http://www.comune.milano.it/
http://www.provincia.milano.it/
http://www.regione.lombardia.it/
http://www.minambiente.it/ www.infrastrutturetrasporti.it
(Agenzia Regionale per la Protezione dell’Ambiente)
www.arpalombardia.it http://www.sinanet.anpa.it/
http://www.eea.eu.int/
http://www.atm-mi.it/
http://www.emt-amb.com/ http://www.ataf.net/
http://www.ulb.ac.be/ceese/ http://www.certu.fr/
http://www.clickmobility.it/ http://www.detr.gov.uk/
http://www.enea.it/ http://www.enea.it/
http://www.epa.gov/ http://www.europa.eu.int/eur-lex/ 
http://www.iclei.org/
http://www.meglio.milano.it/
http://www.who.ch/ Organization for Economic Co-operation and Development http://www.oecd.org/
http://www.polis-online.org/ http://www.sta.roma.it/
http://www.europa.eu.int/ http://www.unep.org/