Philadelphia, Missouri Pollen Count

Frequently asked

When is pollen worst in Philadelphia?

The late-summer ragweed run is the headline in Philadelphia: weed pollen peaks Aug–Nov, the longest and most punishing window of the year here. Tree pollen comes first (Feb–Apr) and grass bridges the gap (Apr–Sep), but it's the ragweed stretch that floors most sufferers. Currently, grass pollen is what's driving counts this month.

What's in the air in Philadelphia right now?

Right now grass pollen leads in Philadelphia at a Very Low (1/5) level. The species actually in the air today: Oak and Grasses. On a quiet live day, Philadelphia's seasonal calendar fills in what's typically airborne this time of year.

Is tree or grass pollen higher in Philadelphia in spring?

In spring, tree pollen leads in Philadelphia — trees pollinate Feb–Apr, ahead of grass (Apr–Sep). The handoff is the tail of the tree window: tree counts taper as grass climbs, so an early-spring flare is more likely tree pollen and a late-spring one more likely grass.

What makes Philadelphia's pollen season distinctive?

Philadelphia sits in the warm, humid subtropical Southeast zone, which means an unusually long, overlapping season — the warm climate stretches grass across much of the year and pushes ragweed deep into autumn. That shapes when symptoms hit and which allergen to watch.

How do I reduce pollen exposure in Philadelphia?

Through Philadelphia's peak windows (tree Feb–Apr, grass Apr–Sep, ragweed Aug–Nov), keep windows shut and run AC on recirculate; counts run highest on dry, warm, windy mornings, so push outdoor activity to late afternoon or just after rain, which clears pollen from the air. A HEPA purifier indoors, a saline rinse after being outside, showering before bed, and starting antihistamines a week or two before your worst local window all measurably cut symptoms.

What pollen index counts as high?

Pollen is reported on a categorical scale — None, Low, Moderate, High, and Very High. "High" and above means most allergy sufferers notice symptoms even with brief outdoor exposure, and sensitized people should limit time outside and pre-medicate. "Low" to "Moderate" usually only affects highly sensitive individuals.