Weekend/Weekday Ozone Observations in the South Coast Air Basin

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2.8 2.6 Organic Nitrates 2.8 2.6 H2O2 (ppb) 2.4 2.4 log NOx (ppb) 2.2 2.0 1.8 1.6 1.4 A L U P L U P A 2 3 A 4 L 5 10 6 7 8 9 log NOx (ppb) 2.2 2.0 1.8 1.6 1.4 L P L U P A A U 2 L A 4 10 14 6 8 12 1.2 1 1.2 1.0 1.0 0.8 L A Los Angeles North Main 1987 Azusa 1987 0.8 L A Los Angeles North Main 1987 Azusa 1987 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 log VOC (ppbC) 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 log VOC (ppbC) 2.8 2.6 HNO3/H2O2 2.8 2.6 H2O2/HCHO 2.4 2.4 log NOx (ppb) 2.2 2.0 1.8 1.6 1.4 1.2 1.0 0.8 A L L U A P L U P A 90 10 1 L Los Angeles North Main 1987 A Azusa 1987 log NOx (ppb) 2.2 2.0 1.8 1.6 1.4 1.2 1.0 0.8 A L L U A P L U P A 0.04 0.08 0.12 0.16 0.32 0.28 0.20 0.24 0.36 L A Los Angeles North Main 0.40 1987 Azusa 1987 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 log VOC (ppbC) 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 log VOC (ppbC) Ozone (ppb) Figure 3.5-3 Plots of organic nitrates, H 2 O 2 , HNO 3 /H 2 O 2 ratio and H 2 O 2 /HCHO ratio superimposed on a color O 3 EKMA plot. Also plotted are mixing ratios for NO x and NMHC during the summer of 1999 and 2000 with error bars representing one standard deviation from the average with the labels (A) representing Azusa, (L) representing Los Angeles – North Main, (P) representing Pico Rivera and (U) representing Upland and the yellow squares representing Wednesday and the dark red dots representing Sunday. The error bars are not symmetrical because of the logarithmic scale. The two white dots labeled (L) and (A) represent the average conditions for Los Angeles – North Main and Azusa during 1987, respectively. 3-34
NO2 Photolysis Rate Parameter 0.35 0.30 0.25 0.20 0.15 0.10 0.05 Sundays NO2 Potolysis Rate Parameter 0.00 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Midweek HOUR (PDT) 0.00 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 HOUR (PDT) 80-85 86-90 91-94 95-98 99-00 Figure 3.6-1. Estimated mean photolysis rate parameter for NO 2 (J NO2 ) at Azusa on Sunday, and midweek (Tuesday to Thursday) for the periods 1980-85, 1986-90, 1991-94, 1995-98, and 1999- 2000. J NO2 was calculated from an extended version of the O 3 -NO-NO 2 photostationary state expression. 3-35
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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.
Page 79 and 80: 160 1981-84 120 80 40 0 160 Sun Mon
Page 81 and 82: 5.0 1981-84 4.0 3.0 2.0 1.0 0.0 5.0
Page 83 and 84: 12.00 1981-84 11.00 10.00 9.00 8.00
Page 85 and 86: NMHC (ppbC) 1000 800 600 400 200 4-
Page 87 and 88: 10.00 1981-84 8.00 6.00 4.00 2.00 0
Page 89 and 90: Sunday 1981-84 Time (PDT) 16 15 14
Page 91 and 92: 16 Sunday 1990-94 35 Time (PDT) 15
Page 93 and 94: 40 Sunday O3 Accumulation Rate (ppb
Page 95 and 96: 15.0 1981-84 12.0 9.0 6.0 3.0 0.0 1
Page 97 and 98: 3. CHARACTERIZATION OF THE CURRENT
Page 99 and 100: 3.2 Weekday Differences in Diurnal
Page 101 and 102: timing hypothesis, which requires a
Page 103 and 104: through the conversion of NO to NO
Page 105 and 106: Weekday Differences in Diurnal Vari
Page 107 and 108: activity including [HNO 3 ]/[H 2 O
Page 109 and 110: Table 3.2-1 Day-of-the-Week Variati
Page 115 and 116: Table 3.3-1b Day-of-the-Week Differ
Page 117 and 118: 120 Los Angeles - N. Main - Saturda
Page 119 and 120: 160 140 Upland - Saturdays mean Ozo
Page 121 and 122: maximum 1hour ozone (ppb) 100 90 80
Page 123 and 124: NMHC/NOx ratio 14 12 10 8 6 4 2 0 S
Page 125 and 126: Los Angeles - N. Main Azusa 140 140
Page 127 and 128: Los Angeles - N. Main Azusa 140 140
Page 129: 2.8 2.6 PAN (ppb) 2.8 2.6 HCHO (ppb
Page 133 and 134: 4. WEEKDAY VARIATIONS IN THE SOURCE
Page 135 and 136: 9 a.m. andnoon. Sampling was conduc
Page 137 and 138: interfaced to an Entech model 7100
Page 139 and 140: values measured at the regional sit
Page 141 and 142: into a category named "UNID." The s
Page 143 and 144: more than a few percent of the tota
Page 145 and 146: period, the amount of NOx associate
Page 147 and 148: 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
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NMOG/NOx Ratios at Azusa 20 15 02-0
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estimated contribution by source (u
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500 Nonmethane Hydrocarbons 400 NMH
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5 Azusa, Weekdays 6-9 a.m (10/2/00-
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2.0 Azusa, Weekdays 6-9 a.m (10/2/0
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Pico Rivera 150 120 BC-Associated C
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Nitrogen Oxides 800.00 700.00 600.0
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5. REFERENCES Altshuler, S.L., T.D.
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Fujita, E.M., J.G. Watson, J.C. Cho
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Roberts, J.M. (1983) Measurements o
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Weekend/Weekday Ozone Observations in the South Coast Air Basin

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