Weekend/Weekday Ozone Observations in the South Coast Air Basin

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Figure 2.4-3. Average daily 7-8 a.m. (PDT) CO (ppm) in the SoCAB by day of the week. . 2-21 Figure 2.4-4. Average daily 7-8 a.m. (PDT) NMHC (ppbC) in the SoCAB by day of the week. ........................................................................................................ 2-22 Figure 2.4-5. Average time (PDT) in the morning when NO equals O 3 by day of the week. ........................................................................................................... 2-23 Figure 2.4-6. Twelve-site average NO 2 /NOx ratios at 7-8 a.m. (PDT) by day of the week. ........................................................................................................... 2-24 Figure 2.4-7. Twelve-site average NMHC and NO concentrations at 4-5 a.m. (PDT) and 7-8 a.m. (PDT) by day of the week. .......................................................... 2-25 Figure 2.5-1. Average time (PDT) at maximum O 3 by day of the week................................. 2-26 Figure 2.5-2. Duration (hours) of ozone accumulation by day of the week. .......................... 2-27 Figure 2.5-3. Ozone accumulation rate (ppb O 3 per hour) by day of the week. ..................... 2-28 Figure 2.5-4. Average duration between t NO=O3 and t maxO3 and average rates of accumulation of ozone on Sunday and Wednesday during 1981-84 and the differences. ...... 2-29 Figure 2.5-5. Average duration between t NO=O3 and t maxO3 and average rates of accumulation of ozone on Sunday and Wednesday during 1985-89 and the differences. ...... 2-30 Figure 2.5-6. Average duration between t NO=O3 and t maxO3 and average rates of accumulation of ozone on Sunday and Wednesday during 1990-94 and the differences. ...... 2-31 Figure 2.5-7. Average duration between t NO=O3 and t maxO3 and average rates of accumulation of ozone on Sunday and Wednesday during 1995-98 and the differences. ...... 2-32 Figure 2.5-8. Trends in ozone accumulation rate by site for Sunday, Wednesday, and the difference between Sunday and Wednesday. .................................................... 2-33 Figure 2.5-9. Trends in ozone accumulation rate for western, central, and eastern SoCAB for Sunday, Wednesday, and the difference between Sunday and Wednesday. 2-34 Figure 2.6-1. Average daily 6-9 a.m. (PDT) NMHC/NOx in the SoCAB by day of the week. ..................................................................................................... 2-35 Figure 2.6-2. Average daily NMHC/NOx at maximum ozone in the SoCAB by day of the week. ........................................................................................................... 2-36 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 Figure 3.1-1b Mean diurnal variations in ozone mixing ratios on Saturdays, Sundays, and Weekdays at Azusa in 1999-2000 and 1980-1998. .......................................... 3-22 Figure 3.1-1c Mean diurnal variations in ozone mixing ratios on Saturdays, Sundays, and Weekdays at Upland in 1999-2000 and 1980-1998. ......................................... 3-23 Figure 3.1-1d Mean diurnal variations in ozone mixing ratios on Saturdays, Sundays, and Weekdays at Rubidoux in 1980-1998. .............................................................. 3-24 xii
Figure 3.1-2 Mean day-of-the-week variations in daily maximum ozone mixing ratios at Los Angeles North Main, Azusa, Pico Rivera, and Upland during the summers (July-September) of 1999 and 2000. .................................................. 3-25 Figure 3.2-1a Day-of-the-week variations in NO and NO 2 mixing ratios during carryover (0000-0300, PDT), ozone inhibition (0600-0900), ozone accumulation ((0900- 1200), and ozone peak (1200-1500). Mean and standard deviations of the mean mixing ratios at Los Angeles North Main, Azusa, Pico Rivera, and Upland during the summers (July-September) of 1999 and 2000. .................... 3-26 Figure 3.2-1b Day-of-the-week variations in NMHC/NOx ratio and total NMHC mixing ratios during carryover (0000-0300, PDT), ozone inhibition (0600-0900), ozone accumulation ((0900-1200), and ozone peak (1200-1500). Mean and standard deviations of the mean mixing ratios at Los Angeles North Main, Azusa, Pico Rivera, and Upland during the summers (July-September) of 1999 and 2000.................................................................................................... 3-27 Figure 3.4-1 Mean diurnal variations in ozone and nitric oxide mixing ratios on Sunday and Midweek at Los Angeles North Main, Azusa, Pico Rivera, and Upland during the summers (July-September) of 1999 and 2000.................................. 3-28 Figure 3.4-2a Correlation plots of mean hourly ozone and NO mixing ratios during midweek (Tues-Thur) versus Friday. Separate linear regressions are shown for nighttime (9:00 p.m. – 5:00 a.m.) and daytime (6:00 a.m. – 9:00 p.m.) hours.. 3-29 Figure 3.4-2b Correlation plots of mean hourly ozone and NO mixing ratios during midweek (Tues-Thur) versus Saturday. Separate linear regressions are shown for nighttime (9:00 p.m. – 5:00 a.m.) and daytime (6:00 a.m. – 9:00 p.m.) hours.. 3-30 Figure 3.4-2c Correlation plots of mean hourly ozone and NO mixing ratios during midweek (Tues-Thur) versus Sunday. Separate linear regressions are shown for nighttime (9:00 p.m. – 5:00 a.m.) and daytime (6:00 a.m. – 9:00 p.m.) hours.. 3-31 Figure 3.5-1 Plots of ozone, VOC/NOx ratio, ozone production efficiency (∆[O 3 ]/(∆[HNO 3 ] + ∆[Organic Nitrates]) and hydroxyl radical superimposed on a color O 3 EKMA plot. ................................................................................. 3-32 Figure 3.5-2 Plots of PAN, HCHO, aldehyde and nitric acid superimposed on a color O 3 EKMA plot......................................................................................................... 3-33 Figure 3.5-3 Plots of organic nitrates, H 2 O 2 , HNO 3 /H 2 O 2 ratio and H 2 O 2 /HCHO ratio superimposed on a color O 3 EKMA plot. .......................................................... 3-34 Figure 3.6-1. Estimated mean photolysis rate parameter for NO 2 (J NO2 ) at Azusa on Sunday, and midweek (Tuesday to Thursday) for the periods 1980-85, 1986-90, 1991-94, 1995-98, and 1999-2000. J NO2 was calculated from an extended version of the O 3 -NO-NO 2 photostationary state expression. ........................... 3-35 Figure 3.6-2. Diurnal variations in the ratios of ozone to potential ozone (O 3 + NOx) on Sundays, Saturdays, and weekdays at Azusa for the years 1980-85, 1986-1990, 1991-1994, 1995-1998, and 1999-2000. ........................................ 3-36 xiii
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: Figure 1.4-13. Hourly average nitro
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
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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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Page 113 and 114:
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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
Page 127 and 128:
Los Angeles - N. Main Azusa 140 140
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2.8 2.6 PAN (ppb) 2.8 2.6 HCHO (ppb
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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
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Table 4.4-1c Number of observations
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Table 4.4-2a Number of observations
Page 159 and 160:
Table 4.4-2c Number of observations
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Table 4.4-3a CMB Performance Parame
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Table 4.4-3c Source Contribution Es
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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
Page 175 and 176:
Nitrogen Oxides at Pico Rivera 180
Page 177 and 178:
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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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
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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
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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