Weekend/Weekday Ozone Observations in the South Coast Air Basin

Los Angeles - N. Main
Azusa
140
140
Sunday
120
100
80
60
40
20
y = 1.49x
R 2 = 0.96
y = 1.14x
R 2 = 0.61
y = 0.87x
R 2 = 0.66
y = 0.43x
R 2 = 0.97
Sunday
120
100
80
60
40
20
y = 1.55x
R 2 = 0.99
y = 0.47x
R 2 = 0.83
y = 1.39x
R 2 = 0.91
y = 0.29x
R 2 = 0.98
0
0 20 40 60 80 100 120 140
Midweek
0
0 20 40 60 80 100 120 140
Midweek
Pico Rivera
Upland
Sunday
140
120
100
80
60
y = 1.50x
R 2 = 0.98
y = 1.35x
R 2 = 0.95
y = 0.69x
R 2 = 0.85
Sunday
140
120
100
80
60
y = 1.74x
R 2 = 0.97
y = 1.44x
R 2 = 0.97
y = 0.72x
R 2 = -0.10
40
20
y = 0.39x
R 2 = 0.99
40
20
y = 0.29x
R 2 = 0.91
0
0 20 40 60 80 100 120 140
Midweek
Nighttime mean Ozone (ppb)
Nighttime mean NO (ppb)
0
0 20 40 60 80 100 120 140
Midweek
Daytime mean Ozone (ppb)
Daytime mean NO (ppb)
Figure 1.4-17. 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.
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