Pollen Count in Aarau

4-Day Chart
Annual Overview

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Aarau, Switzerland has different pollen seasons. Tree pollen starts in March. It's a big problem for people. Trees like oak, beech, and birch make a lot of pollen.

Updated: 4/24/2026

Grass pollen season starts in May. It's usually the worst month. Grass pollen makes a lot of people feel sick. This season can last until July.

Weed pollen season starts in August. It's not as bad as tree or grass pollen. Weeds like ragweed and nettle make pollen. This season ends in October.

Winter months have little pollen. It's a good time for people who feel sick from pollen. Snow and cold weather help reduce pollen in the air.

Pollen Forecast Chart

Recommendations

When pollen concentrations reach a peak, we suggest these simple steps to help with hay fever. These tips are extra important on windy days when plants are in peak anthesis (the time when they release the most pollen).

Wear masks if necessary
Shower after going out
Wear sunglasses if windy
Close windows and doors
Use an indoor air purifier
Avoid wearing woolen clothes outside
Limit outdoor activities

Annual Pollen Overview

Check out this month-by-month overview of the daily average pollen count in Aarau 🌾. This data is based on previous years and serves as a guideline to help you understand when different pollen seasons typically occur in your city.

	Alder	Birch	Grass	Mugwort	Olive	Ragweed
Jan	0	0	0	0	0	0
Feb	7.2	0	0	0	0	0
Mar	38.1	52.2	0.1	0	0	0
Apr	4	1888.2	30.9	0	0.1	0
May	0.5	112.5	330.6	0	1.2	0
Jun	0	11.1	1189.8	0.1	2.6	0
Jul	0	0.1	377.8	14.1	0	0
Aug	0	0	91	32.8	0	8.2
Sep	0	0	8	16.4	0	7.5
Oct	0	0	0.9	2.1	0	0
Nov	0	0	0	0	0	0
Dec	0	0	0	0	0	0

Nearby Places

Disclaimer * The pollen count information provided for Aarau is for educational purposes only, sourced from the CAMS European air quality database. We cannot guarantee its accuracy or reliability. This information is not a substitute for professional medical advice. Consult a qualified healthcare provider for medical concerns. We are not medical professionals.