Rare type of pollen observed at record levels in air for first time in forty years in U.K.

26 septiembre 2014

Ragweed, which grows in late-summer and early autumn, is one of the most notorious hayfever-causing plants in North America, but is rarely found in the United Kingdom as it requires long-lasting autumns before the first winter frost to grow and survive. Now, record levels have been recorded for the first time in four decades, say researchers, who warn that mild autumn could mean more misery for hayfever sufferers.