Low
Pollen is low — most people won't notice
Multiple pollen types are active · Tomorrow ↓ · Updated 11 hours ago
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Pollen levels in Philadelphia are currently low. Most people should not experience allergy symptoms from pollen.
Tree pollen: Very Low. Grass pollen: Very Low. Weed pollen: None.
No, pollen conditions in Philadelphia are expected to improve tomorrow.
Philadelphia sits in a humid continental climate zone within the Mid-Atlantic's dense deciduous forest belt, giving the city a long and intense allergy calendar that typically runs from March through October.
Tree pollen kicks things off in early spring, with oak, maple, birch, sycamore, cedar, and London plane—heavily planted along Philadelphia's streets and parks—driving peak counts from late March through May. As tree season winds down, grass pollen takes over from mid-May through July, dominated by timothy, Kentucky bluegrass, orchard grass, and perennial ryegrass common across the region's lawns and suburban corridors. There is often a two- to three-week overlap in May and early June when lingering tree pollen and rising grass counts can compound symptoms significantly.
Weed season follows in August and peaks in September, led by ragweed, which thrives in the Delaware Valley, alongside lamb's quarters, pigweed, and plantain.
Beyond pollen, Philadelphia's humidity fuels year-round outdoor and indoor mold (especially Alternaria and Cladosporium), while dust mites, cockroach allergens in older row-home housing stock, and elevated urban air pollution and ozone add to the burden.
Overall, Philadelphia's allergy profile is defined by a long, overlapping three-season pollen cycle intensified by humidity-driven mold and urban air quality issues.