To your scarves. The risk of pólenes allergy is a high in three quarters of the territory according to the latest evaluation of the National Aerobiological Surveillance (RNSA) network. The 79 departments are placed on red alert this Wednesday, February 19. They were 30 days ago.
Only Brittany, Normandy and most Hauts-de-France are rather saved and have an allergic risk that is considered “average.”
“It is essentially the climatic conditions that are decisive in the program and the dispersion of the policy,” explains Samuel Monnier, engineer of the RNSA. “Sweet temperatures, a little wind, a very sunny climate, without rain in the program … conditions that really promote the emission in large amounts of polenes in the air and that will embarrass a lot of allergic,” abounds the specialist.
A spring air extends over the country in mid -week with temperatures above seasonal normality. As of this Thursday, and at least until Sunday, the thermometer will rise above 10 ° C in the north half, it will often remain above 15 ° C during the southern half.
Avellana, Alders, Cipress ash …
In the southwest and southeast of France, the allergies are likely to be particularly sensitive to the polenses of Cupresacea-Taxaceae produced by cypresses, Thuyas or even junnings. The ashes pollen will generate an average risk of allergy, as well as memos in the south.
Hazelnuts and Alders will release Pólvanos in large quantities throughout the country. These trees “They were ready to bloom,” said Samuel Monnier. “Some first pollens and early February have already published, but the amounts were still quite low due to time.” New temperatures and rainy showers have left Pollens a few chances of walking in the air.
If the northwest of the country still has a risk of average allergy, the situation could evolve in the next few days with the accentuation of the Redoux.
The RNSA engineer tells us that it is not abnormal “to have many departments in red in February” because it is “the usual flowering period” of the species mentioned above.
However, he points out that these The species still flourish “before and before.” The hazelnut, for example, releases pollens in December for four or five years. “A dozen or twenty years ago, we didn’t have it at all in December.” A “precocity” that links “very sweet winters of recent years.”
Source: BFM TV
