Dust Mites, Humidity and Wet Windows: What Health Canada Advises

• Why dust mites matter
• The humidity target
• Health Canada’s checklist
• Where to measure

If your windows drip every morning, your indoor air is carrying a lot of moisture. Health Canada links that same damp air to another problem you can’t see: dust mites.

§Why dust mites matter

Health Canada describes dust mites as microscopic organisms that live in beds, carpets, furniture, plush toys and anywhere dust gathers. Dust and mites can cause allergic reactions and aggravate conditions such as asthma. Health Canada adds that exposure to dust mites has been shown to cause asthma to develop in genetically susceptible children.

§The humidity target

For dust mites, Health Canada advises improving ventilation, reducing indoor moisture, and keeping relative humidity between 35% and 50%. That fits inside its general 30–50% indoor range. Its humidity factsheet suggests the low end, 30–35%, in winter so condensation doesn’t form on cold surfaces. In a cold snap, aim for the lower part of the range and use the windows as your warning light.

Health Canada also says to run a dehumidifier in damp areas like basements, or whenever you see moisture condensing on cold surfaces such as window panes. In other words, wet glass is a signal to dry the air.

§Health Canada’s checklist

• Clean floors and surfaces with a damp mop or cloth, and cut clutter so dust has fewer places to settle.
• Vacuum carpets, curtains and soft furnishings often. Use a central vacuum vented outdoors or a HEPA vacuum.
• Encase pillows and mattresses in dust-mite-impermeable covers, and wash linens in hot water weekly.
• Throw out cushions, mattresses, pillows, stuffed toys or linens that have been wet for a long time or stored somewhere wet.
• Consider hard flooring instead of carpet. If possible, put children’s bedrooms on the highest floor rather than in the basement.

§Where to measure

Bedrooms matter most here. That’s where the mattress is, and where breath moisture builds up overnight (see morning bedroom condensation). A hygrometer by the bed shows whether you’re staying under 50% overnight.

Sources: Health Canada, Dust and dust mites; Health Canada, Relative Humidity Indoors factsheet; Health Canada, Improve indoor air quality in your home. This is general information, not medical advice.

Originally published at https://dry-glass-notes.surge.sh/articles/dust-mites-humidity-wet-windows.html (AI-assisted, sources cited). If this helped, zaps go to hollisvarrow3753@coinos.io.