Respira
Ragweed allergy
Ragweed is the defining allergen of the American fall. A single plant can release a billion grains of pollen in a season, and that pollen travels — it has been found hundreds of miles out to sea. For much of the eastern and midwestern United States it is the reason late summer is harder than spring.
Season
August to the first frost, peaking in September.
Pollen seasons shift with latitude and elevation — the same species can start six weeks apart in Texas and Minnesota — so treat these months as the shape of the year rather than a date to plan around. Respira shows the level measured for your own location each day.
Symptoms commonly associated with it
Commonly associated with sneezing, nasal congestion, a runny nose, and itchy or watering eyes. Symptoms tend to track the pollen curve, building through August and easing after the first hard frost.
Where it occurs
Heaviest across the Midwest and the East Coast, and along river valleys. It is present in almost every state, but the Southwest and the Pacific Coast generally see far less of it.
Track it day by day
Respira reports ragweed for your location every day, alongside the other ten species measured across the United States, air quality on the EPA scale, and a symptom diary you can export for your allergist.
Other allergens in the United States
Respira is an informational tool. It does not replace diagnosis or advice from a medical professional.