Table 2.
Air pollution data for the three study sites.
| Wake County, NC, 25 April 2002 to 16 January 2003 (267 days) |
Shelby County, TN, 9 January 2003 to 5 May 2004 (483 days) |
Galveston County, TX, 9 January 2003 to 5 May 2004 (483 days) |
||||
|---|---|---|---|---|---|---|
| Pollutant | Mean ± SD | Range | Mean ± SD | Range | Mean ± SD | Range |
| PM2.5 (μg/m3) | ||||||
| Site 1 | 14.1 ± 7.7 | 2.3–62.7 | 13.2 ± 5.1a | 2.7–35.2 | 10.9 ± 4.0a | 3.4–25.7 |
| Site 2 | 14.2 ± 6.7a | 3.5–46.1 | 12.0 ± 5.9 | 2.1–35.8 | ||
| Site 3 | 13.2 ± 6.2 | 3.1–38.0 | ||||
| Site 4 | 11.3 ± 5.5a | 2.6–34.1 | ||||
| Average | 14.2 ± 6.9 | 2.3–54.4 | 12.6 ± 5.1 | 3.5–35.2 | ||
| O3 (ppb) | ||||||
| Site 1 | 31.5 ± 16.1 | 5.7–71.0 | 28.0 ± 9.3 | 2.0–55.1 | 34.8 ± 14.2 | 9.0–83.2 |
| Site 2 | 35.5 ± 16.7 | 4.0–74.2 | 36.4 ± 10.3 | 2.0–70.6 | 25.1 ± 12.4 | 5.8–61.7 |
| Site 3 | 36.8 ± 15.3 | 4.5–69.9 | ||||
| Site 4 | 36.8 ± 16.3 | 3.9–75.1 | ||||
| Average | 30.8 ± 16.3 | 4.8–70.0 | 32.2 ± 9.5 | 2.0–57.7 | 30.5 ± 13.3 | 8.5–70.7 |
a
Recorded every 3 days (otherwise daily).