Inclusion Criteria:  Age 18-25 Medically treated / physician diagnosed mild seasonal asthma GINA guidelines step 1 or 2 (https://ginasthma.org/) Never smoker or ex-smoker ≥ 6 months Allergy > 1 common allergy  Exclusion Criteria:  Any other disease that could influence the study parameters Conditions that prevent safe access to the climate chambers (such as claustrophobia) Perennial asthma Need for continuous medical treatment for asthma Pregnancy