Weekend/Weekday Ozone Observations in the South Coast Air Basin

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Table 4.4-3b Source Contribution Estimates (µg/m 3 ) for Mobile Van Samples Date Sample ID Gasoline Exhaust Diesel Exhaust Gasoline Vapor CNG LPG Surface Coatings Consumer Products Unexplained Mon, 10/2/00 IH1 72.10 4.57 10.09 9.07 10.11 2.83 3.64 1.80 CV1 102.70 12.12 10.81 9.90 8.96 3.69 6.22 8.13 DS1 30.49 5.06 2.43 12.76 4.08 0.91 4.78 0.67 CO1 182.37 4.59 0.58 49.30 HF1 221.99 5.17 5.11 1.36 3.56 1.32 1.37 0.00 DS2 197.84 3.62 7.34 2.23 6.67 2.05 3.49 15.15 CO2 227.45 16.10 19.57 1.06 19.43 13.85 24.88 CV2 146.14 20.95 11.96 2.47 9.60 2.80 9.15 3.08 IH2 NA NA NA NA NA NA NA NA PO1 101.03 33.74 17.53 2.88 7.75 2.58 3.11 Wed, 10/4/00 IH1 37.82 3.95 7.25 2.54 3.86 2.80 4.34 4.79 CV1 42.85 7.76 5.80 2.97 3.43 3.13 4.40 5.50 DS1 32.78 8.49 7.12 6.08 3.48 3.88 4.83 0.31 CO1 165.29 13.14 15.31 1.19 5.44 2.73 4.65 19.12 HF1 160.46 5.60 10.57 20.00 5.17 4.32 8.25 DS2 192.49 5.73 11.02 2.36 6.57 2.69 6.93 2.27 CO2 281.46 38.06 25.61 11.98 6.90 2.04 5.18 7.12 CV2 157.08 15.09 5.97 4.67 2.52 2.72 13.71 IH2 55.46 4.33 6.08 1.24 6.77 2.76 7.32 PO1 84.20 20.48 0.55 0.04 5.16 1.33 2.42 14.86 Sat, 10/7/00 IH1 117.92 7.15 12.17 6.57 8.39 7.66 8.27 CV1 115.23 7.13 9.86 5.82 7.39 3.49 9.12 0.54 DS1 27.02 1.98 5.51 12.35 2.87 0.32 5.06 3.39 CO1 118.72 3.45 8.43 3.27 5.03 1.29 3.59 9.17 HF1 148.60 0.32 4.38 7.57 1.93 0.01 3.73 4.56 DS2 104.70 2.17 4.36 7.19 4.24 0.55 6.50 4.23 CO2 174.93 11.02 10.00 3.40 8.83 4.67 6.75 11.01 CV2 156.61 8.82 9.55 3.81 9.04 4.03 4.78 7.97 IH2 51.88 6.35 6.70 5.04 6.41 4.18 5.77 PO1 146.48 10.29 6.06 0.56 5.97 1.53 4.69 4.57 Sun, 10/8/00 IH1 90.02 8.22 14.93 7.66 9.82 6.53 9.91 CV1 226.08 12.98 10.48 14.08 7.81 8.88 10.28 64.49 DS1 161.61 7.98 12.35 13.24 3.95 9.26 9.22 CO1 281.55 12.27 49.80 39.38 25.61 19.38 25.41 HF1 193.34 10.36 10.47 13.86 4.92 17.23 6.06 DS2 170.97 10.08 10.71 12.73 5.81 9.43 7.47 CO2 227.84 14.64 23.99 12.14 12.54 8.69 12.12 6.66 CV2 141.92 2.70 13.19 5.66 7.54 4.88 6.18 7.92 IH2 39.61 5.79 8.71 7.12 5.61 2.74 7.26 PO1 120.70 4.65 10.93 3.49 5.91 1.62 6.44 1.69 Tue, 10/3/00 TSD 122.60 42.96 7.84 4.49 7.51 8.32 5.71 5.48 TS1 95.42 71.84 9.90 6.75 9.78 3.70 4.71 TS2 82.26 47.25 14.57 7.97 9.89 4.44 9.05 3.77 TS3 87.72 49.88 13.99 7.22 11.95 6.26 10.64 11.61 TSU 71.74 14.68 17.88 8.19 11.13 5.44 10.89 18.52 Fri, 10/6/00 SC 399.01 5.93 11.01 11.31 10.22 12.15 25.84 CS 400.54 14.20 21.20 29.54 8.60 13.02 15.99 DH 143.97 13.86 15.42 9.66 5.46 5.95 4.15 DL 238.29 12.08 19.86 8.98 7.67 13.51 PS 165.92 13.32 11.54 7.54 9.40 12.04 MH 141.47 9.70 14.82 22.90 16.93 6.01 20.76 4-30
Table 4.4-3c Source Contribution Estimates (Percent) for Mobile Van Samples Date Sample ID Gasoline Exhasut Diesel Exhaust Gasoline Vapor CNG LPG Surface Coatings Consumer Products Unexplained Mon, 10/2/00 IH1 64.14 4.07 8.98 8.07 8.99 2.52 3.24 1.60 CV1 66.52 7.85 7.00 6.41 5.80 2.39 4.03 5.26 DS1 50.38 8.37 4.02 21.09 6.74 1.50 7.90 1.12 CO1 97.17 0.00 0.00 0.00 2.44 0.00 0.31 26.27 HF1 92.54 2.15 2.13 0.57 1.49 0.55 0.57 0.00 DS2 88.62 1.62 3.29 1.00 2.99 0.92 1.56 6.79 CO2 76.43 5.41 6.58 0.36 6.53 0.00 4.66 8.36 CV2 71.89 10.31 5.88 1.21 4.72 1.38 4.50 1.51 IH2 NA NA NA NA NA NA NA NA PO1 60.87 20.33 10.56 1.73 4.67 0.00 1.56 1.87 Wed, 10/4/00 IH1 60.46 6.32 11.59 4.06 6.17 4.47 6.93 7.66 CV1 60.91 11.03 8.25 4.22 4.87 4.45 6.26 7.82 DS1 49.17 12.73 10.68 9.12 5.23 5.82 7.25 0.46 CO1 79.55 6.32 7.37 0.57 2.62 1.31 2.24 9.20 HF1 74.85 2.61 4.93 9.33 2.41 2.01 3.85 0.00 DS2 84.50 2.52 4.84 1.04 2.89 1.18 3.04 1.00 CO2 75.79 10.25 6.90 3.23 1.86 0.55 1.40 1.92 CV2 83.53 8.02 3.17 0.00 2.49 1.34 1.44 7.29 IH2 66.06 5.15 7.24 1.48 8.07 3.28 8.72 0.00 PO1 73.70 17.93 0.48 0.04 4.52 1.16 2.12 13.00 Sat, 10/7/00 IH1 70.13 4.25 7.24 3.91 4.99 4.56 4.92 0.00 CV1 72.92 4.51 6.24 3.68 4.67 2.21 5.77 0.34 DS1 49.02 3.59 9.99 22.41 5.22 0.59 9.17 6.16 CO1 82.57 2.40 5.86 2.27 3.50 0.90 2.49 6.38 HF1 89.22 0.19 2.63 4.55 1.16 0.00 2.24 2.74 DS2 80.73 1.67 3.36 5.54 3.27 0.42 5.01 3.26 CO2 79.66 5.02 4.55 1.55 4.02 2.13 3.07 5.01 CV2 79.64 4.49 4.86 1.94 4.60 2.05 2.43 4.05 IH2 60.03 7.35 7.75 5.84 7.42 4.84 6.68 0.00 PO1 83.39 5.86 3.45 0.32 3.40 0.87 2.67 2.60 Sun, 10/8/00 IH1 61.20 5.59 10.15 5.21 6.68 4.44 6.74 0.00 CV1 77.80 4.47 3.61 4.84 2.69 3.06 3.54 22.19 DS1 74.26 3.67 5.67 6.08 1.82 4.25 4.24 0.00 CO1 62.10 2.71 10.98 8.69 5.65 4.27 5.60 0.00 HF1 75.44 4.04 4.08 5.41 1.92 6.72 2.37 0.00 DS2 75.25 4.44 4.71 5.60 2.56 4.15 3.29 0.00 CO2 73.03 4.69 7.69 3.89 4.02 2.78 3.88 2.14 CV2 77.91 1.48 7.24 3.11 4.14 2.68 3.39 4.35 IH2 51.54 7.54 11.34 9.27 7.30 3.57 9.44 0.00 PO1 78.49 3.03 7.11 2.27 3.84 1.05 4.18 1.10 Tue, 10/3/00 TSD 61.48 21.54 3.93 2.25 3.77 4.17 2.86 2.75 TS1 47.21 35.55 4.90 3.34 4.84 1.83 2.33 0.00 TS2 46.89 26.93 8.31 4.54 5.64 2.53 5.16 2.15 TS3 46.74 26.58 7.46 3.85 6.37 3.33 5.67 6.19 TSU 51.26 10.49 12.78 5.85 7.95 3.89 7.78 13.23 Fri, 10/6/00 SC 88.74 1.32 2.45 0.00 2.51 2.27 2.70 5.75 CS 82.23 2.92 4.35 0.00 6.06 1.76 2.67 3.28 DH 74.09 7.13 7.94 0.00 4.97 2.81 3.06 2.14 DL 79.33 4.02 6.61 0.00 2.99 2.55 4.50 0.00 PS 75.50 6.06 5.25 0.00 3.43 4.28 5.48 0.00 MH 60.82 4.17 6.37 9.84 7.28 2.58 8.93 0.00 4-31
Page 1 and 2:
WEEKEND/WEEKDAY OZONE OBSERVATIONS
Page 3 and 4:
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
Page 111 and 112: Table 3.2-3 Day-of-the-Week Variati
Page 113 and 114: Table 3.2-5 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 and 130: 2.8 2.6 PAN (ppb) 2.8 2.6 HCHO (ppb
Page 131 and 132: NO2 Photolysis Rate Parameter 0.35
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: Table 4.4-3a CMB Performance Parame
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 and 200: Nitrogen Oxides 800.00 700.00 600.0
Page 201 and 202: 5. REFERENCES Altshuler, S.L., T.D.
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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