ZDF.de Wetter - Gesundheit has Pollen, UZ index, Ozone levels and Biowetter (which gives advice about how to deal with the weather -
Kreislaufprobleme possible for people in Southern Germany today, oh what a shocker). Scroll to bottom of page for links.
BTW at first, I wasn't sure which allergies were meant here, I thought pollen but then considered "Warning! Nuts available in Tenglemann all over Germany!" but that's just me being me.