Environmental protection agency. According to official website, the People's Government of Hohhot, the pollen detection in Hohhot was started on July 8, 2022, and the Hohhot Environmental Protection Bureau set up a 1 10 pollen monitoring station to detect the pollen concentration of wormwood. Artemisia pollen belongs to a kind of allergen. Usually allergic people are allergic because they inhale pollen from Artemisia. General situation hay fever belongs to type I allergic reaction according to Gail and Combs classification.