Weekend/Weekday Ozone Observations in the South Coast Air Basin

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VOC/NOx Ratios at Azusa, 9/30/00 to 10/8/00 25 20 NMOG/NOx NMHC/NOx VOC/NOx Ratios 15 10 5 0 0:00 6:00 12:00 18:00 0:00 6:00 12:00 18:00 0:00 6:00 12:00 18:00 0:00 6:00 12:00 18:00 0:00 6:00 12:00 18:00 0:00 6:00 12:00 18:00 0:00 6:00 12:00 18:00 0:00 6:00 12:00 18:00 0:00 6:00 12:00 18:00 Sat, 9/30 Sun, 10/1 Mon, 10/2 Tue, 10/3 Wed, 10/4 Thu, 10/5 Fri, 10/6 Sat, 10/7 Sun, 10/8 VOC/NOx Ratios at Pico Rivera, 9/30/00 to 10/8/00 25 20 NMOG/NOx VOC/NOx Ratios 15 10 5 0 0:00 6:00 12:00 18:00 0:00 6:00 12:00 18:00 0:00 6:00 12:00 18:00 0:00 6:00 12:00 18:00 0:00 6:00 12:00 18:00 0:00 6:00 12:00 18:00 0:00 6:00 12:00 18:00 0:00 6:00 12:00 18:00 0:00 6:00 12:00 18:00 Sat, 9/30 Sun, 10/1 Mon, 10/2 Tue, 10/3 Wed, 10/4 Thu, 10/5 Fri, 10/6 Sat, 10/7 Sun, 10/8 Figure 4.3-9a. . VOC/NOx ratios at Azusa and Pico Rivera September 30-October 8, 2000. 4-48
NMOG/NOx Ratios at Azusa 20 15 02-04 06-09 09-12 NMOG/NOx 10 5 0 Sat Sun Mon Tue Wed Fri Sat Sun 9/30 10/1 10/2 10/3 10/4 10/6 10/7 10/8 NMOG/NOx Ratios at Pico Rivera 20 15 02-04 06-09 09-12 NMOG/NOx 10 5 0 Sat Sun Mon Tue Wed Fri Sat Sun 9/30 10/1 10/2 10/3 10/4 10/6 10/7 10/8 Figure 4.3-9b. Average VOC/NOx ratios at Azusa and Pico Rivera dur<strong>in</strong>g carryover, accumulation, and <strong>in</strong>hibition periods September 30-October 8, 2000. 4-49
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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
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 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: Nonmethane Organic Gas at Pico Rive
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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