Allergy Guides and Resources

Daily ranking of the US cities with the highest pollen levels right now. See where tree, grass, and weed pollen is hitting hardest today.

What drives spring tree pollen, which species cause the most symptoms in each region, and what you can do to manage your allergies from February through May.

Rain knocks pollen out of the air temporarily, but counts often spike 24 to 48 hours later as plants rehydrate and release more. The full story of rain, pollen, and thunderstorm asthma.

Pollen counts follow a daily cycle. Tree pollen peaks mid-morning, grass pollen midday, and counts drop in late afternoon. Plan your outdoor time around the curve.

There is no single pollen season. Tree, grass, and weed pollen overlap from February through November. A full calendar breakdown by type and region.

Wind is the primary way pollen travels. Learn why windy days are worse for allergies, how wind speed changes your exposure, and what to do about it.

An honest look at quercetin, butterbur, stinging nettle, vitamin C, and bromelain. What the evidence says, what it does not, and when OTC is the better choice.