For selecting the detailed location of sampling sites, at the micro scale, a large number

of additional factors also need to be considered:

· height of the inlet: at street sites not lower than 2-3 metres above ground; in urban

background: inlet can be higher, if the site is representative for a larger area

· sheltering from trees, buildings etc.: well away from obstacles such as trees,

buildings etc.; street sites near to the building line and no more than 5 metres from

the carriageway

· distance from crossing, traffic lights etc.: more than 25 metres

· manifold design

In addition, the following should be considered:

· interfering sources

· security

· access

· electrical power and telephone

· "visibility" of the site (aesthetic)

· safety of public and operators

· planning requirements

 

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