# The Air Quality Standards (Wales) Regulations 2007, Part 2: Alert and information thresholds for ozone


Parameter
Threshold
(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.
Alert threshold
1-hour average
240 μg/m3
Information threshold
1-hour average
180 μg/m3

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Source: https://www.legislation.gov.uk/wsi/2007/717/schedule/3/part/2 (the official version)
Page: https://openlegislation.uk/air-quality-standards-wales-regulations-2007/schedule-3/part-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.