Hazel

Corylus

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Hazel (Corylus)

Wikimedia Commons / Rosser1954

Botanical nameCorylus
SeasonJan – Mar
Peak levelFeb – Feb

Together with alder, hazel is the earliest pollen source of the year. The first hazel pollen can appear as early as January during mild weather. Cross-reactions with birch pollen and hazelnuts are common.

Pollen Season

Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Season (Jan – Mar) Peak level (Feb – Feb)

Typical Symptoms

  • Sneezing
  • Itchy eyes
  • Runny nose
  • Fatigue

Threshold Levels

  • Level 0 of 5: None< 10 grains/m³
  • Level 1 of 5: Low≥ 10 grains/m³
  • Level 2 of 5: Moderate≥ 50 grains/m³
  • Level 3 of 5: High≥ 80 grains/m³
  • Level 4 of 5: Very High≥ 150 grains/m³
  • Level 5 of 5: Extreme≥ 300 grains/m³

Thresholds based on European Aeroallergen Network (EAN) guidelines

Cross-Reactions

Hazelnut(Oral Allergy Syndrome)
Common
Apple(Oral Allergy Syndrome)
Occasional
Cherry(Oral Allergy Syndrome)
Occasional

Tips for Allergy Sufferers

1Watch for pollen levels as early as winter
2Cross-reaction with hazelnuts is possible — get it checked medically
3Fit pollen screens on bedroom windows

Hazel Pollen Forecast by City

Other Pollen Types