European air quality index: sub-index O3 (based on pollutant concentrations in µg/m3)
 | good |
 | fair |
 | moderate |
 | poor |
 | very poor |
 | extremely poor |
 | no data |
European air quality index: sub-index O3 (based on pollutant concentrations in µg/m3)
| good |
| fair |
| moderate |
| poor |
| very poor |
| extremely poor |
| no data |