The map shows most of Glasgow city centre is suffering high levels of pollution, the red and dark orange show the areas likely to be breaching air pollution safety limits.
The maps are is based on monitoring for nitrogen dioxide by local authorities, analysed by Friends of the Earth Scotland. The data in each case is the most recent available (2012 for Edinburgh, 2010 for Glasgow and 2010 for Perth). Contains Ordnance Survey data © Crown Copyright and database right 2013.
For more maps and information on other Scottish cities follow this link.