Aware of your constantly increasing need for information in the field of pollen and aerobiology, the UCB Institute of Allergy (IOA) has prepared a collection of interesting websites.
Please note: a listed link does not imply that it has IOA's "seal of approval" or any kind of official support but that it may be of use to the allergic individual or health professional.
Worldwide: http://www.hon.ch/Library/Theme/Allergy/Glossary/calendar.html
Europe: http://www.polleninfo.org
Belgium: http://www.airallergy.be
France: http://www.rnsa.asso.fr
Italy: http://www.isao.bo.cnr.it
The Netherlands: http://www.lumc.nl/patientenzorg.html
Spain: http://www.uco.es/investiga/grupos/rea/index.html
UK: http://www.bbc.co.uk/weather/pollen/index.shtml
USA: http://www.aaaai.org