Hay fever is expected to rise dramatically in the next two weeks as levels of Birch pollen increase, according to pollen expert, Dr Jean Emberlin, Director of Allergy UK. A combination of warm, sunny days, light winds and air pollution are increasing the likelihood of sudden hay fever attacks this year. Dr Emberlin states the incidence of hay fever has doubled over the last 30 years and suggests that the reasons for this include more severe pollen seasons due to climate chang