Paragraph
(a)
To be measured over three consecutive hours at locations representative of air quality over at least 100 km2 or an entire zone, whichever is smaller.
Information and alert thresholds for ozone
| Purpose | Averaging period | Threshold |
|---|---|---|
| Information | 1 hour | 180 µg/m3 |
| Alert | 1 hour | 240 µg/m3 |