P repair your handkerchiefs pollen arrive

P repair your handkerchiefs, pollen arrive. "Each year, the scenario reproduces. The arrival of Spring means a wave of plugged nose, sneezing repeatedly, nasal itching, inflammation of the sinuses and eyes crying. Almost 30 of the French suffer these seasonal hassle which in the majority of cases, are temporary. "But these pollinosis are rapid increase in the population," said Monique Charron, General delegate of the French Committee for the observation of allergies (CFOA). In fact, respiratory allergies affect today not far from a French three, and between 10 and 20 of adolescents aged 13 to 14 years. For the latter, this means headaches, difficulties of concentration and "nose runny." Both disorders particularly handicapping in review period.

"The lives of these people can become a nightmare," said Michel Thibaudin, Director of the national network of aérobiologique monitoring (RNSA), which analyses pollutants and allergenic products present in the air. "My allergy penalizes me for about three months a year," says Romain Firetto, twenty-one years. This student of biology discovered the severity of his allergy to grass at the age of seventeen. He suffers from rhinitis found "moderate to severe" by specialists, with a risk of progression to chronic, other more severe asthma. After several years of ineffective treatment, Roman plans to desensitize. "Drugs such as antihistamines, tackle the symptoms of the disease and does not treat the" indicates Michel Thibaudin.

These diseases have a very strong genetic component but the crises are triggered by contact with a substance that enters the respiratory tract, without that we really understand the reason for the unusually violent reaction of the immune system "If there is an allergic parent, it has 50 chance of developing oneself allergy." If the father and mother are affected, this percentage increases to 80. "No no family history, risk is included between 20 and 25," summarizes Monique Charron.

A huge productivity

The observed resurgence of respiratory allergies seems to be the cause of the chemical pollutants tandem - pollen, especially virulent in the city. The ecological approach, which now limits the size of the herbs in parks and public gardens, reinforces this pressure to natural allergens. Some of them, very volatile, have a huge productivity. "A single plant of Ambrosia releases billions of pollen grains," said Michel Thibaudin. At the time, this expert advocates for a limitation of some trees known to be aggressive on the bronchi (birch, Sycamore and ash). "We have compiled a list of 16 tree Fort allergic potential that it would be better to avoid", he said. Between 1987 and 2008, the amount of these pollen in the air in cities has continued to increase, and the number of days with a "high-risk allergic".

A recent survey shows that the French have become aware of these risks. According to a survey by the CSA Institute in the fall of 2009, almost two thirds of them expressed concerned about the pollution of outdoor air. Approximately 70 of those who suffer from allergies involve pollution, while a half noted a worsening of their disorders in recent years. Factor aggravating complained chemical pollutants was highlighted by several investigations that confirm an upsurge in respiratory allergies in the areas near a highway or a high traffic road. A trend which may yet deteriorate with the rise to the North of certain plant varieties driven by climate change.