Allergy & air

Pollen Count & Allergy Forecast by City

What’s pollinating today, and how bad is it? Each city page leads with today’s pollen verdict, breaks out tree, grass, and ragweed levels, and plots a per-region season calendar so you can see what drives your symptoms month by month — even before any live count loads. Built on open data — no app, across 31,257 U.S. cities.

WeatherStory Allergy Index 2026

Our named annual ranking of the 100 largest U.S. metros by a modeled seasonal pollen-load index — combined tree, grass, and ragweed intensity and season length — a transparent alternative to static annual “allergy capitals” lists. See the Allergy Index 2026 report (with a season-onset map and ZIP lookup), the always-current worst-cities ranking, or the pollen & allergy statistics hub.

Pollen counts by city

The largest U.S. cities by population. Every city in the corpus has a pollen page at /pollen/[state]/[city].

Browse by state

Every state hub lists all of its cities’ pollen pages, largest first, with the state’s tree, grass, and ragweed season windows.

Pollen & allergy guides

Plain-language reference on the science behind your symptoms: what each pollen type does, when seasons peak by region, how counts are measured, and what actually brings relief.