- Y Diweddaraf sydd Ar Gael (Diwygiedig)
- Gwreiddiol (a wnaed Fel)
Dyma’r fersiwn wreiddiol (fel y’i gwnaed yn wreiddiol). This item of legislation is currently only available in its original format.
Averaging period | Limit value | Attainment date | |
---|---|---|---|
Limit value for the protection of human health | Calendar year | 5 μg/m³ | 1st January 2010 |
For the purposes of this table, the maximum daily 8-hour mean concentration shall be selected by examining 8-hour running averages, calculated from hourly data and updated each hour. Each 8-hour average so calculated shall be assigned to the day on which it ends, i.e. the first calculation period for any one day shall be the period from 17:00 on the previous day to 01:00 on that day; the last calculation period for any one day shall be the period from 16:00 to 24:00 on that day.
Averaging period | Limit value | |
---|---|---|
Limit value for the protection of human health | Maximum daily 8-hour mean | 10 mg/m³ |
Averaging period | Limit value | |
---|---|---|
Annual limit value for the protection of human health | Calendar year | 0.5 μg/m³ |
Averaging period | Limit value | Attainment date | |
---|---|---|---|
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 | 1st January 2010 |
Annual limit value for the protection of human health | Calendar year | 40 μg/m³ NO2 | 1st January 2010 |
Annual limit value for the protection of vegetation | Calendar year | 30 μg/m³ NOx |
Averaging period | Limit value | |
---|---|---|
24-hour limit value for the protection of human health | 24 hours | 50 μg/m³ PM10, not to be exceeded more than 35 times a calendar year |
Annual limit value for the protection of human health | Calendar year | 40 μg/m³ PM10 |
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 (1st October to 31st March) | 20 μg/m³ |
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