If you are one of Britain's 16 million hay fever sufferers, then brace yourself - the highest pollen levels in half a century are predicted this year and the late spring is to blame.
Usually, different tree pollen is released in succession, starting with the alder in January. But the cool weather has meant a late start and the different pollen bursts are now expected to occur at the same time. Experts are also warning it will happen around the same time as grass pollen, from late May to July.
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