If you have hay fever, it helps if you do not spend too much time outside if the pollen count is high. Tips for when you're outside Do not cut grass or walk on grass. Wear wraparound sunglasses to stop pollen getting into your eyes. Put Vaseline around your nostrils to help trap pollen. Shower and change your clothes after you have been outside to wash off pollen. Tips for when you're inside Keep windows and doors shut as much as possible. Vacuum regularly and dust with a damp cloth. Do not keep fresh flowers in the house. Do not smoke or be around smoke as it makes hay fever symptoms worse. The best way to prevent any sort of allergic reaction is to avoid the substance that you're allergic to, if you can. There are some practical steps you can follow to help prevent allergies.