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The Air Quality Standards (Wales) Regulations 2010
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Regulations 17, 21(1) and (3), 23(1) and 24(2)
SCHEDULE 4Information and alert thresholds
Alert thresholds for sulphur dioxide and nitrogen dioxide
| Pollutant | Alert threshold(1) |
|---|---|
| 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 |
(1)
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.
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