SCHEDULE 3Alert and information thresholds
PART 1Alert thresholds for nitrogen dioxide and sulphur dioxide
Nitrogen dioxide | 400 μg/m3 measured over three consecutive hours at locations representative of air quality over at least 100 km2 or an entire zone or agglomeration, whichever is the smaller |
Sulphur dioxide | 500 μg/m3 measured over three consecutive hours at locations representative of air quality over at least 100 km2 or an entire zone or agglomeration, whichever is the smaller |
PART 2Alert and information thresholds for ozone
Parameter | Threshold | |
|---|---|---|
Alert threshold | 1 hour average(1) | 240 μg/m3 |
Information threshold | 1 hour average | 180 μg/m3 |
(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. | ||