Weekend/Weekday Ozone Observations in the South Coast Air Basin

250
200
NO (ppb)
150
100
50
0
Sun Mon Tue Wed Thu Fri Sat
NO2 (ppb)
70
60
50
40
30
20
10
0
Sun Mon Tue Wed Thu Fri Sat
Carryover Ozone inhibition Ozone accumulation Peak Ozone
Figure 3.2-1a. Day-of-the-week variations in NO and NO2 mixing ratios during carryover
(0000-0300, PDT), ozone inhibition (0600-0900), ozone accumulation ((0900-1200), and ozone
peak (1200-1500) periods. 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