Paragraph
England and Wales
| Averaging period | Limit value | Margin of tolerance | Date by which limit value is to be met | |
|---|---|---|---|---|
| Limit value for the protection of human health | Maximum daily 8-hour mean | 10mg/m3 | 4 mg/m3 on 1st January 2003, reducing every 12 months thereafter by 2 mg/m3 to reach 0 mg/m3 by 1 January 2005 | 1 January 2005 |