# The Air Quality Standards (Wales) Regulations 2007, Paragraph 1


The following information on ozone concentrations must be obtained and collated—
Type of station
Level
Averaging /accumulation time
Provisional data for each month from April to September
Report for each year
(1) Maximum daily 8-hour mean.
(2) In this table, “AOT40” has the same meaning as in paragraph 3(d) of Part 4 of Schedule 1.
Information threshold
Any
180μg/m3
1 hour
For each day with any exceedance: date, total hours of, exceedance, maximum 1-hour ozone and related NO2 values when required
For each day with any exceedance: date, total hours of exceedance, maximum 1-hour ozone and related NO2 values, when required
Monthly 1-hour maximum ozone
Alert threshold
Any
240μg/m3
1 hour
For each day with any exceedance: date, total hours of exceedance, maximum 1-hour ozone and related NO2 values, when required
For each day with any exceedance: date, total hours of exceedance, maximum 1-hour ozone and related NO2 values, when required
Health protection
Any
120μg/m3
8 hours
For each day with any exceedance: date, 8 hours maximum
For each day with any exceedance: date, 8 hours maximum
Vegetation protection
Suburban, rural, rural background
AOT40 = 6,000 μg/m3.h
1 hour, accumulated from May to June
Value
Forest protection
Suburban, rural, rural background
AOT40 = 20,000 μg/m3.h
1 hour, accumulated from April to September
Value
Materials
Any
40 μg/m3
1 year
Value

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Source: https://www.legislation.gov.uk/wsi/2007/717/schedule/12/paragraph/1 (the official version)
Page: https://openlegislation.uk/air-quality-standards-wales-regulations-2007/schedule-12/paragraph-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.