ABOUT US ALLERGIES PATIENTS SCIENCE NEWS CENTER CAREERS Find your location Allergies Allergic diseases Outdoor allergies Outdoor allergies Market environment Living with allergies Indoor allergies Outdoor allergies ALLERGIES OUTDOOR ALLERGIES Seasonal allergic rhinitis affects millions of people. Symptoms range from a runny nose and congestion to allergic asthma. Why wait? Respiratory allergies follow a chronic and progressing disease course. Allergic rhinitis symptoms may worsen over time, especially when left untreated. Globally, over 400 million people suffer from allergic rhinitis (source: Canonica GW. Etb al. Allergy 2007;62 (suppl. 85)). Learn more about the allergy patient journey Seasonal allergic rhinitis affects millions of people around the world. Seasonal allergies cause symptoms such as allergic conjunctivitis (itchy, red and watery eyes), allergic rhinitis (sneezing, blocked or runny nose, swelling and itching in the oral area) psychological symptoms (fatigue, irritability, poor sleep, negative effect on concentration and performance) and allergic asthma with a dry cough and shortness of breath. Seasonal allergens include: Pollen Pollens are suspended in the air on sunny and warm days, they can be carried by the wind over several kilometers. The amount of pollen ion the atmosphere is lower on rainy days as well as on cold and humid days. Pollens responsible for respiratory allergies come from three categories: Trees Tree pollen which can trigger allergies include: the Betulaceae family (birch) the Fagaceum family (beech, oak) the Oleacceae family (ash, olive tree) the Cupressaceae family (cypress, juniper, cedar) Their pollination period is spread over several months (from March to September in the Northern hemisphere) and varies from one species to another. Grasses The Poaceae (grass) family includes more than 12,000 différent species. Grasses are found in gardens, lawns, forests as well as on water or on rocks. Even a tiny concentration of grass pollen is enough to trigger an allergic reaction. Fodder and cereal grasses which can trigger allergies include: dactylic (cocksfoot or orchard grass), timothy, sweet vernal, ryegrass and bluegrass. In the Northern hemisphere their pollination period extends from March to September with peaks in May, June and July. Weeds Species from the herbaceous family have soft and supple stems. Their pollens, which are small and light, can remain suspended in the atmosphere for a long period of time and can be carried over long distances. Herbaceous weeds which can trigger an allergic reaction include: mugwort, nettle, lamb’s quarters, ragweed, sage, Russian thistle… Aromatic plants such as lemongrass, tarragon, and wormwood are part of the same family (Asteraceae). Their pollination season in the Northern hemisphere goes from March to September with peaks in July, August and September. Mould Fungi can be found both outdoors (fallen leaves, compost, grasses, etc.) and indoors in damp areas (bathroom, kitchen, etc.). The spores released by the fungi can be carried by wind and dew. The microscopic size of fungi spores, which ranges from 3 to 10µm), enables them to easily penetrate the respiratory tract. Mould can trigger respiratory allergies, both on a seasonal and perennial basis, such as allergic rhinitis, conjunctivitis and asthma. The most common moulds which trigger allergic reactions are: alternaria alternate (indoor and outdoor mold) penicillium and cladosporium (which are present outdoors but predominant indoors) aspergillus: a type of mold which can trigger immediate reactions (sneezing, cough, skin rash) as well as more critical reactions such as pulmonary aspergillosis (pulmonary disease) Pollen allergies > Nicolas, living beyond pollen allergy > Pollen is one of the most common triggers of seasonal allergies which stretch from spring to autumn. Individuals allergic to pollen experience symptoms such as sneezing, coughing, nasal congestion, nasal discharge, red and itchy eyes, headaches as well as itching of the palate, nose and ears. Pollens can also cause allergic asthma. © 2021 Stallergenes Greer Site Map Terms & Conditions Modern Slavery Act Statement Contact Cookie Policy Personal Data Protection Policy Cookies Reject and continue STALLERGENES GREER uses technical cookies essential for the functioning of the site as well as audience measurement cookies. You can accept audience measurement cookies by clicking on “Accept” or reject them by clicking on “Reject and continue”. You can change your mind at any time by clicking on “Cookies Management” and manage your preferences by clicking on “Set your preferences”. For more information, please read our Cookie Policy Set your preferences Accept