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England and Wales
| Objective | Averaging period | Long-term objective | Date by which long-term 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 | AOT 40 (calculated from 1h values) 6000 μg/m3 · h | Not defined |