Indoor Air Quality Checklist: A Practical Room-by-Room Guide

We spend most of our time indoors, so the air in our homes shapes how comfortable we feel. The US Environmental Protection Agency explains that indoor pollutant levels can be higher than outdoor ones, and it organizes advice around three strategies: source control, ventilation and air cleaning. Read the agency's introduction to indoor air quality for the full framework. Below is a practical version you can tick off.

Start with source control

Removing a source is the most effective step, because you are not trying to clean up afterward.

• Do not allow smoking or vaping indoors. This is the single biggest source in homes where it happens.
• Choose low-emission paints, cleaners and furnishings when you can, and store solvents in a garage or shed rather than living space.
• Replace scented sprays, plug-ins and incense with unscented options if they irritate you.
• Have fuel-burning appliances such as furnaces, water heaters and gas stoves inspected, and install carbon monoxide alarms near sleeping areas.
• Test for radon, a naturally occurring radioactive gas. The EPA recommends testing every home.

Kitchen

• Run the range hood or an exhaust fan while cooking, ideally one vented outdoors.
• Use the back burners when possible, since they are better covered by the hood.
• Clean up spills and food waste promptly to avoid pests and mold.

Bathroom and laundry

• Run the exhaust fan during showers and for 20 minutes or so afterward.
• Wipe away visible condensation and fix leaks quickly.
• Dry laundry fully and vent the dryer outside.
• Replace moldy shower curtains instead of leaving them.

Bedroom

• Wash bedding in hot water on a regular schedule to limit dust mites.
• Use zippered covers on mattresses and pillows if dust is a trigger.
• Keep pets off the bed if pet dander bothers you.
• Think about whether the air is very dry or very damp. Our post on humidity and throat comfort explains the sweet spot.

Living areas

• Vacuum with a HEPA-rated vacuum and damp-dust surfaces instead of dry-sweeping them into the air.
• Take shoes off at the door to reduce tracked-in dirt and pollen.
• Keep indoor plants if you like them, but do not expect them to purify air in any meaningful way.

Ventilation and filtration

Fresh air dilutes indoor pollutants. Open windows when outdoor conditions are good, such as when pollen counts and wildfire smoke are low. Check your HVAC system and replace filters at the interval the manufacturer recommends. If you use a portable air cleaner, look for one sized for your room and avoid models that intentionally generate ozone. The EPA's page on air cleaners and filters explains what to look for.

Moisture and mold

Mold needs moisture. Keep indoor relative humidity roughly between 30 and 50 percent, fix roof and plumbing leaks, and dry wet materials within a day or two. A basic hygrometer costs little and takes the guesswork out. If you see large patches of mold or have had flooding, consider professional help.

What this does and does not do

A cleaner home may reduce irritation, but it is not a treatment for any condition. If you have persistent cough, wheeze or breathlessness, talk with a clinician rather than assuming the house is the cause. Environment changes complement medical care; they do not replace it. The same goes for supplements. BreathiZen, for instance, is described on its label as a respiratory wellness spray, and our overview of the product explains what that does and does not mean. For seasonal triggers specifically, see seasonal airway irritants.

Common mistakes to avoid

People trying to clean their air often make well-meaning errors. Heavy fragrances and sprays add chemicals rather than remove them. Ozone-generating gadgets marketed as air purifiers can produce a lung irritant. Running a dusty filter, or the wrong size filter, wastes effort. Sealing a house tightly to save energy without thinking about ventilation can let pollutants build up. And cleaning mold with undiluted products in a closed room can expose you to fumes. Mix cleaners only as the label directs, ventilate while using them and wear gloves as recommended.

Finally, remember that numbers beat guesses. A hygrometer for humidity, a carbon monoxide alarm and a radon test each cost little and provide real information. If you have a particularly stubborn concern, such as odors with no clear source, ask a qualified professional to inspect heating and ventilation equipment rather than buying gadgets blindly.

A 15-minute starting plan

• Check that smoke and carbon monoxide alarms work.
• Replace the HVAC filter if it is overdue.
• Run the bathroom fan and check for leaks.
• Order a radon test kit.
• Open the windows for ten minutes if outdoor air is clean.