Table 4.
Outdoor PM2.5 and ozone levels in McAllena during the study period for each household.
| HH | PM2.5 (μg/m3) | Ozone (ppm) | ||||||
|---|---|---|---|---|---|---|---|---|
| Days 1–7 | Days 9–15 | Days 1–7 | Days 9–15 | |||||
| 1 | 10.3 | (3.6) | 11.1 | (3.4) | 0.028 | (0.009) | 0.029 | (0.011) |
| 2 | 10.4 | (3.5) | 10.5 | (3.9) | 0.034 | (0.012) | 0.025 | (0.005) |
| 3 | 13.6 | (2.2) | 12.8 | (4.5) | 0.020 | (0.003) | 0.026 | (0.003)b |
| 4 | 13.6 | (2.2) | 12.8 | (4.5) | 0.020 | (0.003) | 0.026 | (0.003)b |
| 5 | 11.8 | (4.4) | 13.9 | (3.1) | 0.020 | (0.003) | 0.025 | (0.004)b |
| 6 | 6.0 | (1.1) | 7.6 | (3.4) | 0.034 | (0.008) | 0.029 | (0.004) |
| 7 | 7.0 | (2.3) | 6.2 | (1.6) | 0.032 | (0.009) | 0.030 | (0.004) |
| 8 | 8.4 | (3.4) | 6.1 | (1.7) | 0.033 | (0.009) | 0.030 | (0.004) |
| 9 | 8.4 | (3.4) | 6.1 | (1.7) | 0.033 | (0.009) | 0.030 | (0.004) |
| 10 | 5.8 | (2.0) | 7.3 | (2.0) | 0.033 | (0.008) | 0.033 | (0.009) |
| 11 | 5.3 | (1.6) | 7.1 | (2.0) | 0.030 | (0.008) | 0.035 | (0.009) |
| 12 | 5.3 | (1.6) | 7.1 | (2.0) | 0.030 | (0.008) | 0.035 | (0.009) |
| 13 | 6.9 | (1.5) | 4.8 | (1.8) | 0.031 | (0.009) | 0.037 | (0.005) |
Source: Outdoor Air Quality Data, US Environmental Protection Agency (https://www.epa.gov/outdoor-air-quality-data/download-daily-data). Note. The two-sample t-test was used to test the difference of concentrations between Days 1–7 and Days 9–15 within each household. Expressed in mean of daily measurements (SD); a McAllen-Edinburg-Mission, TX. b Significant at p < 0.05.