# The Air Quality (Ozone) (Wales) Regulations 2003, Part I: Information on ozone levels


The following information on ozone concentrations must be obtained and collated:
Type of station
Level
Averaging /accumulation time
Provisional date for each month from April to September
Report for each year
(a)in this Schedule, “AOT40” has the same meaning as in paragraph (d) of Part I to Schedule 1.
(b)maximum daily 8-hour mean.
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.
— monthly 1 hour maximum ozone.
-for each day with any exceedance: date, total hours of exceedance, maximum 1 hour ozone and related NO2 values when required.
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 Materials
Suburban, rural, rural background Any
AOT40 =20,000 μg/m3·h 40μg/m3
1 hour, accumulated from April to September 1 year
Value Value

---
Source: https://www.legislation.gov.uk/wsi/2003/1848/schedule/8/part/I (the official version)
Page: https://openlegislation.uk/air-quality-ozone-wales-regulations-2003/schedule-8/part-I
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.