Air pollution statistics for Stark 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 | 87.40% | 11.78% | 0.82% | 0.00% |
| 1998 | 80.82% | 14.79% | 4.11% | 0.27% |
| 1999 | 69.32% | 27.12% | 3.01% | 0.55% |
| 2000 | 73.22% | 25.14% | 1.64% | 0.00% |
| 2001 | 70.68% | 26.30% | 3.01% | 0.00% |
| 2002 | 68.22% | 25.75% | 6.03% | 0.00% |
| 2003 | 69.59% | 28.77% | 1.10% | 0.55% |
| 2004 | 71.86% | 27.32% | 0.82% | 0.00% |
| 2005 | 64.38% | 33.15% | 2.19% | 0.27% |
| 2006 | 76.61% | 22.81% | 0.29% | 0.29% |
| 2007 | 84.30% | 14.88% | 0.00% | 0.83% |