Paragraph 2.1 Limit values for nitrogen dioxide and oxides of nitrogen
England and Wales
| Averaging period | Limit value | Margin of tolerance | Date by which limit value is to be met | |
|---|---|---|---|---|
1.Hourly limit value for the protection of human health | 1 hour | 200μg/m3 NO2, not to be exceeded more than 18 times a calendar year | 70μg/m3 on 1st January 2003, reducing on 1st January of each following year by equal annual amounts to reach 0μg/m3 by 1st January 2010 | 1st January 2010 |
2.Annual limit value for the protection of human health | Calendar year | 40μg/m3 NO2 | 14μg/m3 on 1st January 2003, reducing on 1st January of each following year by equal annual amounts to reach 0μg/m3 by 1st January 2010 | 1st January 2010 |
3.Annual limit value for the protection of vegetation | Calendar year | 30μg/m3 NOx | None |