PART 1Limit values for Group A pollutants
Benzene
| Averaging period | Limit value | Attainment date |
|---|
| Limit value for the protection of human health | Calendar year | 5 μg/m3 | 1 January 2010 |
Carbon monoxide
For the purposes of this table, the maximum daily 8-hour mean concentration will be selected by examining 8-hour running averages, calculated from hourly data and updated each hour. Each 8-hour average so calculated will be assigned to the day on which it ends, i.e. the first calculation period for any one day will be the period from 17:00 on the previous day to 01:00 on that day; the last calculation period for any one day will 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 |
Lead
| Averaging period | Limit value |
|---|
| Annual limit value for the protection of human health | Calendar year | 0.5 μg/m3 |
Nitrogen dioxide (NO2) and oxides of nitrogen (NOx)
| 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 | 1 January 2010 |
| Annual limit value for the protection of human health | Calendar year | 40 μg/m3 NO2 | 1 January 2010 |
| Annual limit value for the protection of vegetation | Calendar year | 30 μg/m3 NOx | |
PM10
| 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 |
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 |
