Pollen levels rising

People with asthma and allergies are being advised to be cautious this summer as La Nin˜a weather patterns prompt a surge in pollen levels. La Nin˜a brings hot and humid summers to New Zealand. It occurs every three to five years due to changes in ocean temperatures near the Equator. The combined effect of thewarmth, humidity, and wet weather creates optimal growing conditions for pollenproducing weeds, grasses, shrubs, and trees, Asthma and Respiratory Foundation NZ chief executive Letitia Harding said. Peoplewith asthma and allergies should ensure they have enough medication before medical practices close for Christmas, she said. NIWA meteorologist Ben Noll said La Nin˜a is expected to bring awarmer than average, but wetter summer for the North Island and upper South Island. Up to 80 per cent of asthma is related to an allergy.