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Seasonal Allergens

Region

Season

Plants

Severity

Pollen Diameter

Filter Efficiency

North America

July-Nov

Ragweed/plantain

Severe

20-37µm

99%

Apr-Aug

Timothy/Orchard/Bermuda/Blue

Moderate

22-45µm

99%

Feb-May

Oak/Elm/Cedar/Birch

Moderate

20-60µm

100%

Europe

Jan-Apr

Birch/Cypress

Severe

20-60µm

100%

Apr-Sep

Orchard/Timothy/Rye/Blue

Severe

22-122µm

99%

Apr-Aug

Sycamore/Olive

Moderate

18-25µm

97%

Australia

Oct-June

Rye/Bermuda/Blue

Severe

22-45µm

99%

Oct-Apr

Wattle/Ti-tree/Birch

Moderate

20-60µm

100%

Japan

Jan-May

Japanese-Cedar/Cypress

Severe

25-36µm

100%

China

July-Nov

Wormwood/Japan Hop/Ragweed

Severe

20-37µm

99%


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