Allergens risk has generally increased throughout the past 12 weeks, reaching higher levels mid-period and sustaining an elevated risk in the current week compared to earlier weeks.
Allergy risk levels are based on pollen counts, mold spore measurements, and air quality data from monitoring stations. The index reflects the combined burden of tree, grass, and weed pollen along with indoor/outdoor mold activity.
Data is updated daily during high-pollen seasons and every 2–3 days during winter months.
Sources: AAAAI pollen stations, NAB, EPA AirNow, Hubbub World allergy model
Last updated: May 24, 2026
Data refreshed weekly