Open Allergy Map & Forum combines a global allergy map, official pollen data, user reports, and city forums. Unlike most allergy maps that only show official feeds, anyone can share the latest conditions in their city—or any place they know—so the picture stays closer to real time. Where the map can’t cover everything, the forums let people discuss country-specific meds and local conditions. The site also includes a built-in guide to the world’s major allergens.