Inclusion Criteria:  Person 18 years of age and older, Person suffering from seasonal allergic rhinitis (hay fever, pollen allergy), Person with an android and/or IOS smartphone and having the possibility to connect to the internet (via phone subscription or WIFI connection), Person agreeing to install the MASK-air application (medical device) on his personal smartphone, Person agreeing to activate their GPS when using the MASK-air® application for the study, Person having read and understood the information note and having signed their participation agreement prior to any specific study procedure.  Exclusion Criteria:  Person who did not sign their participation agreement, Person who has difficulty understanding or reading the information note, Person planning to spend a significant percentage of time outside the area of interest (e.g., due to frequent business or personal travel), Person declaring to be under guardianship, curatorship or safeguard of justice.