Hazel
Corylus
Live data not yet available
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
LowModerateHighVery High
Low ≥ 10 grains/m³
Moderate ≥ 50 grains/m³
High ≥ 80 grains/m³
Very High ≥ 150 grains/m³
Thresholds based on European Aeroallergen Network (EAN) guidelines
Cross-Reactions
Hazelnut(Oral Allergy Syndrome)
CommonApple(Oral Allergy Syndrome)
OccasionalCherry(Oral Allergy Syndrome)
OccasionalTips 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