Air pollution statistics for Washington Co, Ohio
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 | 88.50% | 10.45% | 1.05% | 0.00% |
| 1998 | 79.31% | 16.55% | 3.79% | 0.34% |
| 1999 | 76.24% | 19.86% | 3.55% | 0.35% |
| 2000 | 85.26% | 13.68% | 1.05% | 0.00% |
| 2001 | 80.90% | 17.71% | 1.39% | 0.00% |
| 2002 | 79.86% | 14.13% | 5.65% | 0.35% |
| 2003 | 87.10% | 11.69% | 0.40% | 0.81% |
| 2004 | 90.34% | 9.66% | 0.00% | 0.00% |
| 2005 | 80.00% | 17.45% | 2.55% | 0.00% |
| 2006 | 89.12% | 10.04% | 0.84% | 0.00% |
| 2007 | 80.00% | 19.09% | 0.91% | 0.00% |