| Objective | Averaging period | Longterm objective | Date by which the longterm objective should be met |
|---|---|---|---|
| Protection of human health | Maximum daily eight-hour mean within a calendar year | 120 µg/m3 | not defined |
| Protection of vegetation | May to July | AOT40 (calculated from 1 h values) 6 000 µg/m3 · h | not defined |