Weekend/Weekday Ozone Observations in the South Coast Air Basin

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Nonmethane Hydrocarbons 100% 80% NMHC (ppbC) 60% 40% 4-54 20% 0% IH1 CV1 DS1 CO1 HF1 DS2 CO2 CV2 IH2 PO1 IH1 CV1 DS1 CO1 HF1 DS2 CO2 CV2 IH2 PO1 IH1 CV1 DS1 CO1 HF1 DS2 CO2 CV2 IH2 PO1 IH1 CV1 DS1 CO1 HF1 DS2 CO2 CV2 IH2 PO1 Mon, 10/2 Wed, 10/4 Sat, 10/7 Sun, 10/8 Gasoline Exhasut CNG Diesel Exhaust Gasoline Liquid Gasoline Vapor LPG Surface Coatings Consumer Products Figure 4.4-3. Source apportionment of non-methane hydrocarbons for mobile sampling loops and regional background sites – percent contributions.
5 Azusa, Weekdays 6-9 a.m (10/2/00-10/6/00) 5 Azusa, Weekdays 6-9 a.m. (10/2/00-10/6/00) black carbon (ug/m3) 4 3 2 1 y = 0.0341x + 1.3484 R 2 = 0.2146 0 0 10 20 30 40 NO (ppb) black carbon (ug/m3) 4 3 2 1 y = 0.0264x + 0.4372 R 2 = 0.6893 0 0 20 40 60 80 100 NOx (ppb) Azusa, Weekdays All Hours (10/2/00-10/6/00) Azusa, Weekdays All Hours (10/2/00-10/6/00) 5 5 4 4 black carbon (ug/m3) 3 2 1 y = 0.0386x + 1.7982 R 2 = 0.1615 black carbon (ug/m3) 3 2 1 y = 0.0377x + 0.3295 R 2 = 0.5023 0 0 10 20 30 40 NO (ppb) 0 0 20 40 60 80 100 NOx (ppb) Azusa, All Days & Hours (9/30/00-10/8/00) Azusa, All Days & Hours (9/30/00-10/8/00) 5 5 black carbon (ug/m3) 4 3 2 1 y = 0.043x + 1.5666 R 2 = 0.1926 black carbon (ug/m3) 4 3 2 1 y = 0.035x + 0.3861 R 2 = 0.4827 0 0 10 20 30 40 0 0 20 40 60 80 100 Figure 4.5-1a. Correlations of NO and NOx to black carbon at Azusa for different sets of weekdays and hours of the day. 4-55
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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
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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
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 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: 500 Nonmethane Hydrocarbons 400 NMH
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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