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Climate change refers to a large-scale, long-term shift in the planet's weather patterns and average temperatures.
When does summer start and other summer facts you should know.
Tree pollen occurs first, typically from late March to mid-May. Grass (which actually has two peaks) lasts from mid-May until July, and weed pollen covers the end of June to September.
This page explores the links between nutrition and hay fever
Please note that when changing units, only forecasts and maps will be affected.