ANNEX IXU.K.Criteria for determining the minimum number of sampling points for fixed measurement of concentrations of ozone

[F1A. Minimum number of sampling points for fixed measurements of concentrations of ozone U.K.

Minimum number of sampling points for fixed continuous measurements to assess compliance with target values, long — term objectives and information and alert thresholds where such measurements are the sole source of information.

a

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

b

1 station per 25 000  km 2 for complex terrain is recommended.]

Population (× 1 000 ) Agglomeration a Other zones a Rural background
< 250 1 1 station/ 50 000  km 2 as an average density over all zones per country b
< 500 1 2
1 000 2 2
1 500 3 3
2 000 3 4
2 750 4 5
3 750 5 6
3 750 One additional station per 2 million inhabitants One additional station per 2 million inhabitants