Pollen Count & Forecast for Pittsburgh

Pittsburgh’s spring allergy season (March-May) is dominated by Oak and Maple pollen; Oak (Quercus) prolific in Schenley Park and Frick Park; Maple (Acer) widespread across the East End. Birch (Betula) contributes significantly from the slopes of Mount Washington. Summer (May-July) sees high Grass (Poaceae) pollen levels, originating from banks of the Allegheny River. Late summer has heavy Ragweed (Ambrosia) concentrations from Highland Park.

Deep river valleys and steep hills trap pollen, leading to localised high concentrations. Autumn and winter see elevated Mould (Alternaria, Cladosporium) spore counts, from decomposing leaf litter in city parks and damp riverfront environments.