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The Air Quality Limit Values Regulations (Northern Ireland) 2002
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Limit values for sulphur dioxide
1.1
| Averaging Period | Limit Value | Margin of tolerance (1) | Date by which limit value is to be met | |
|---|---|---|---|---|
1. Hourly limit value for the protection of human health | 1 hour | 350 μg/m3, not to be exceeded more than 24 times a calendar year | 120 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 2005 | 1st January 2005 |
2. Daily limit value for the protection of human health | 24 hours | 125 μg/m3, not to be exceeded more than 3 times a calendar year | None | 1st January 2005 |
3. Limit value for the protection of ecosystems | Calendar year and winter (1st October to 31st March) | 20 μg/m3 | None | 1st May 2002 |
(1)
The figures for margins of tolerance for each of the relevant pollutants given in this Schedule are calculated from those given in Annexes I to IV to Directive 99/30/EC.
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