Pollen Count in Herwijnen

4-Day Chart
Annual Overview

📱 Know your air. Daily Herwijnen pollen levels on your iPhone.

In late winter, some trees in Herwijnen start to release pollen. Hazel and alder are often first. Their pollen can begin in January or February. The air may still feel cold, but tiny yellow grains are already moving.

Updated: 7/10/2026

Spring is the main pollen season. Birch, willow, and poplar trees release much of their pollen from March to May. Grass plants begin later in spring. Their pollen can rise fast on warm, windy days. This is the busiest time for pollen.

Early summer brings more grass pollen. Many meadows and field edges around Herwijnen have grasses that flower in June and July. Ryegrass and other common grasses send out lots of pollen. The season often stays active into midsummer.

Late summer and early autumn bring weed pollen. Plants like mugwort and nettle release pollen from August to September. Their pollen usually is not as strong as spring tree pollen, but it can still be present on dry, breezy days.

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 Herwijnen 🌾. 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	23	0	0	0	0	0
Mar	327.6	78.6	0.1	0	0	0
Apr	4.9	2073.4	32	0	0	0
May	0.8	144.4	195.7	0	0.3	0
Jun	0	0.2	1157.6	10.5	0.4	0
Jul	0	0.4	459.8	74.5	0	0
Aug	0	0	163	24.7	0	0.3
Sep	0	0	23.7	0.9	0	2.6
Oct	0	0	2.9	0.1	0	0
Nov	0	0	0.2	0	0	0
Dec	0	0	0	0	0	0

Nearby Places

Disclaimer * The pollen count information provided for Herwijnen 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.