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Photo of 4 trees in each season Photo of 4 trees in each season

Changes in the Air

Indoor Air Quality Challenges and

What you Need to Know

A group of four icons, one for each season
Indoor Air Quality (IAQ) is constantly changing with the seasons as environmental factors like humidity, allergens, and pollutants fluctuate. From winter's dry air to spring's pollen surge these shifts place extra demand on your HVAC system, requiring dynamic adjustments to maintain healthy air.

Explore How Air is Affected
by Each Season

Winter
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Winter
Blurred out image of a winter landscape
Closed Windows, Circulating Viruses
Cold weather pushes people indoors, and heating systems dry out the air, creating ideal conditions for respiratory infections like colds, flu, and COVID-19 to spread. Dry indoor air can irritate mucous membranes and reduce the body's natural defenses, while poor ventilation allows viruses and airborne pollutants like mold to circulate more easily.
An icon of mold Mold
An icon of a virus Viruses
Maintaining Healthy Indoor Air During Winter
Humidifiers, HVAC maintenance, and regular air circulation help maintain moisture levels and reduce the spread of airborne illnesses in winter.
Understand Winter IAQ Risks
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Spring
Blurred out image of a spring landscape
Warmer Temperatures, More Particulates
As temperatures and humidity rise in spring, pollen, dust, and mold can easily enter indoor spaces through open windows, affecting air quality and triggering allergies. Seasonal cleaning and renovation activities may also release TVOCs, compounding the impact of both outdoor and indoor pollutants.
An icon of pollen Allergens
An icon of a cloud Outside Factors
How to Combat Springtime Allergens Indoors
Regular cleaning, sealing gaps, and checking ventilation systems help keep allergens and pollutants from impacting indoor air during spring.
Explore Spring IAQ Challenges
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Summer
Blurred out image of a summer landscape
More Cooling, Less Circulation
Heat and humidity in summer can lead to elevated levels of dust, mold, and moisture indoors, which impact air quality and reduce system efficiency. Frequent use of air conditioning may dry out the air and limit ventilation, creating stagnant indoor conditions that affect occupant comfort and health.
An icon of pollen Allergens
An icon of smoke Smoke
Optimizing Air Quality During the Summer
Regularly clean ducts, monitor indoor humidity levels and check filters monthly to ensure effective cooling and maintain clean indoor air.
Break Down Summer IAQ Concerns
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Fall
Blurred out image of a fakk landscape
Moisture Builds, Indoor Impacts
As people spend more time indoors, moisture from decaying vegetation and pollen from fall plants can elevate mold and allergen levels inside. These seasonal changes can trigger respiratory sensitivities and worsen indoor air quality, especially in buildings with poor ventilation or water intrusion issues.
An icon of pollen Allergens
An icon of smoke Smoke
An icon of mold Mold
Maintaining Healthy Indoor Air During Fall
Ensure proper ventilation, address leaks promptly, and clean air ducts and HVAC filters to reduce mold and allergens inside. 
See What Else Fall Brings to IAQ

For Whatever Stage You're In, Fellowes Air Quality Experts Are Here To Help:

Making your indoor air quality strategy simple starts here. Get expert answers, assess your space, or explore solutions that put you in control. Let's find the right starting point for your needs.
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Explore Our Seasonal Insights
Stay informed about indoor Air Quality and HVAC trends as the seasons change.
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