As the weather heats up this week, there's no surer sign that hay fever season is well and truly upon us.It is expected that around 10 million Britons will fall prey to pollen this summer, with sufferers forced to fend off taxing symptoms like sneezing, itchy eyes and a runny nose.However one expert has warned that the fight against hay fever is not only one waged outdoors - but you are also at risk inside the comfort of your car.
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