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PART IMacroscale siting
Type of station | Objective of measurement | Representativeness | Macroscale siting criteria |
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For rural and rural background stations, consideration should be given, where appropriate, to co-ordination with the monitoring requirements of Commission Regulation (EC) No. 1091/94 () concerning protection of the Community’s forests against atmospheric pollution. |
Urban | Protection of human health: to assess the exposure of the urban population to ozone, i.e. where the population density and ozone concentration are relatively high and representative of the exposure of the general population. | A few km2. | Away from the influence of local emission such as traffic, petrol stations etc.;
vented locations where well-mixed levels can be measured;
locations such as residential and commercial areas of cities, parks (away from the trees), big streets or squares with very little or no traffic, open areas characteristic of education, sports or recreation facilities.
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Suburban | Protection of human health and vegetation: To assess the exposure of the population and vegetation located in the outskirts of the agglomeration, where the highest ozone levels, to which the population and vegetation is likely to be directly or indirectly exposed, occur. | Some tens of km2 | At a certain distance from the area of maximum emissions downwind following the main wind directions during conditions favourable to ozone formation;
where population, sensitive crops or natural ecosystems located in the outer fringe of an agglomeration are exposed to high ozone levels;
where appropriate, some suburban stations also upwind of the area of maximum emissions, in order to determine the regional background levels of ozone.
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Rural | Protection of human health and vegetation: To assess the exposure of population, crops and natural ecosystems to sub-regional scale ozone concentrations. | Sub-regional levels (a few km2) | Stations can be located in small settlement and/or areas with natural ecosystems, forests or crops;
representative for ozone away from the influence of immediate local emissions such as industrial installations and roads;
at open area sites, but not on higher mountain-tops.
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Rural background | Protection of vegetation and human health: To assess the exposure of crops and natural ecosystems to regional-scale ozone concentrations as well as exposure of the populations. | Regional/national/ continental levels (1,000 to 10,000km2) | Station located in areas with lower population density, e.g. with natural ecosystems, forests, far removed from urban and industrial areas and away from local emissions;
avoid locations which are subject to locally enhanced formation of near-ground inversion conditions, also summits of higher mountains;
coastal sites with pronounced diurnal wind cycles of local character are not recommended.
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