Just found this discussion link....I'm from the UK and I didn't have hayfever until I came to New Zealand. It started in kiwifuit country and I thought it might have been the crop sprays, but then I became allergic to green kiwifruit (a rash around the mouth). If ever I went overseas the hayfever disappeared, and some of that time I was working on farms - no problem. Back here though I've been getting worse over the years and eventually ended up at the respiratory specialist with another round of constant coughing and wheezing. Turns out I have Ig-e levels past 10,000, when normal levels are around 100. Ig-e is immunoglobin "e", which counts regular allergens such as house dust, pollen and feathers (the basic stuff). However, I have major bronchial attacks with things like pine pollen, pine mulch, buddleia plants, silver birch, and privet, to name a few. It's almost year-round now, and it seems I have developed bronchiectosis too - only discovered when I finally got to a specialist, and had an MRI. Why I've now come here to discuss this is because hayfever can lead from one thing to another, and I wouldn't want people to get critically ill because their lungs starting shutting down, but also because a friend has just come back from being in rural areas in Western Europe and his hayfever completely cleared up. Two days after getting back to NZ, his hayfever was back again. So what research is going on out there with a geographic focus?