Weekend/Weekday Ozone Observations in the South Coast Air Basin

Table 3.2-2
Day-of-the-Week Variations in Mean Nitrogen Dioxide (ppb) by Time of Day for Azusa,
Los Angeles N. Main, Pico Rivera, and Upland for Summer 1999-2000
HOUR (PDT): 00-03 03-06 06-09 09-12 12-15 15-18 18-21 21-24
Azusa
Sunday 39 33 29 31 27 25 32 40
Monday 35 32 36 48 45 40 47 51
Tuesday 43 38 41 54 55 45 47 51
Wednesday 44 38 40 52 50 40 42 46
Thursday 39 35 39 52 51 44 43 48
Friday 40 35 37 50 50 39 42 47
Saturday 40 36 34 42 37 30 34 43
Los Angeles
Sunday 34 31 31 33 26 18 25 33
Monday 32 30 38 50 37 28 36 40
Tuesday 39 36 46 60 42 29 35 41
Wednesday 36 32 41 54 37 27 36 37
Thursday 34 31 42 53 36 26 33 38
Friday 33 31 39 51 36 24 32 37
Saturday 35 31 35 44 33 21 28 35
Pico Rivera
Sunday 32 28 25 25 25 23 29 34
Monday 28 28 30 45 41 34 40 41
Tuesday 37 33 38 53 49 37 42 42
Wednesday 36 33 36 50 41 31 37 40
Thursday 35 31 35 49 44 32 38 38
Friday 32 29 34 45 41 31 37 38
Saturday 33 29 31 38 34 25 31 36
Upland
Sunday 38 30 35 40 24 24 38 43
Monday 35 29 41 50 37 38 52 52
Tuesday 43 35 44 56 43 44 52 51
Wednesday 43 35 42 52 39 39 50 50
Thursday 39 34 46 57 42 43 51 51
Friday 41 35 45 60 41 38 48 50
Saturday 41 36 41 48 33 29 41 45
Mean
Sunday 36 31 30 32 26 23 31 38
Monday 33 30 36 48 40 35 44 46
Tuesday 41 36 42 56 47 39 44 46
Wednesday 40 35 40 52 42 34 41 43
Thursday 37 33 41 53 43 36 41 44
Friday 37 33 39 52 42 33 40 43
Saturday 37 33 35 43 34 26 34 40
3-14