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Directive 2008/50/EC of the European Parliament and of the CouncilShow full title
Directive 2008/50/EC of the European Parliament and of the Council of 21 May 2008 on ambient air quality and cleaner air for Europe
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ANNEX XIIINFORMATION AND ALERT THRESHOLDS
A.Alert thresholds for pollutants other than ozone
To be 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.
| Pollutant | Alert threshold |
|---|---|
| Sulphur dioxide | 500 µg/m3 |
| Nitrogen dioxide | 400 µg/m3 |
B.Information and alert thresholds for ozone
| a For the implementation of Article 24, the exceedance of the threshold is to be measured or predicted for three consecutive hours. | ||
| Purpose | Averaging period | Threshold |
|---|---|---|
| Information | 1 hour | 180 µg/m3 |
| Alert | 1 houra | 240 µg/m3 |
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