Overview
- DWD stations report very high concentrations in southeastern Brandenburg with marked increases in parts of southern, central and eastern Germany, and winds are carrying pollen into Berlin.
- Ambrosia pollen are about five times more allergenic than grass pollen, and even tiny amounts can trigger hay fever, conjunctivitis or asthma, with some people reacting on skin contact.
- People allergic to common mugwort face elevated risk due to frequent cross‑reactions noted by public‑health authorities.
- Helmholtz research finds nitrogen dioxide from traffic alters roadside ragweed pollen, increasing allergen proteins and intensifying local exposure.
- Authorities advise using DWD and Polleninformationsdienst forecasts, removing plants safely before flowering, wearing protection for flowering plants, and disposing of material in sealed bags in residual waste rather than compost.