Survey of foreign websites with actual air quality information:
Real time ozone measurements in Europe
SMOGWARNER
The Netherlands
Germany (Schleswig-Holstein)
Germany (Baden-Wuerttemberg)
Germany (Niedersachsen)
Germany (Nordrhein-Westfalen)
Germany (prognosis)
France (Paris)
France (Nice)
France (Nord-Pas-De-Calais)
France
Ireland
United Kingdom (UK)
United Kingdom (London)
United Kingdom
Denmark
Sweden
Sweden (general info on ozone)
Norway
Austria
Slovakia
Greece (Athens)
Italie
(Lombardia)