Very High Pollen in O'Fallon, MO

About pollen in O'Fallon

Weed pollen is dominating the air in O'Fallon today, reaching a very high level that is likely to bother even those with mild sensitivities. Tree and grass pollen, by contrast, are barely registering and shouldn't cause much concern. If you're prone to seasonal allergies, today is the kind of day where symptoms like sneezing or itchy eyes are most likely to show up, so it may be worth limiting time outdoors during peak hours if you can. Looking ahead, weed pollen is expected to remain very high for the next couple of days before dropping sharply, tapering to a quiet, low level by the end of the forecast period. Grass pollen should stay low and steady throughout, while tree pollen remains a minor factor for now. This pattern fits the season: ragweed, the main culprit behind fall weed pollen, typically peaks in late summer and September before fading as temperatures cool. Once it clears, allergy relief should follow until oak, maple, and other common regional trees begin releasing pollen again in spring.

What to do today

• Avoid mowing the lawn and raking leaves.
• When driving the car, close your windows and turn the air conditioning system to recirculation mode.
• Keep your windows closed and turn on your air purifier or air conditioning.
• Consider staying indoors during the peak pollen hours (morning and early afternoon).
• Make sure to use an air purifier with HEPA filter in your home, especially in your bedroom. Don't forget to perform regular filter maintenance checks.

Common questions

What is the pollen count in O'Fallon, MO today?

O'Fallon, MO is at a very high 5 out of 5 on the Universal Pollen Index today, driven mainly by weed pollen. Over the next five days it ranges from 0 to 5 of 5.

Is weed pollen high in O'Fallon, MO right now?

Weed pollen is very high today at 5 of 5, and it's in season now. Most allergy sufferers will have symptoms.

What plants are causing allergies in O'Fallon, MO?

The main sources right now are Ragweed. Ragweed (Asteraceae (the daisy family), Late summer, fall) is actively pollinating.