Air pollution statistics for Brazoria 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 | 89.26% | 9.37% | 1.38% | 0.00% |
| 1998 | 91.74% | 6.89% | 1.10% | 0.28% |
| 1999 | 90.22% | 7.26% | 1.40% | 1.12% |
| 2000 | 93.44% | 6.01% | 0.27% | 0.27% |
| 2001 | 88.22% | 9.59% | 2.19% | 0.00% |
| 2002 | 88.49% | 8.77% | 1.92% | 0.82% |
| 2003 | 85.16% | 10.99% | 3.30% | 0.55% |
| 2004 | 83.79% | 11.54% | 3.85% | 0.82% |
| 2005 | 83.66% | 12.47% | 3.88% | 0.00% |
| 2006 | 86.30% | 9.59% | 3.56% | 0.55% |
| 2007 | 93.87% | 5.19% | 0.94% | 0.00% |