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The Air Quality Limit Values Regulations (Northern Ireland) 2002
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Limit values for nitrogen dioxide and oxides of nitrogen
2.1
| 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 | 200 μg/m3, NO2 not to be exceeded more than 18 times a calendar year | 90 μg/m3 on 19th July 2001, reducing on 1st January of each following year by equal annual amounts to reach 0 μg/m3 by 1st January 2010 | 1st January 2010 |
2. Annual limit value for the protection of human health | Calendar year | 40 μg/m3 NO2 | 18 μg/m3 on 19th July 2001, reducing on 1st January of each following year by equal annual amounts to reach 0 μg/m3 by 1st January 2010 | 1st January 2010 |
3. Annual limit value for the protection of vegetation | Calendar year | 30 μg/m3 NOx | None | 1st May 2002 |
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