Of these sites, at least one should be an urban background site, where NO2, NO and
O3 concentrations are measured as one hour averages. It should be selected in the
centre of the traffic zone. The monitors could be chemiluminescence or DOAS.
DOAS is a good choice , if a long measurement path can be established, because it
gives more representative data of the urban background. In larger urban areas more
urban background sites of the above type should be selected, e.g. one site for every 50
km2 of the urban "core". Outside the urban "core" at urban background sites and in
suburban areas with lower source density the sampling can be carried out with much
less time resolution, e.g. by diffusive samplers.
Between 3 and 10 street sites should be selected depending on the size of the urban
area and the diversity of the street types, and generally close to the urban background
stations. The busy streets (canyons) with the highest expected pollution with NO2
pollution and where many people are exposed (living, working or transported) should
be selected. At street sites the chemiluminescence method should be used for
measurements of NO and NO2. The measured data should be used for generalisations
and NO2 concentrations in other streets estimated by street pollution models.
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