Weekend/Weekday Ozone Observations in the South Coast Air Basin

Table 3.2-3
Day-of-the-Week Variations in Mean Nitrogen Oxides (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 52 45 52 44 30 27 34 45
Monday 47 51 96 78 53 44 51 64
Tuesday 63 64 122 93 66 51 51 63
Wednesday 65 65 110 88 59 45 46 57
Thursday 60 57 105 88 62 50 48 60
Friday 60 61 103 84 60 45 46 60
Saturday 60 56 73 64 43 32 36 49
Los Angeles
Sunday 67 69 78 48 30 20 26 45
Monday 65 73 119 89 46 33 40 63
Tuesday 85 103 172 113 53 34 41 63
Wednesday 75 85 146 99 47 32 42 61
Thursday 69 76 144 102 46 32 40 60
Friday 63 74 132 94 45 30 37 54
Saturday 70 68 96 71 39 25 32 48
Pico Rivera
Sunday 63 63 62 38 30 29 35 53
Monday 67 77 110 82 52 42 46 60
Tuesday 91 115 147 96 63 45 54 61
Wednesday 84 107 139 91 52 38 48 66
Thursday 90 99 148 91 58 42 49 65
Friday 77 90 119 78 52 38 42 62
Saturday 80 79 99 61 41 30 35 53
Upland
Sunday 52 41 53 53 27 25 41 50
Monday 44 37 87 78 44 42 57 64
Tuesday 54 43 106 89 51 48 58 62
Wednesday 52 45 88 79 45 43 57 66
Thursday 50 44 109 88 50 48 58 68
Friday 60 54 107 95 48 42 53 65
Saturday 61 51 81 69 37 31 43 53
Mean
Sunday 59 55 61 46 29 25 34 48
Monday 56 60 103 82 49 40 49 63
Tuesday 73 81 137 98 58 45 51 62
Wednesday 69 76 121 89 51 40 48 63
Thursday 67 69 127 92 54 43 49 63
Friday 65 70 115 88 51 39 45 60
Saturday 68 64 87 66 40 30 37 51
3-15