Does High Humidity Make Asthma Worse?

Does Humidity Influence People with Asthma

Yes, high humidity can make asthma worse for many people. At the turn of spring and summer, the increase of floating objects such as moisture, pollen, dust, mites, and fur in the air requires more attention to the dehumidification and purification of indoor air. Apply an HVAC system with dehumidifier to ensure that asthma patients can smoothly pass the period of the seasonal changes.

How High Humidity Triggers Asthma

Thicker, heavier air

Humid air feels "heavier" and can be harder to breathe, especially for those with asthma or other respiratory conditions.

Mold growth

High humidity (usually above 60%) creates the perfect environment for mold and mildew, both of which release spores that can trigger asthma attacks.

Dust mites thrive

Dust mites love humid conditions — and they're a major indoor allergen that can worsen asthma.

Increased airway inflammation

Some people are more sensitive to moist air, which can irritate the airways, leading to tightness, coughing, and wheezing.

Poor indoor air quality

High humidity can trap pollutants or chemical fumes (like from cleaning products), keeping them in the air longer and further irritating the lungs.

Ideal Indoor Humidity for Asthma:

Keep the relative humidity between 30–50%.

Use a dehumidifier for asthma, especially in basements or humid climates. For improving your living environment, it is recommended to use a whole house dehumidifier which can not only control indoor humidity but refresh indoor air.

Make sure the space is well-ventilated.