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 14th of June

The allergy risk related to grass pollen remains mostly high to very high.The warm and sunny weather will affect the whole country these days and will bring up the concentrations of grass pollens that will still greatly disturb allergy sufferers. This heat peak should be of short duration, with the arrival of a degradation in the second part of the week that will greatly relieve allergies to grass pollen.

Olive and oak pollens remain present around the Mediterranean sea with a moderate risk of allergy. Corsica is currently experiencing a peak of pollens, the risk of allergy is high for pollens of olive, oak and grasses. Pellitory pollens continue to progress throughout the territory with a risk from low to moderate level. The pollens of plantain, sorrel and lime tree can be present everywhere in France but without any real discomfort for allergy sufferers.



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.

Forecast for ragweed polllination:

Through its measurement network and forecasting model, RNSA informs of the arrival of the first pollen grains. To date, and given the weather conditions that have prevailed since the beginning of the year, the model gives the date of 3rd of August for the occurence of the first symptoms related to ragweed pollen on the Lyonnais region. These dates can be advanced from 3 to 4 days in the south of Lyon (Rhône Valley), and delayed from 2 to 3 days in the North of Lyon (Nivernais, in particular).

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.

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