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Functional urban areas – FUA (previously larger urban areas - LUZ)
At the time of joining Urban Audit project Polish public statistics did not have data on commuting. Thus in 2003, 2006, 2009 and 2011 editions of the project LUZ was defined as a one or more rings of LAU1 and LAU 2 units surrounding the city. For the 2012 edition of the project broader spatial coverage of Functional urban areas for Polish cities participating in the project has been verified (and the newly proposed by Eurostat cities was defined) on the basis of the results of "survey of employment-related population movements in 2006" The Functional urban area is an area in which 15% or more of the population commutes to work to the city center.