Air pollute stats for Union Co in 1999
| County | Union Co |
| State | New Jersey |
| Data from year | 1999 |
| Total number of days monitored | 365 |
| Good air | 211 (57.81%) |
| Moderate air | 148 (40.55%) |
| Unhealthy for sensitive groups | 6 (1.64%) |
| Unhealthy for all | 0 (0.00%) |
|
| Worst pollutants |
|
| Carbon monoxide | 28 (7.67%) |
| Nitrogen dioxide | 0 (0.00%) |
| Ozone | 1 (0.27%) |