Weekend/Weekday Ozone Observations in the South Coast Air Basin

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NO 2 /NOx 0.70 0.60 0.50 0.40 ave81-84 ave85-89 ave90-94 0.30 ave95-98 0.20 0.10 0.00 Sun Mon Tue Wed Thu Fri Sat Figure 1.4-6. Twelve-site average NO 2 /NOx ratios at 7-8 a.m. (PDT) by day of the week. 1-30
5 Sunday - Wednesday (1981-84) 10 Time Change (hours) 4 3 2 1 0 -1 -2 N. Long Beach Anaheim Lynwood LA- N.Main Reseda Burbank Pico Rivera La Habra Azusa Pomona Upland Rubidoux 8 6 4 2 0 -2 -4 -6 -8 -10 Rate Change (ppb/hr) Time Change (hours) 5 4 3 2 1 0 -1 -2 N. Long Beach Anaheim Lynwood LA- N.Main Sunday - Wednesday (1985-89) Reseda Burbank Pico Rivera La Habra Azusa Pomona Upland Rubidoux 10 8 6 4 2 0 -2 -4 -6 -8 -10 Rate Change (ppb/hr) Time Change (hours) 5 4 3 2 1 0 -1 -2 N. Long Beach Anaheim Lynwood LA- N.Main Sunday - Wednesday (1990-94) Reseda Burbank Pico Rivera La Habra Azusa Pomona Upland Rubidoux 10 8 6 4 2 0 -2 -4 -6 -8 -10 Rate Change (ppb/hr) Sunday - Wednesday (1995-98) Time Change (hours) 5 4 3 2 1 0 -1 -2 N. Long Beach Anaheim Lynwood LA- N.Main Reseda Burbank Pico Rivera La Habra Azusa Pomona Upland Rubidoux 10 8 6 4 2 0 -2 -4 -6 -8 -10 Rate Change (ppb/hr) Differences in duration of ozone accumulation period Differences in ozone accumulation rate Figure 1.4-7. Sunday versus Wednesday differences in duration and rate of ozone accumulation for twelve sites in the SoCAB during 1981-84, 1985-89, 1990-94, and 1995-98. Sites are arranged in order of location from west to east with the western sites toward the left side of the plot. 1-31
Page 1 and 2: WEEKEND/WEEKDAY OZONE OBSERVATIONS
Page 3 and 4: obtained by DRI from the Phase II f
Page 5 and 6: TABLE OF CONTENTS Preface..........
Page 7 and 8: Table No. Table 1.4-1 Table 1.4-2 T
Page 9 and 10: periods by day-of-week at Los Angel
Page 11 and 12: Figure 1.4-13. Hourly average nitro
Page 13 and 14: Figure 3.1-2 Mean day-of-the-week v
Page 15 and 16: Figure 4.4-1b. Mean estimated sourc
Page 17 and 18: 1. STUDY PERSPECTIVE AND SUMMARY Th
Page 19 and 20: 40 percent. Consequently, the contr
Page 21 and 22: dioxide (NO 2 ) 4 , and carbon mono
Page 23 and 24: and upwind samples before and after
Page 25 and 26: where J 1 is the photolysis frequen
Page 27 and 28: transported from an urban center to
Page 29 and 30: of the week on Friday and Saturday.
Page 31 and 32: VOC reactivity, photochemical aging
Page 33 and 34: corresponding source attributions a
Page 35 and 36: multiplicative constant. This const
Page 37 and 38: Table 1.4-1 Trends in Duration and
Page 39 and 40: Table 1.4-3 Regression Statistics f
Page 41 and 42: O 3 Ozone Formation Chemistry NO 2
Page 43 and 44: 200 1981-84 200 1995-98 160 160 120
Page 45: 100 NO 1000 NMHC (estimated from CO
Page 49 and 50: 10.0 8.0 NMHC/NOx 6.0 4.0 2.0 0.0 S
Page 51 and 52: Ratio of Peak Ozone to Potential Oz
Page 53 and 54: Nitrogen Oxides at Azusa, 9/30/00 t
Page 55 and 56: Ambient NOx Associated with CO and
Page 57 and 58: Source Contribution Estimate (ug/m3
Page 59 and 60: 2.8 2.6 Ozone (ppb) 2.4 log NOx (pp
Page 61 and 62: 2. EVOLUTION OF THE OZONE EFFECT IN
Page 63 and 64: the SoCAB has dropped sharply as sh
Page 65 and 66: the duration of ozone accumulation,
Page 67 and 68: • NO 2 concentrations and NO 2 /N
Page 69 and 70: Table 2-1 Air Quality Parameters fo
Page 71 and 72: 0.18 Azusa, Summer 1995 12.0 0.15 1
Page 73 and 74: 250 200 150 100 50 0 1976 1977 1978
Page 75 and 76: 80 1981-84 60 40 20 0 80 Sun Mon Tu
Page 77 and 78: 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 111 and 112:
Page 113 and 114:
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
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9 a.m. andnoon. Sampling was conduc
Page 137 and 138:
interfaced to an Entech model 7100
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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
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• 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 193 and 194:
Page 195 and 196:
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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