Pollen Count

Pollen count in Leiden

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Trees start making pollen in Leiden in February. This is the start of pollen season. It begins with alder, hazel, and elm trees. They release tiny amounts of pollen into the air.

In March, more trees start making pollen. This includes oak, birch, and beech trees. They add to the amount of pollen in the air. The pollen count gets higher.

In April and May, grasses and weeds start making pollen. This is the peak of pollen season. The air is filled with pollen from trees, grasses, and weeds. It's a difficult time for people who react to pollen.

In June, pollen season starts to slow down. The amount of pollen in the air gets lower. By July, pollen season is almost over. The air is cleaner, and it's easier to be outside.

Chart

Recommendations

When pollen counts are high, we suggest doing these things to help with allergies, especially on windy days when pollen is flying around.

Annual Pollen Overview

Check out this month-by-month overview of the daily average pollen count in Leiden 🌾. 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 2.7 0 0 0 0 0
Feb 17.9 0 0 0 0 0
Mar 2.9 305.4 0.1 0 0 0
Apr 0.4 224.8 9.2 0 0.7 0
May 0 13.9 61.2 0 1.7 0
Jun 0 0.3 408.8 39.5 0 0
Jul 0 0 204.6 172.2 0 0
Aug 0 0 74.9 49.8 0 0.5
Sep 0 0 13 1.5 0 12.9
Oct 0 0 1.2 0 0 0
Nov 0 0 0 0 0 0
Dec 0 0 0 0 0 0

Disclaimer

* The pollen count information provided for Leiden 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.