Regulation 22
SCHEDULE 5Information and alert thresholds
This schedule has no associated Explanatory Memorandum
Alert thresholds for Sulphur dioxide and Nitrogen dioxide
| Pollutant | Alert threshold(1) |
|---|---|
(1) To be measured over three consecutive hours at locations representative of air quality over the least 100 km2 or an entire zone, whichever is smaller. | |
| Sulphur dioxide | 500 µg/m3 |
| Nitrogen dioxide | 400 µg/m3 |
Information and alert thresholds for Ozone
| Purpose | Averaging period | Threshold |
|---|---|---|
| Information | 1 hour | 180 µg/m3 |
| Alert | 1 hour | 240 µg/m3 |