Alder
Alnus
Wikimedia Commons / Willow
Botanical nameAlnus
SeasonJan – Apr
Peak levelFeb – Mar
Alder is one of the earliest flowering trees and affects allergy sufferers as early as January. Alders prefer damp areas along rivers and lakes. Their pollen can travel long distances on the wind.
Pollen Season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Season (Jan – Apr) Peak level (Feb – Mar)
Typical Symptoms
- Sneezing
- Itchy eyes
- Blocked 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
Tips for Allergy Sufferers
1Ventilate only briefly and in short bursts during the pollen season
2Wash your hair in the evening to remove pollen
3Do not dry laundry outdoors