Hayfever sufferers' tough season
15 August 2012 Last updated at 07:16 BST
This year has been tough for hayfever sufferers, with the summer's changeable weather allowing weeds and grasses to flourish making the pollen season last several weeks longer than usual.
Scientists at Leicester University have been analysing grass pollen and found that this year's hayfever season has been the most prolonged for two decades.
The BBC's Jenny Hill reports.