Misery for hay fever sufferers as pollen levels to treble

Hay fever sufferers could reach new heights of misery over the next century as pollen levels soar, new research suggest.

Scientists predict that higher levels of carbon dioxide (CO2) in the atmosphere will lead to a significant boost in the amount of air-borne grass pollen.

Despite increases in ozone, which suppresses plant growth, pollen production is expected to more than treble in the next 100 years.