Air pollution statistics for St. Charles Par, Louisiana
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 | 90.08% | 9.09% | 0.83% | 0.00% |
| 1998 | 92.01% | 6.89% | 1.10% | 0.00% |
| 1999 | 87.19% | 11.70% | 1.11% | 0.00% |
| 2000 | 86.63% | 11.14% | 1.67% | 0.56% |
| 2001 | 93.70% | 6.03% | 0.27% | 0.00% |
| 2002 | 94.49% | 5.51% | 0.00% | 0.00% |
| 2003 | 93.42% | 6.03% | 0.55% | 0.00% |
| 2004 | 94.23% | 5.22% | 0.55% | 0.00% |
| 2005 | 90.06% | 9.94% | 0.00% | 0.00% |
| 2006 | 91.14% | 8.29% | 0.57% | 0.00% |
| 2007 | 89.50% | 8.84% | 1.66% | 0.00% |