Table 3.
Average concentrations of PM2.5 and ozone in 2005–2007 and natural background levels used for comparison scenario
| Pollutant | Quarter | Averaging time | 2005–2007 NYC average concentration | Policy relevant background | |
|---|---|---|---|---|---|
| Area-wide monitor mean | UHF neighborhood range (N = 42) | ||||
| PM2.5 (μg/m3) | Jan–Mar | 24-h average | 14.1 | 11.6–17.1 | 0.85 |
| Apr–Jun | 12.6 | 10.2–14.0 | 0.78 | ||
| Jul–Sep | 16.4 | 13.8–17.0 | 0.67 | ||
| Oct–Dec | 12.7 | 10.7–13.9 | 0.68 | ||
| O3 (ppb) | Apr–Jun | 8-h Max | 43.8 | 36.3–45.0 | 21.20 |
| 24-h Mean | 30.3 | 23.8–31.5 | 14.70 | ||
| Jul–Sept | 8-h Max | 47.2 | 40.5–49.0 | 20.00 | |
| 24-h Mean | 30.2 | 24.6–32.0 | 13.00 | ||