As you know, spring is the worst pollen season and for allergy sufferers, pollen forecasts are just as important as keeping an eye on the weather.
The National Museum of Natural History has a comprehensive service called the Pollen Report. In addition to current forecasts and plenty of facts, you will find an interactive pollen diary that you can fill in to get to know your problems better.
The Pollen report is also available in the form of an app, called Pollen, which was developed at the University of Vienna.
You can also get current pollen forecasts via several weather services, for example Klart.se.