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Mean pollen counts in Madrid over the past 21 years (1979-99)

1 division = 25 grains
The pollen count calendar showing the 18 most frequent types of pollen found in the Madrid atmosphere during 18 years of research. Only those pollens which are present at levels of > 0.4% of the total pollen count have been selected. Each type of pollen is expressed as a mean over 10 day periods (grains of pollen/m3 of air). Of the 18 types, just 4 are responsible for the majority of cases of hay fever (pollen allergy).

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