Table 1.
Number of daily hourly-maximum readings occurring in the three time periods for each of the four NO2 monitors, 2001–2003
| Pollution Monitor |
Time period | Count of daily hourly- maximums occurring in each time period |
Percent | Missing Maximums |
|---|---|---|---|---|
| Midnight - 7 am | 338 | 33.7 | ||
| Central Phoenix |
8 am - 3 pm | 92 | 9.2 | |
| 4 pm - 11 pm | 573 | 57.1 | ||
| 92 | ||||
| Midnight - 7 am | 392 | 39.9 | ||
| Green- wood |
8 am - 3 pm | 185 | 18.8 | |
| 4 pm - 11 pm | 405 | 41.2 | ||
| 113 | ||||
| Midnight - 7 am | 199 | 20.6 | ||
| South Scottsdale |
8 am - 3 pm | 61 | 6.3 | |
| 4 pm - 11 pm | 706 | 73.1 | ||
| 129 | ||||
| Midnight - 7 am | 306 | 30.7 | ||
| West Phoenix |
8 am - 3 pm | 96 | 9.6 | |
| 4 pm - 11 pm | 596 | 59.7 | ||
| 97 | ||||