Pollen Count & Forecast for Tucson
About Pollen in Tucson
Tucson’s spring allergy season (February-May) is dominated by Mulberry and Juniper pollen; White Mulberry (Morus alba) widespread in residential areas; One-seed Juniper (Juniperus monosperma) drifting from the Santa Catalina Mountains. Arizona Ash (Fraxinus velutina) and Velvet Mesquite (Prosopis velutina) are prolific along Rillito River and Santa Cruz River banks. Summer (July-September) sees high Ragweed (Ambrosia) and Pigweed (Amaranthus) pollen levels, originating from Sabino Canyon and Reid Park.
Mountain ranges surround the city and trap pollen within the Tucson Basin, leading to high atmospheric concentrations. Summer and autumn see elevated Mould (Alternaria, Helminthosporium) spore counts, from damp soil in Saguaro National Park and desert washes.