| Parameter | Threshold | |
|---|---|---|
(1) For the purposes of regulation 11 (action plans), exceedance of the 1-hour average in respect of the alert threshold is to be measured or predicted for three consecutive hours. | ||
| Alert threshold | 1-hour average(1) | 240 μg/m3 |
| Information threshold | 1-hour average | 180 μg/m3 |