Birmingham, AL Pollen Levels Today

Birmingham, Alabama consistently ranks among the most challenging U.S. cities for allergy sufferers, largely due to its humid subtropical climate, long growing season, and position in a valley surrounded by wooded foothills of the Appalachians that trap pollen and pollutants.

Tree pollen launches the allergy year early, often beginning in late February and peaking through April, with oak, pine, cedar, juniper, birch, hickory, sweetgum, and sycamore producing especially heavy loads—pine pollen coats surfaces in yellow each spring. As tree season winds down, grass pollen rises from late April through July, dominated by Bermuda, Johnson, Timothy, and Bahia grasses, with the tree-grass overlap in May often intensifying symptoms.

Weed season follows from August through the first frost in late October or November, driven by ragweed, pigweed, lamb's quarters, and sagebrush, with ragweed being the most potent fall trigger.

Beyond pollen, Birmingham's persistent humidity fuels year-round outdoor and indoor mold growth, particularly Alternaria and Cladosporium, while dust mites thrive in humid homes. The metro area's ozone levels and vehicle-related pollution can further aggravate respiratory symptoms.

Overall, Birmingham's allergy profile is defined by a long, overlapping pollen calendar, high mold burden, and humidity-driven intensity that leaves few truly symptom-free weeks.