Pollen Level
Loading
Fetching live data
Loading city data
Current Conditions
Air Quality
Loading
Fetching live data
Weather
Loading
Fetching live data
Checking today's conditions
Gathering pollen, air quality, and weather data for you.
Loading city data
Pollen Level
Loading
Fetching live data
Air Quality
Loading
Fetching live data
Weather
Loading
Fetching live data
Gathering pollen, air quality, and weather data for you.
Gathering pollen, air quality, and weather data for you.
Pollen Level
Loading
Fetching live data
Air Quality
Loading
Fetching live data
Weather
Loading
Fetching live data
Harwood Heights's allergy season is compressed but intense, running from April through October. The flat, agricultural landscape around Harwood Heights, IL produces significant grass and ragweed pollen during peak months.
Right now: September is peak ragweed in Harwood Heights. A single ragweed plant can release a billion pollen grains per season.
Spring
Apr – May
Tree pollen season is short but intense — oak, elm, and ash dominate.
Summer
May – Jul
Grass pollen peaks in June. Agricultural regions see elevated counts.
Fall
Aug – Oct
Ragweed is the dominant allergen. The Midwest is a major ragweed zone.
The flat terrain near Harwood Heights allows pollen to travel long distances on the wind. Cold fronts can temporarily drop counts, but warm spells bring rapid pollen surges. PollenTracker monitors these daily shifts.
Open another nearby forecast without going back to the map.
Google UPI 0/5
Google UPI 0/5
Air Quality
Unavailable
Live air-quality data is currently unavailable.
Weather
65°F
Rainy · 99% humidity · 7 mph wind
YES
Pollen is moderate, but rain is suppressing it. Good window to head out.
Weather: Rain can temporarily wash pollen out of the air.
Best hours: 08:00-09:00, 17:00
Some data is estimated or unavailable today.
Hourly pollen risk is estimated from weather trends when no live hourly pollen feed is available.
Informational only. Not medical advice. For health concerns, please consult a qualified healthcare provider. Editorial standards.