The Air Quality Standards (Wales) Regulations 2007

PART 1Information to be submitted to the Commission

1.  The following information on ozone concentrations must be obtained and collated—

Type of stationLevelAveraging /accumulation timeProvisional data for each month from April to SeptemberReport 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 thresholdAny180μg/m31 hourFor each day with any exceedance: date, total hours of, exceedance, maximum 1-hour ozone and related NO2 values when requiredFor 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 thresholdAny240μg/m31 hourFor each day with any exceedance: date, total hours of exceedance, maximum 1-hour ozone and related NO2 values, when requiredFor each day with any exceedance: date, total hours of exceedance, maximum 1-hour ozone and related NO2 values, when required
Health protectionAny120μg/m38 hoursFor each day with any exceedance: date, 8 hours maximum(1)For each day with any exceedance: date, 8 hours maximum(1)
Vegetation protectionSuburban, rural, rural backgroundAOT40(2) = 6,000 μg/m3.h1 hour, accumulated from May to JuneValue
Forest protectionSuburban, rural, rural backgroundAOT40(2) = 20,000 μg/m3.h1 hour, accumulated from April to SeptemberValue
MaterialsAny40 μg/m31 yearValue

2.  The National Assembly must also ensure that the following information is collated—

(a)for ozone, nitrogen dioxide, oxides of nitrogen and the sums of ozone and nitrogen dioxide (added as parts per billion and expressed in μg/m3 ozone) the maximum, 99.9th, 98th and 50th percentiles and annual average and number of valid data from hourly series; and

(b)the maximum, 98th and 50th percentile and annual average from a series of daily 8-hour ozone maxima.

3.  Data compiled in monthly reports will be considered provisional and must be updated where necessary in subsequent submissions.