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The Air Quality Standards (Wales) Regulations 2007

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PART 1Limit values for Group A pollutants

Benzene

Averaging periodLimit valueAttainment date
Limit value for the protection of human healthCalendar year5 μg/m31 January 2010

Carbon monoxide

For the purposes of this table, the maximum daily 8-hour mean concentration will be selected by examining 8-hour running averages, calculated from hourly data and updated each hour. Each 8-hour average so calculated will be assigned to the day on which it ends, i.e. the first calculation period for any one day will be the period from 17:00 on the previous day to 01:00 on that day; the last calculation period for any one day will be the period from 16:00 to 24:00 on that day.

Averaging periodLimit value
Limit value for the protection of human healthMaximum daily 8-hour mean10 mg/m3

Lead

Averaging periodLimit value
Annual limit value for the protection of human healthCalendar year0.5 μg/m3

Nitrogen dioxide (NO2) and oxides of nitrogen (NOx)

Averaging periodLimit valueAttainment date
Hourly limit value for the protection of human health1 hour200 μg/m3 NO2, not to be exceeded more than 18 times a calendar year1 January 2010
Annual limit value for the protection of human healthCalendar year40 μg/m3 NO21 January 2010
Annual limit value for the protection of vegetationCalendar year30 μg/m3 NOx

PM10

Averaging periodLimit value
24-hour limit value for the protection of human health24 hours50 μg/m3 PM10, not to be exceeded more than 35 times a calendar year
Annual limit value for the protection of human healthCalendar year40 μg/m3 PM10

Sulphur dioxide

Averaging periodLimit value
Hourly limit value for the protection of human health1 hour350 μg/m3, not to be exceeded more than 24 times a calendar year
Daily limit value for the protection of human health24 hours125 μg/m3, not to be exceeded more than 3 times a calendar year
Limit value for the protection of ecosystemsCalendar year and winter (1 October to 31 March)20 μg/m3

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