The WHO database contains results of urban outdoor air pollution monitoring from almost 1100 cities in 91 countries. Air quality is represented by annual mean concentration of fine particulate matter (PM10 and PM2.5, i.e. particles smaller than 10 or 2.5 microns). That database is very useful to understand differences and similarities in air pollution trends in Europe and in the other continents. Socio-economic implications of air pollution are more evident where health impact are more relevant. The knowledge about air quality policies outside Europe is crucial for a wider understanding of ecological implications of environmental governance in EU +28. A reportage from the magazine Newsweek on air pollution in Iran produced an intresting comparative infographic based on WHO Database.