AQD - Local dispersion situation** Submitted None Data Dictionary Vocabularies Eionet Data Dictionary Street canyon Continuous/compact buildings along both sides of the street over more than 100 m. Average ratio of height of buildings to width of street > 0,5. (for this purpose "street" means the distance between the two facades of the buildings opposing each other, so including any pavements, gardens, etc.). Valid Data Dictionary Vocabularies Eionet Data Dictionary AQD - Local dispersion situation** Detached buildings or one-sided compact buildings Detached buildings on both sides of the street. Compact buildings on one side of the street, few buildings on the other side. Forest or groups or large trees in a surrounding of some 10 m Valid Data Dictionary Vocabularies Eionet Data Dictionary AQD - Local dispersion situation** Elevated terrain Summit, slope or saddle. Relative altitude of the station at least some 10 m related to surroundings of some 100 m. Monitoring stations located on towers or high buildings are not considered as “elevated”. Valid Data Dictionary Vocabularies Eionet Data Dictionary AQD - Local dispersion situation** Open terrain Flat area without large buildings or large trees in a surrounding of several 10 m Valid Data Dictionary Vocabularies Eionet Data Dictionary AQD - Local dispersion situation**