Weekend/Weekday Ozone Observations in the South Coast Air Basin

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Table 3.4-1. Initial Chemical Conditions for Model Simulations with Varying NOx and NMHC _______________________________________________________________________ Inorganic Species Species Concentration ppbv _______________________________________________________________________ Ozone 30 Methane 1700 Water 1.56 x 10 7 Carbon Monoxide 100 (Rural); 1000 (Urban) Sulfur Dioxide 1 _______________________________________________________________________ _______________________________________________________________________ Organic Species Background NMHC Anthropogenic NMHC and Other Organics and Other Organics ppbC Percent by Carbon _______________________________________________________________________ Ethane 2 11.5 Least Reactive Alkanes 4 27.5 Moderately Reactive Alkanes 14 17 Very Reactive Alkanes 10 12 Ethene 1 8 Terminal Alkenes 0.6 5 Internal Alkenes 1.6 2 Toluene 0.7 8 Xylene 0.4 4.5 Formaldehyde 2 1 Aldehyde 2 1 Ketone 3.5 2 Isoprene 2.5 ---- Peroxyacetyl Nitrate 2 ---- _______________________________________________________________________ 3-20
120 Los Angeles - N. Main - Saturdays 100 mean Ozone (ppb) 80 60 40 80-85 86-90 91-94 95-98 99-00 20 0 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) 120 Sundays 100 mean Ozone (ppb) 80 60 40 80-85 86-90 91-94 95-98 99-00 20 0 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) 120 Midweek (Tues-Thur) 100 mean Ozone (ppb) 80 60 40 80-85 86-90 91-94 95-98 99-00 20 0 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) Figure 3.1-1a. Mean diurnal variations in ozone mixing ratios on Saturdays, Sundays, and weekdays at Los Angeles – North Main in 1999-2000 and 1980-1998. 3-21
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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
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 115: Table 3.3-1b Day-of-the-Week Differ
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 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
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800 700 600 Wednesday NO and NOy (p
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Estimated NOx Estimated NOx (ppb) 5
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VOC/NOx Ratios 6.0 5.0 4.0 Mon, 10/
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Nitrogen Oxides at Azusa 80 60 02-0
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Nitrogen Oxides at Pico Rivera 180
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Nonmethane Organic Gas at Azusa 500
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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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