Regulations 18(1), 24(1) and (3),25(5), 28(2)
| Pollutant | Target value for the total content in the PM10 fraction averaged over a calendar year | Date by which target value should be met |
|---|---|---|
| Arsenic | 6 ng/m3 | 31st December 2012 |
| Cadmium | 5 ng/m3 | 31st December 2012 |
| Nickel | 20 ng/m3 | 31st December 2012 |
| Benzo(a)pyrene | 1 ng/m3 | 31st December 2012 |
| Objective | Averaging period | Target value | |
|---|---|---|---|
(a) The maximum daily eight hour mean concentration must be selected by examining eight hour running averages, calculated from hourly data and updated each hour. Each eight hour average so calculated must be assigned to the day on which it ends, that is, the first calculation period for any one day will be the period from 1700 hours on the previous day to 0100 hours on that day; the last calculation period for any one day will be the period from 1600 hours to 2400 hours on the day. (b) If the three or five year averages cannot be determined on the basis of a full and consecutive set of annual data, the minimum annual data required for checking compliance with target values will be as follows:— (i) for the target value for the protection of human health: valid data for one year; and (ii) for the target value for the protection of vegetation: valid data for three years. | |||
| Protection of human health | Maximum daily eight hour mean(a) | 120 µg/m3 not to be exceeded on more than 25 days per calendar year averaged over three years(b) | |
| Protection of vegetation | May to July | AOT 40 (calculated from 1h values) 18,000 µg/m3 .h averaged over five years(b) | |
| Averaging period | Target value | |
|---|---|---|
| Calendar year | 25 µg/m3 |