| Air Quality Index, Bexar Co. | |||
| Year | |||
| 2006 | 2007 | 2008 | |
| Total Days with Air Quality Index (AQI) | 365 | 365 | 306 |
| Number of Days with AQI Classified as Good | 253 | 283 | 218 |
| Percent of Days with AQI Classified as Good | 69.3 | 77.5 | 71.2 |
| Number of Days with AQI Classified as Moderate | 91 | 78 | 78 |
| Percent of Days with AQI Classified as Moderate | 24.9 | 21.4 | 25.5 |
| Number of Days with AQI Classified as Unhealthy for Sensitive Groups | 21 | 3 | 10 |
| Percent of Days with AQI Classified as Unhealthy for Sensitive Groups | 5.8 | 0.8 | 3.3 |
| Number of Days with AQI Classified as Unhealthy | 0 | 1 | 0 |
| Percent of Days with AQI Classified as Unhealthy | 0.0 | 0.3 | 0.0 |
| Number of Days with AQI Classified as Moderate/Unhealthy/Unhealthy for Sensitive Groups | 112 | 82 | 88 |
| Percent of Days with AQI Classified as Moderate/Unhealthy/Unhealthy for Sensitive Groups | 30.7 | 22.5 | 28.8 |
| Data Source: Environmental Protection Division | |||