The 7 Worst Seasonal Allergies

If you're reading this through watery eyes while reaching for your third tissue of the morning, you're not alone. Over one in three adults and one in four children suffer from seasonal allergies, and this year is shaping up to be one of the worst allergy seasons on record.

The culprit? Climate change is creating a perfect storm for allergy sufferers. The freeze-free growing season lengthened in 87% of U.S. cities analyzed since 1970. These 172 cities saw their freeze-free season lengthen by 20 days on average. 

What does that mean? Well, plants have more time to produce pollen, creating longer, more intense allergy seasons that are merging into one continuous cycle of misery.

But here's some good news. Armed with the right knowledge and tools—like our revolutionary new Airmega 350 and 450 with HyperVortex™ technology—you can take control of your indoor air quality and breathe easier all year long.

 

1. Winter-Spring Tree Pollen (January-May)

Forget waiting for spring flowers—tree pollen season now starts as early as December in southern states. In late March, Atlanta recorded a pollen count of over 14,000 grains per cubic meter, classified as "extremely high". The usual suspects include:

• Birch
• Oak
• Cedar
• Maple

Start allergy medications two weeks before your local tree pollen season begins. Check daily pollen forecasts and stay indoors during peak morning hours.

 

 

2. Spring Flower Pollen (March-June)

While beautiful, spring flowers release wind-borne pollen that travels for miles. Unlike insect-pollinated flowers with heavy, sticky pollen, wind-pollinated plants produce fine, lightweight pollen designed to travel right into your airways.

Create a "clean zone" in your bedroom using the Airmega 350, which efficiently purifies spaces up to 2,640 square feet. Its real-time air quality monitoring shows exactly when pollen levels spike.

 

3. Spring-Summer Grass Pollen (April-August)

Grass pollen causes most late spring and summer pollen allergy symptoms from April through early June. Common culprits include:

• Bermuda grass
• Kentucky bluegrass
• Timothy grass
• Ryegrass

After outdoor activities, immediately shower and change clothes. Leave your shoes at the door to prevent tracking pollen throughout your home.

 

 

4. Summer Mold (June-September)

Warm, humid conditions create ideal breeding grounds for mold, both outdoors and in your home. Bathrooms, basements, and kitchens are particularly vulnerable.

Keep indoor humidity below 50% and run air purifiers continuously in moisture-prone areas. The Airmega 450's coverage of up to 3,285 square feet makes it ideal for whole-floor protection.

 

5. Late Summer Ragweed (August-October)

Ragweed season may last 6 to 10 weeks until the first frost. A single ragweed plant can produce up to one billion pollen grains, and these microscopic particles can travel hundreds of miles on the wind.

Use the Airmega's customizable Allergen+ filter, specifically designed to target pollen, pet dander, and common allergy triggers.

 

 

6. Fall Mold (September-November)

Falling leaves mixed with morning dew or rainfall become mold incubators. Raking leaves releases millions of spores into the air.

Wear an N95 mask when doing yard work, and immediately wash clothes and shower after outdoor activities. You’ll want to use the Airmega's Auto Mode to automatically adjust filtration when mold spores are detected.

 

7. Christmas Tree Syndrome (December)

That fresh pine scent comes with a hidden cost—Christmas trees harbor multiple microscopic mold spores that multiply in your warm home. If you’re using a real tree, hose it down and let it dry completely before bringing it indoors. You’ll also want to position your air purifier near the tree to capture released spores.

 

Your Science-Backed Defense Strategy

When it comes to defending your home against allergens, Coway's advanced air purifiers deliver proven results. Our filtration technology captures 99.97% of airborne particles down to 0.01 microns—that's smaller than most bacteria and viruses. 

Whether you choose our compact Airmega 100 for bedrooms, the versatile Airmega Mighty AP-1512HH for living spaces, or our new powerhouses—the Airmega 350 and 450 with revolutionary HyperVortex™ technology—you're getting laboratory-tested protection. 

Plus, with customizable filter options like our Allergen+ filter, specifically designed for pollen and seasonal triggers, you can tailor your defense to match your specific allergy challenges. The result is cleaner air that lets you breathe easier, sleep better, and actually enjoy being in your own home, even during peak allergy season.

 

Fight Back Against Pesky Allergies

With more than 100 million people in the U.S. experiencing allergies and climate change extending allergy seasons indefinitely, the question isn't whether you need better air quality—it's how quickly you can achieve it.

Don't wait for symptoms to worsen. Explore the complete Airmega lineup and find the perfect solution for your space. Because when it comes to allergies, the best defense is a proactive offense, and cleaner air is just a breath away.