Collected data for the City statistics project is also delivered to the European Statistical Agency Eurostat. Switzerland therefore participates in an attempt to provide a range of indicators covering most aspects relating to quality of life in cities in the EU, Norway, and Turkey (demography, housing, health, labour market, education, environment, etc.). Data availability differs from topic to topic, as the statistics are provided on a voluntary basis only (there is no EU legislation on the collection of these statistics). The data collection exercise (formerly known as Urban Audit) is undertaken by national statistical institutes, the Directorate-General for Regional and Urban Policy and Eurostat.
Data availability differs from country to country and from year to year. It's worth checking out the international data in Eurostats database.