PA pollen report
Pittsburgh Pollen Report
Pittsburgh's three rivers and steep wooded hillsides make for a potent allergy mix. Oak, maple, and birch cover the hills in spring pollen, grasses run through humid river-valley summers, and ragweed fills every hillside and vacant lot in the fall. The valleys trap humid air, keeping mold active through the warm months.
Collection coming soon to Pittsburgh
PollyMap is actively recruiting a verified local partner in Pittsburgh. Be the first to know — or apply to be the partner.
While we find a local clinic
Test the air at your own home in Pittsburgh
No allergy clinic is reporting from Pittsburgh yet. Until one does, you can order your own PollyKit — a simple air sampler you hang outdoors or indoors. Send it back and the PollyKit Lab shows you exactly what's floating in your air.
- Pollen from local trees, grasses and weeds
- Airborne mold spores
- Dust mites and other indoor allergens
Hang it outdoors
See which pollen and mold are in your yard this season.
Or hang it indoors
Check bedrooms and living spaces for mold, dust mites and more.
What drives allergies in Pittsburgh
Trees: oak, maple, and birch (March – May)
Western Pennsylvania's forested hills are dense with oak (Quercus), maple, and birch. April and early May are the roughest stretch.
Grasses: June – July
Timothy and lawn grasses pollinate heavily in early summer across the metro's yards and reclaimed hillsides.
Weeds: ragweed (August – frost)
Ragweed (Ambrosia) thrives in Pittsburgh's disturbed soils — hillsides, rail corridors, and vacant lots. Counts stay elevated until a hard frost.
Mold: river-valley humidity
Humid air pooling in the valleys keeps Alternaria and Cladosporium active all summer and through damp autumns.
Pollen patterns in Pittsburgh
In Pittsburgh, tree pollen — including Birch, Oak, Maple — typically dominates from late winter through spring. Timothy grass is the most common warm-season pollinator, and Ragweed drives the largest fall pollen load.
Top trees
- Birch
- Oak
- Maple
- Beech
- Ash
Top grasses
- Timothy
- Bluegrass
- Orchard
- Rye
Top weeds
- Ragweed
- Plantain
- Pigweed
- Lamb's quarters
Top molds
- Alternaria
- Cladosporium
- Aspergillus
- Penicillium
Pittsburgh pollen calendar
Typical monthly intensity across the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| tree | ||||||||||||
| grass | ||||||||||||
| weed | ||||||||||||
| mold |
Historical reports
Cities near Pittsburgh
Explore pollen activity in nearby cities reported by the PollyMap network.
Frequently asked questions
What is the pollen count in Pittsburgh today?
PollyMap publishes real, microscope-verified pollen counts for Pittsburgh — measured from physical air samples. The latest report on this page shows current tree, grass, weed, and mold levels.
Is the pollen count high in Pittsburgh right now?
Pittsburgh's worst stretches are April–May (trees), June (grasses), and September (ragweed). The measured reports on this page show today's actual levels.
When is allergy season in Pittsburgh?
March through the first hard frost: trees in spring, grasses in early summer, ragweed from August onward, and mold through the humid months.
Why does Pittsburgh's terrain affect allergies?
The wooded hills are dense pollen sources, and the river valleys hold humid air and pollen close to where people live — valleys can run noticeably higher counts than ridgetops.
Are you an allergy clinic in Pittsburgh? Claim your territory on PollyMap.
PollyMap is a local authority-building tool for allergy clinics, ENT practices, and any clinic that offers allergy care. By becoming the Official PollyMap Partner for your part of Pittsburgh, your clinic gets credited on real pollen reports, receives ready-to-share weekly content, and becomes the go-to local expert patients trust.
We assign each partner a designated territory within the Pittsburgh metro — like a franchise territory. Pittsburgh has room for multiple partners, but once your area is assigned, it's locked to your clinic.
No clinic has claimed a territory in Pittsburgh yet. The best areas go to the first clinics that sign up — once one does, that part of town is off the table for everyone else.
Pittsburgh's distinct neighborhoods and suburbs — the North Hills, South Hills, Monroeville, Mt. Lebanon — each make PollyMap territories. First clinic in each becomes its credited pollen expert.
- Your clinic credited on every Pittsburgh pollen report
- Weekly real-sample reports and ready-to-share content under your brand
- Locked territory — competing clinics can't claim your area
- Become the go-to allergy expert in your part of Pittsburgh
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