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Hay fever season has returned with the first pollen bomb of the year set to drop on the UK. The Met Office issued its first ‘high’ pollen alert on Tuesday, which covers most of England and Wales .
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A pollen count is a measurement of the number of pollen grains in a given volume of air. Pollen counts, and forecasts of pollen conditions, are routinely produced and reported to the public because high aerial pollen concentration is associated with increased rates of allergic reaction for those with conditions such as hay fever and asthma .
The allergic diseases—hay fever and asthma—have increased in the Western world over the past 2–3 decades. [141] Increases in allergic asthma and other atopic disorders in industrialized nations, it is estimated, began in the 1960s and 1970s, with further increases occurring during the 1980s and 1990s, [ 142 ] although some suggest that a ...
Allergic rhinitis, of which the seasonal type is called hay fever, is a type of inflammation in the nose that occurs when the immune system overreacts to allergens in the air. [6] It is classified as a type I hypersensitivity reaction . [ 8 ]
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