"Support to Allergen-Free
Environment" Project ID
HUSRB/1002/122/195

Concentration of pollen in the air from 21 plant types is monitored from the beginning of February until the first days of November including the tree flowering season (February to May), grass/weed (May to July) and weed (July to November). An allergy stoplight is a way of daily reporting about the quantity of pollen grains in the air above a certain area which usually appears in the newspaper or in the media.

Ambrosia (lat. Ambrosia artemisiifolia) is a genus of invasive weeds, one of the most common and most dangerous allergic plants in the world. It was brought from America by transoceanic ships at the end of 19th century, and since then it has been spreading steadily and unstoppably.Ambrosia is a hardy annual plant, from 20 cm up to 2 m high. It sprouts from the middle of April and flourishes until late summer and fall. Previous researches have shown that ambrosia is particularly dangerous in the flowering period, i.e. from July until September.