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The Air Quality Standards (Wales) Regulations 2007

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Regulation 15(2)

SCHEDULE 6Minimum number of sampling points

PART 1Group A pollutants: human health-based limit values and alert thresholds

1.  This Part sets out the minimum number of sampling points for fixed measurement of Group A pollutants to assess compliance with limit values for the protection of human health and alert thresholds in zones where fixed measurement is the sole source of information.

Diffuse sources

Population of zone (thousands)If concentrations exceed the upper assessment threshold(1)If maximum concentrations are between the upper and lower assessment thresholdsFor nitrogen dioxide and sulphur dioxide in agglomerations where maximum concentrations are below the lower assessment thresholds
(1)

For NO2 and PM10 to include at least one urban-background station and one traffic-orientated station; this requirement also applies to benzene and carbon monoxide provided that it does not increase the number of sampling points.

0—24911not applicable
250—499211
500—749211
750—999311
1,000—1,499421
1,500—1,999521
2,000—2,749632
2,750—3,749732
3,750—4,749842
4,750—5,999942
6,000 or more1053

Point sources

2.  For the assessment of pollution in the vicinity of point sources, the number of sampling points for fixed measurement should be calculated taking into account emission densities, the likely distribution patterns of ambient-air pollution and the potential exposure of the population.

PART 2Group A pollutants: limit values for the protection of ecosystems or vegetation

3.  The Table below sets out the minimum number of sampling points for fixed measurements to assess compliance with limit values for the protection of ecosystems or vegetation in zones other than agglomerations.

If maximum concentrations exceed the upper assessment thresholdIf maximum concentrations are between the upper and lower assessment thresholds
1 station every 20,000 km21 station every 40,000 km2

4.  In island zones, the number of sampling points for fixed measurement should be calculated taking into account the likely distribution patterns of ambient-air pollution and the potential exposure of ecosystems or vegetation.

PART 3Group B pollutants

5.  This Part sets out the minimum number of sampling points for fixed measurement of Group B pollutants to assess compliance with target values for the protection of human health in zones where fixed measurement is the sole source of information.

Diffuse sources

Population of zone (thousands)If maximum concentrations exceed the upper assessment threshold(1)If maximum concentrations are between the upper and lower assessment thresholds
Arsenic, Cadmium, NickelBenzo(a) pyreneArsenic, Cadmium, NickelBenzo(a)pyrene
(1)

To include at least one urban-background station and for benzo(a)pyrene also one traffic-oriented station provided this does not increase the number of sampling points.

0—7491111
750—1,9992211
2,000—3,7492311
3,750—4,7493422
4,750—5,9994522
=<6,0005522

Point sources

6.  For the assessment of pollution in the vicinity of point sources, the number of sampling points for fixed measurement should be determined taking into account emission densities, the likely distribution patterns of ambient air pollution and potential exposure of the population. The sampling points should be sited such that the application of the measures referred to at regulation 7(2)(b) can be monitored.

PART 4Ozone

7.  Except insofar as otherwise provided by regulation 15(5) or (6), the minimum number of sampling points for fixed continuous measurement to assess air quality in view of compliance with the target values, long-term objectives and information and alert thresholds where continuous measurement is the sole source of information is set out in the table below.

Population of zone (thousands)Agglomerations (urban and suburban)(1)Other zones (suburban and rural)(1)Rural background
(1)

At least 1 station in suburban areas, where the highest exposure of the population is likely to occur. In agglomerations at least 50% of the stations should be located in suburban areas.

(2)

1 station per 25,000 km2 for complex terrain is recommended.

0—24911 station/50,000 km2 as an average density over all zones in Wales(2)
250—499121 station/50,000 km2 as an average density over all zones in Wales(2)
500—999221 station/50,000 km2 as an average density over all zones in Wales(2)
1,000—1,499331 station/50,000 km2 as an average density over all zones in Wales(2)
1,500—1,999341 station/50,000 km2 as an average density over all zones in Wales(2)
2,000—2,749451 station/50,000 km2 as an average density over all zones in Wales(2)
2,750—3,749561 station/50,000 km2 as an average density over all zones in Wales(2)
3,750 or more1 additional station per 2 million inhabitants1 additional station per 2 million inhabitants1 station/50,000 km2 as an average density over all zones in Wales(2)

PART 5Ozone: minimum number of sampling points for fixed measurements for zones attaining the long-term objectives

8.  In cases where zones attain the long-term objectives, the number of sampling points for ozone must, in combination with other means of supplementary assessment such as air quality modelling and co-located nitrogen dioxide measurements, be sufficient to examine the trend of ozone pollution and check compliance with the long-term objectives.

9.  The number of stations located in agglomerations and other zones may be reduced to one-third of the number specified in the Table in Part 4. Where information from fixed measurement stations is the sole source of information, at least one monitoring station should be kept. If, in zones where there is supplementary assessment, the result of this is that a zone has no remaining station, co-ordination with the number of stations in neighbouring zones must ensure adequate assessment of ozone concentrations against long-term objectives.

10.  The number of rural background stations should be 1 per 100,000 km2.

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