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 Larger Urban Zones 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 Larger Urban Zone is an area in which 15% or more of the population commutes to work to the city center.
In some cities the broader boundaries of Larger Urban Zones have been defined based on commuting to work to group of administrative units and not to the single city:
- for the cities of Gdańsk and Gdynia - was defined one Larger Urban Zone based on the three cities area (Gdańsk, Sopot, Gdynia).
- for Katowice and 13 other cities that forme Upper Silesian Metropolitan Union, has been appointed one Larger Urban Zone.
More information in publication of Statistical Office in Poznań Basic urban statistics.