Le Réseau National de Surveillance Aérobiologique (R.N.S.A.)

is the French aerobiology network in charge of the analysis of the content of the air in biological particles, and to give some information about their health impact. This activity began in 1985 to the Pasteur Institute. It is a private association "RNSA" since 1996.

RNSA collect pollen and moulds in the air, and clinical data, from 70 towns in France. In each great town, RNSA has a pollen trap (Burkard or Lanzoni), an analyst and a clinician. RNSA has nearly 65 pollen traps located on a central urban position over the roof of building, to be representative of the trend air quality.



Select a county on the map or in the list below :

  • Allergy risk:
  • nul
  • very low
  • low
  • moderate
  • high
  • very high

Vigilance map, updated 24th of May

The allergy risk related to grass pollen will be between the moderate and high levels on the country especially when the sun shines, except during rain showers.

Olive and oak pollen will be present mainly on the Mediterranean coasts with a low or moderate risk. Pellitory and cypress will also be present in this area with a risk of allergy not exceeding the low level.

Sorrel and plantain pollens will be only weakly present throughout the territory with a very low allergy risk.


Roland Garros 2019

Allergy risk forecast for the 26th of May

Smartphone Apps

- The Alerte pollens app will help you to live your allergy without staying at home! Consult the RNSA pollen alerts, advices to handle your allergy day by day and services like weather forecast or air quality. You can configure up to 5 pollens and 5 departments. You can also activate the geolocation which will help to automatically display informations about the area you travel. Available on Play store and Apple store.

- The Pollen app, now available for France, provide a personnal pollen forecast for the 3 days to come in your area, taking into account your informations from the pollen diary and calculate your personnal level of exposure. Symptôms of allergy can be recorded and compared with the pollination in the pollen diary. Available on Google Play et l'App Store.


Modelling in aerobiology makes pollination forecasts based on data of the previous years and on the weather forecasts of the days to come. These forecasts are not based on data recorded previous days/weeks. Modelling allows to get an overview of what to expect for the days to come, even if these forecasts are not 100% reliable. The following links are only for guidance.

Forecast for grass pollination:

Follow the pollination forecast of grass in France via COSMO-ART or SILAM projects.

Start of the grass pollen season
If the first grass pollens has already been in the air since several weeks, the pollen season has not really started yet. Here are some dates for the beginning of the pollen season:
- Toulouse: the 1st of May
- Lyon: the 17th of May
- Nantes: the 20th of May
- Strasbourg: the 23rd of May
- Montluçon: the 24th of May
- Paris: around the 25th of May
- Amiens: around the 28th of May
- Rouen: around the 30th of May

Back to the top of the page