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Scientists will combine data given to them by allergy sufferers with information on weather, pollen, and pollution to find out what is making Britain sneeze. But there's bad news for iPhone users – the app is currently only available on Android.
App users will also be able to see how their symptoms compare to others in the UK through real-time allergy maps on the #BritainBreathing website.
If you're outside of the UK you can still use the app to track your own symptoms, but your data won't be used by scientists to do research, and there won't be any maps for you to look at.
"We're seeing a real increase in allergies and we just don't know why," Dr Sheena Cruickshank of the University of Manchester said in a video about the project.
"In an allergy you're having an immune response to something that you should be ignoring," she said. "Some of the most common allergies, like hay fever and asthma, can also be caused by an allergic reaction to pollens or dust particles, and they can be exacerbated by things in the environment."
The rise in allergies could be down to different pollutants and pollens in the environment compared with the past, or it could be down to increased cleanliness and our immune system not being as well trained as it used to be.
The app will build a big picture of the pattern of allergies across the UK and the scientists hope it will help them figure out what is triggering people's allergies and why there's an increase.