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  2. Why your asthma is worse in the winter — and how to ... - AOL

    www.aol.com/lifestyle/why-asthma-worse-winter...

    Too little humidity dries out your nasal passages and can also affect your breathing. Too much can lead to the growth of asthma triggers, such as mold and dust mites.

  3. Why your asthma is worse in the winter — and how to ... - AOL

    www.aol.com/why-asthma-worse-winter-breathe...

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  4. Humidity - Wikipedia

    en.wikipedia.org/wiki/Humidity

    High humidity can often have a negative effect on the capacity of chemical plants and refineries that use furnaces as part of a certain processes (e.g., steam reforming, wet sulfuric acid processes). For example, because humidity reduces ambient oxygen concentrations (dry air is typically 20.9% oxygen, but at 100% relative humidity the air is ...

  5. Harmattan - Wikipedia

    en.wikipedia.org/wiki/Harmattan

    Humidity can drop lower than 15%, which can result in spontaneous nosebleeds for some people. [7] Other health effects on humans may include conditions of the skin (dryness of the skin), dried or chapped lips, eyes, and respiratory system, including aggravation of asthma .

  6. Dust mite allergy - Wikipedia

    en.wikipedia.org/wiki/Dust_mite_allergy

    Allergy patients are advised to keep the relative humidity below 50%, if possible. Very few mites can survive if the humidity is less than 45% (at 22 °C (72 °F)). However, they can survive if the humidity is high just for an hour and a half per day, for example due to moisture released to the air when cooking food. [21]

  7. The air in your home could be making you sick – here’s how to ...

    www.aol.com/air-home-could-making-sick-184905028...

    Irritants in the air can affect the health and effectiveness of your respiratory system, make it more difficult to breathe and can cause allergic reactions and flare-ups for people who suffer from ...