Pollen is released by different trees and plants throughout the year. In the Kanto region, for example, cedar trees are active from February through April, while Japanese cypress trees primarily release pollen in April and May. In June, pollen is released by orchardgrass, followed by mugwort and ragweed during autumn.
Scientists believe that high temperatures during summer cause more pollen to be released the following spring. Some experts say that global warming is behind the rising number of hay fever sufferers in recent years.
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