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Pollen map 2024: which departments are on red alert for the risk of allergies?

  • April 3, 2024
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Pollens did not wait for spring to begin to settle in France. Many departments have been affected by the allergic risk for several weeks. Which departments are affected at the start of April? The allergy-pollen bulletin from the National Aerobiological Surveillance Network (RNSA) of April 2 warns in particular of a risk of allergy to birch pollen, but not only.

RNSA pollen map: the departments currently on red alert this month of April

During this pollen season, only 3 French departments face a “low” risk of pollen allergy, while 25 French departments are affected by a “medium” risk. The red alert, in other words the “high” allergy risk, concerns the majority of departments, 67 in total.

Here is the forecast map updated on April 2, 2024 by the National Aerobiological Surveillance Network (RNSA):

© National Aerobiological Surveillance Network (RNSA)

Pollen alert: birch, cypress, plane tree… What are the allergic risks at the moment in France?

What pollens are currently involved in the allergic risk highlighted by the National Aerobiological Surveillance Network? Birch pollens are particularly involved, and “will be responsible for a high risk of allergies in many departments north of a Bordeaux-Grenoble line”, writes the RNSA. Ash and plane tree pollens are also present throughout the territory.

Each region then has its specificities in terms of pollen: in the South-East, we find pollens of Cupressaceae (cypress, etc.), oak, plane tree and parietaceae (urticaceae), while on the West facade, we finds grass pollens.

Allergy sufferers should remain vigilant against the pollen present in the air at the beginning of April. The spring weather of the coming days will favor the emission and dispersion of #pollens birch, grasses, plane tree, oak, ash, willow, poplar… https://t.co/VfgV86gf94 pic.twitter.com/wXUllTxBBT

— National Aerobiological Surveillance Network (@rnsa_pollen) April 2, 2024

Pollens: what is an allergy?

An allergy “is a hypersensitivity of the body to substances, generally harmless and present in the environment” as explained by Health Insurance. In the case of pollen allergy, symptoms following an allergic reaction occur “generally” in spring, during the period of plant pollination, according to the Institut Pasteur de Lille. But it can last until the fall. Pollen in the air “penetrates the respiratory tract and comes into contact with the eyes, causing more or less serious inflammation in allergic people” is it detailed.

What are the symptoms of pollen allergy?

Exposure to pollen can cause certain symptoms in an allergic person:

Pollen allergy: how to react?

However, there are some good actions to take in order to reduce the symptoms, which can sometimes be disturbing. The Ministry of Health reminds us of the good reflexes to have at home:

  • ventilate for at least ten minutes a day,
  • wash your hair in the evening,
  • avoid allergenic factors (tobacco, indoor perfumes, incense, etc.).

When you are outdoors, you should:

  • Avoid drying laundry outside,
  • Do not do outdoor sports (such as running for example) which leads to overexposure to pollen,
  • Keep windows closed when traveling by car.

Pollen allergies can be debilitating, but are generally benign. If symptoms worsen, do not hesitate to consult a doctor.

Here are the right actions to follow to protect yourself from pollen and limit your exposure: regularly consult the pollen vigilance map on our website, rinse your hair in the evening, ventilate your accommodation before sunrise and after sunset if possible. .. pic.twitter.com/f4c5lNDrzc

— National Aerobiological Surveillance Network (@rnsa_pollen) February 15, 2024

Sources :

  • The National Aerobiological Surveillance Network (RNSA) – Allergo-pollen bulletin of April 2 and pollen allergy risk map updated on April 2, 2024
  • Ministry of Health – Pollen allergies: actions to adopt
  • Health insurance – Recognizing an allergy
  • Institut Pasteur de Lille – Pollen allergies: what to do to relieve the symptoms?
author avatar
Maeva Ferrenz