Why Fall Allergies Are Worse in Ohio: Mold, Ragweed, and Immune Response Explained

If you’re sniffling your way through October, you’re not alone. Fall allergies hit hard in Ohio, and there’s more going on than just some extra dust in the air.

Let’s dig into the science of why fall allergens like mold and ragweed are especially aggressive this time of year, and what you can do to breathe easier.

The Ragweed Factor

Ragweed is the king of fall pollen. Just one ragweed plant can release up to a billion grains of pollen in a single season.

Ohio is a hotspot for ragweed due to its rural-urban mix, and the peak pollen count usually hits from late August through October.

Pollen grains are tiny but mighty — your immune system sees them as invaders, triggering histamine release. That’s what causes itchy eyes, sneezing, and congestion.

Mold Spores Thrive in Fall

Unlike pollen, which comes from plants, mold allergies stem from fungi. And fall weather is their playground: decaying leaves, damp soil, and cooler temps are ideal conditions for mold spores.

These spores float through the air, especially on windy or rainy days, and are easily inhaled. For allergy sufferers, mold exposure can lead to coughing, post-nasal drip, and even asthma flare-ups.

How Antihistamines Actually Work

Antihistamines target histamine receptors in your body to block the allergic response.

There are two main types:

First-generation (like diphenhydramine) which can cause drowsiness
Second-generation (like loratadine or cetirizine) which are longer-lasting and non-sedating

For best results, take them proactively, especially during peak pollen or mold exposure days.