Air pollution statistics for Denton Co, Texas
3. Select a year
| Year | Percentage days with good air | Percentage days with moderate air | Percentage days with unhealthy air for sensitive groups | Percentage days with unhealthy air |
| 1997 | 78.02% | 15.93% | 4.67% | 1.37% |
| 1998 | 73.90% | 18.96% | 6.32% | 0.82% |
| 1999 | 77.53% | 15.34% | 5.48% | 1.64% |
| 2000 | 78.85% | 17.03% | 3.57% | 0.55% |
| 2001 | 79.34% | 16.25% | 4.13% | 0.28% |
| 2002 | 82.87% | 13.54% | 2.76% | 0.83% |
| 2003 | 76.99% | 19.18% | 3.84% | 0.00% |
| 2004 | 83.79% | 13.19% | 2.75% | 0.27% |
| 2005 | 72.60% | 22.74% | 4.38% | 0.27% |
| 2006 | 76.44% | 18.08% | 5.21% | 0.27% |
| 2007 | 87.74% | 12.26% | 0.00% | 0.00% |