Pollen count in Leiden

• Thursday 🙂
  Birch: 12.5 g/m³
  Grass: 2.7 g/m³
  
• Friday 😐
  Birch: 10.8 g/m³
  Grass: 14 g/m³
  
• Saturday 🤧
  Birch: 114.3 g/m³
  Grass: 43.1 g/m³
  
• See our chart for an hourly overview.

• 4-Day Chart
• Annual Overview

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.

• 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 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.

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