Air pollute stats for Koochiching Co in 1998
| County | Koochiching Co |
| State | Minnesota |
| Data from year | 1998 |
| Total number of days monitored | 306 |
| Good air | 304 (99.35%) |
| Moderate air | 2 (0.65%) |
| Unhealthy for sensitive groups | 0 (0.00%) |
| Unhealthy for all | 0 (0.00%) |
|
| Worst pollutants |
|
| Carbon monoxide | 0 (0.00%) |
| Nitrogen dioxide | 0 (0.00%) |
| Ozone | 306 (100.00%) |