California, Los Angeles for the California Air Resources Board, Sacramento CA, under contract No. 93-316. Blier, W., A.M. Winer, D. Hansen and R. Chavira (1999). Analysis of Weekday/Weekend Differences in Ambient Air Quality and Meteorology in the South Coast Air Basin. Final report prepared by the Department of Atmospheric Sciences and Environmental Science and Engineering, University of California, Los Angeles for the California Air Resources Board, Sacramento CA, under contract No. 95-334. Carter W. P. L. and F. W. Lurmann. (1989). Evaluation of the RADM Gas-Phase Chemical Mechanism. U.S. Environmental Protection Agency Cooperative Agreement No. CR- 814558-01-0. Statewide Air Pollution Research Center, University of California, Riverside, CA. Carter, W. P. L. (1994): “Development of Ozone Reactivity Scales for Volatile Organic Compounds,” J. Air & Waste Manage. Assoc., 44, 881-899. Censullo A.C., D.R. Jones, and M.T. Wills (1996). Improvement of speciation profiles for architectural and industrial maintenance coating operations. Final Report prepared for California Air Resources Board, Sacramento, CA, California Polytechnic State University, San Luis Obispo, CA, 1996. 5-1
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WEEKEND/WEEKDAY OZONE OBSERVATIONS
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obtained by DRI from the Phase II f
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TABLE OF CONTENTS Preface..........
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Table No. Table 1.4-1 Table 1.4-2 T
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periods by day-of-week at Los Angel
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Figure 1.4-13. Hourly average nitro
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Figure 3.1-2 Mean day-of-the-week v
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Figure 4.4-1b. Mean estimated sourc
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1. STUDY PERSPECTIVE AND SUMMARY Th
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40 percent. Consequently, the contr
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dioxide (NO 2 ) 4 , and carbon mono
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and upwind samples before and after
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where J 1 is the photolysis frequen
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transported from an urban center to
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of the week on Friday and Saturday.
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VOC reactivity, photochemical aging
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corresponding source attributions a
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multiplicative constant. This const
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Table 1.4-1 Trends in Duration and
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Table 1.4-3 Regression Statistics f
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O 3 Ozone Formation Chemistry NO 2
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200 1981-84 200 1995-98 160 160 120
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100 NO 1000 NMHC (estimated from CO
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5 Sunday - Wednesday (1981-84) 10 T
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10.0 8.0 NMHC/NOx 6.0 4.0 2.0 0.0 S
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Ratio of Peak Ozone to Potential Oz
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Nitrogen Oxides at Azusa, 9/30/00 t
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Ambient NOx Associated with CO and
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Source Contribution Estimate (ug/m3
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2.8 2.6 Ozone (ppb) 2.4 log NOx (pp
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2. EVOLUTION OF THE OZONE EFFECT IN
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the SoCAB has dropped sharply as sh
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the duration of ozone accumulation,
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• NO 2 concentrations and NO 2 /N
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Table 2-1 Air Quality Parameters fo
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0.18 Azusa, Summer 1995 12.0 0.15 1
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250 200 150 100 50 0 1976 1977 1978
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80 1981-84 60 40 20 0 80 Sun Mon Tu
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1.00 1981-84 0.80 0.60 0.40 0.20 0.
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160 1981-84 120 80 40 0 160 Sun Mon
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5.0 1981-84 4.0 3.0 2.0 1.0 0.0 5.0
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12.00 1981-84 11.00 10.00 9.00 8.00
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NMHC (ppbC) 1000 800 600 400 200 4-
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10.00 1981-84 8.00 6.00 4.00 2.00 0
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Sunday 1981-84 Time (PDT) 16 15 14
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16 Sunday 1990-94 35 Time (PDT) 15
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40 Sunday O3 Accumulation Rate (ppb
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15.0 1981-84 12.0 9.0 6.0 3.0 0.0 1
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3. CHARACTERIZATION OF THE CURRENT
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3.2 Weekday Differences in Diurnal
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timing hypothesis, which requires a
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through the conversion of NO to NO
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Weekday Differences in Diurnal Vari
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activity including [HNO 3 ]/[H 2 O
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Table 3.2-1 Day-of-the-Week Variati
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Table 3.3-1b Day-of-the-Week Differ
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120 Los Angeles - N. Main - Saturda
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160 140 Upland - Saturdays mean Ozo
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maximum 1hour ozone (ppb) 100 90 80
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NMHC/NOx ratio 14 12 10 8 6 4 2 0 S
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Los Angeles - N. Main Azusa 140 140
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Los Angeles - N. Main Azusa 140 140
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2.8 2.6 PAN (ppb) 2.8 2.6 HCHO (ppb
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NO2 Photolysis Rate Parameter 0.35
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4. WEEKDAY VARIATIONS IN THE SOURCE
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9 a.m. andnoon. Sampling was conduc
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interfaced to an Entech model 7100
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values measured at the regional sit
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into a category named "UNID." The s
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more than a few percent of the tota
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period, the amount of NOx associate
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weekend/weekday differences during
Page 149 and 150: • Day-of-the-week changes in the
Page 151 and 152: Table 4.4-1 Default Source Composit
Page 153 and 154: Table 4.4-1a Number of observations
Page 155 and 156: Table 4.4-1c Number of observations
Page 157 and 158: Table 4.4-2a Number of observations
Page 159 and 160: Table 4.4-2c Number of observations
Page 161 and 162: Table 4.4-3a CMB Performance Parame
Page 163 and 164: Table 4.4-3c Source Contribution Es
Page 165 and 166: Table 4.5-2 Weekend/Weekday Differe
Page 167 and 168: 800 700 600 Wednesday NO and NOy (p
Page 169 and 170: Estimated NOx Estimated NOx (ppb) 5
Page 171 and 172: VOC/NOx Ratios 6.0 5.0 4.0 Mon, 10/
Page 173 and 174: Nitrogen Oxides at Azusa 80 60 02-0
Page 175 and 176: Nitrogen Oxides at Pico Rivera 180
Page 177 and 178: Nonmethane Organic Gas at Azusa 500
Page 179 and 180: Nonmethane Organic Gas at Pico Rive
Page 181 and 182: NMOG/NOx Ratios at Azusa 20 15 02-0
Page 183 and 184: estimated contribution by source (u
Page 185 and 186: 500 Nonmethane Hydrocarbons 400 NMH
Page 187 and 188: 5 Azusa, Weekdays 6-9 a.m (10/2/00-
Page 189 and 190: 2.0 Azusa, Weekdays 6-9 a.m (10/2/0
Page 191 and 192: Ambient NOx Associated with CO and
Page 197 and 198: Pico Rivera 150 120 BC-Associated C
Page 199: Nitrogen Oxides 800.00 700.00 600.0
Page 203 and 204: Fujita, E.M., J.G. Watson, J.C. Cho
Page 205 and 206: Roberts, J.M. (1983) Measurements o
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Weekend/Weekday Ozone Observations in the South Coast Air Basin

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