Ambrosia Artemisiifolia L. a Roma: una presenza non più controversa

Among the alien species reported in Latium Ambrosia artemisiifolia L. deserves special consideration because of its potential danger for allergy subjects. The spread of the species in the area is relatively recent, and it’s among those normally moni- tored by the monitoring centres in Italy and Europe. More than ten years of observations aerobiological in the city of Rome have confirmed its presence. Its concentration seems to vary in relation to precipitation occurring before the summer.