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- Original (As made) - Welsh
The Air Quality Standards (Wales) Regulations 2007
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Sulphur dioxide
| Averaging period | Limit value | |
|---|---|---|
| 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 |
| 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 |
| Limit value for the protection of ecosystems | Calendar year and winter (1 October to 31 March) | 20 μg/m3 |
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