Summary of 1 hour mean outdoor exposure variables preceding HRV measurements
| Variable (unit) | Min | 25% | 50% | 75% | 90% | Max |
|---|---|---|---|---|---|---|
| †Represents PM2.5 equivalent of actual nephelometric measure. | ||||||
| PM2.5 = (nephelometry measure*100 000 − 0.01)/0.28. | ||||||
| The median and mean values for the 4 and 24 hour exposures are similar to the 1 hour mean values. | ||||||
| PM2.5 (μg/m3)† | 3.3 | 8.0 | 10.7 | 15.6 | 20.9 | 40.3 |
| CO (ppm) | 0.63 | 0.99 | 1.22 | 1.51 | 1.81 | 2.50 |
| NO2 (ppm) | 0.006 | 0.017 | 0.021 | 0.026 | 0.029 | 0.046 |
| Temperature | 33.5 | 40.9 | 46.4 | 53.3 | 61.3 | 69.3 |
| Relative humidity | 45.1 | 73.5 | 80.2 | 84.7 | 89.1 | 97.9 |