Weekend/Weekday Ozone Observations in the South Coast Air Basin

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Table 4.1-1 Average ambient concentrations of NO, NOy, CO, MTBE, black carbon, heavy hydrocarbons, and VOC during the carryover, inhibition, and accumulation periods by day: October 2 - October 18, 2000 ............................ 4-18 Table 4.4-1 Default Source Composition Profiles Used in CMB Source Apportionment.... 4-19 Table 4.4-1a Number of observations, mean measured NMHC (ug/m 3 ), mean CMB performance parameters and mean estimated source contributions (ug/m3 ) +/- standard deviation; during the carryover (3:00-6:00), inhibition (6:00-9:00), accumulation (9:00-12:00), and peak ozone (12:00-15:00) periods by day-of-week at Azusa for summers 1999 and 2000......................... 4-21 Table 4.4-1b Number of observations, mean measured NMHC (ug/m 3 ), mean CMB performance parameters and mean estimated source contributions (ug/m3 ) +/- standard deviation; during the carryover (3:00-6:00), inhibition (6:00-9:00), accumulation (9:00-12:00), and peak ozone (12:00-15:00) periods by day-of-week at Pico Rivera for summer 1999 ................................. 4-22 Table 4.4-1c Number of observations, mean measured NMHC (ug/m 3 ), mean CMB performance parameters and mean estimated source contributions (ug/m3 ) +/- standard deviation; during the carryover (3:00-6:00), inhibition (6:00-9:00), accumulation (9:00-12:00), and peak ozone (12:00-15:00) periods by day-of-week at Upland for summers 1999 and 2000....................... 4-23 Table 4.4-1d Number of observations, mean measured NMHC (ug/m 3 ), mean CMB performance parameters and mean estimated source contributions (ug/m3 ) +/- standard deviation; during the carryover (3:00-6:00), inhibition (6:00-9:00), accumulation (9:00-12:00), and peak ozone (12:00-15:00) periods by day-ofweek at Los Angeles N. Main for summers 1999 and 2000.............................. 4-24 Table 4.4-2a Number of observations, mean measured NMHC (ug/m 3 ), mean CMB performance parameters and mean estimated source contributions (% of NMHC ) +/- standard deviation; during the carryover (3:00-6:00), inhibition (6:00-9:00), accumulation (9:00-12:00), and peak ozone (12:00-15:00) periods by day-of-week at Azusa for summers 1999 and 2000......................... 4-25 Table 4.4-2b Number of observations, mean measured NMHC (ug/m 3 ), mean CMB performance parameters and mean estimated source contributions (% of NMHC ) +/- standard deviation; during the carryover (3:00-6:00), inhibition (6:00-9:00), accumulation (9:00-12:00), and peak ozone (12:00-15:00) periods by day-of-week at Pico Rivera for summer 1999 ................................. 4-26 Table 4.4-2c Number of observations, mean measured NMHC (ug/m 3 ), mean CMB performance parameters and mean estimated source contributions (% of NMHC ) +/- standard deviation; during the carryover (3:00-6:00), inhibition (6:00-9:00), accumulation (9:00-12:00), and peak ozone (12:00-15:00) periods by day-of-week at Upland for summers 1999 and 2000....................... 4-27 Table 4.4-2d Number of observations, mean measured NMHC (ug/m 3 ), mean CMB performance parameters and mean estimated source contributions (% of NMHC ) +/- standard deviation; during the carryover (3:00-6:00), inhibition (6:00-9:00), accumulation (9:00-12:00), and peak ozone (12:00-15:00) viii
periods by day-of-week at Los Angeles N. Main for summers 1999 and 2000.................................................................................................................... 4-28 Table 4.4-3a CMB Performance Parameters for Mobile Van Samples.................................. 4-29 Table 4.4-3b Source Contribution Estimates (µg/m 3 ) for Mobile Van Samples..................... 4-30 Table 4.4-3c Source Contribution Estimates (Percent) for Mobile Van Samples .................. 4-31 Table 4.5-1 Table 4.5-2 Ambient NOx (ppb) Associated with CO and Black Carbon at On-Road and Regional Locations in the SoCAB .............................................................. 4-32 Weekend/Weekday Differences in Ambient NOx Associated with CO and Black Carbon in the SoCAB ....................................................................... 4-33 ix
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: Table No. Table 1.4-1 Table 1.4-2 T
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 and 46: 100 NO 1000 NMHC (estimated from CO
Page 47 and 48: 5 Sunday - Wednesday (1981-84) 10 T
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
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the duration of ozone accumulation,
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• 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
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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
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
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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
Page 99 and 100:
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:
Page 113 and 114:
Page 115 and 116:
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
Page 123 and 124:
NMHC/NOx ratio 14 12 10 8 6 4 2 0 S
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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
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4. WEEKDAY VARIATIONS IN THE SOURCE
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9 a.m. andnoon. Sampling was conduc
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interfaced to an Entech model 7100
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values measured at the regional sit
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into a category named "UNID." The s
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more than a few percent of the tota
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period, the amount of NOx associate
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weekend/weekday differences during
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• Day-of-the-week changes in the
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Table 4.4-1 Default Source Composit
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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
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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
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-
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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