PollenTracker — Should We Go Outside Today?

Overview

Free daily pollen & allergy forecast for 800+ cities. A clear YES, CAUTION, or NO answer — built by a dad for allergic kids.

Different pollen types have different thresholds. The National Allergy Bureau categorizes counts (grains per cubic meter of air) like this:

For most allergic kids and adults, symptoms start at the medium threshold. By high, expect persistent congestion and watery eyes; very high counts often trigger asthma flare-ups.

Key Features

• Should I go outside today?
• Pollen Across the US & UK
• Worst Pollen Cities Right Now
• Pollen Count Levels
• What pollen count is considered high?
• How we decide YES, CAUTION, or NO
• Pollen & Allergy FAQ
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• Pollen count today for 800+ US & UK cities — with a clear YES, CAUTION, or NO answer.

Details

Tree pollen peaks from March to May (oak, birch, maple, and cedar are the heavy hitters). Grass pollen takes over from May to July (Bermuda, ryegrass, timothy). Ragweed dominates August through October — a single plant can release up to a billion grains per fall season. Southern states start earlier; Northern states have a compressed but intense season.

UK hayfever season runs from late March through September. Tree pollen (mainly birch and alder) peaks April-May; grass pollen — the main trigger for most UK hayfever sufferers — peaks May-July; weed pollen extends into September. Scotland's season typically runs 2-3 weeks later than England. Hayfever affects roughly 1 in 4 adults in the UK.

Three main pollen types drive most allergy seasons. Tree pollen (March-May): oak, birch, maple, cedar in the US; birch and alder in the UK — heaviest in dry, windy mornings. Grass pollen (May-July): Bermuda, ryegrass, timothy. Weed pollen (August-October): ragweed dominates the US fall, with nettle and dock more common in the UK. We track the dominant type per city per day and weight it into the overall YES/CAUTION/NO score.