Indoor air can contain dust, pollen, pet dander, mold spores, smoke, volatile organic compounds (VOCs), and other pollutants.[1] Americans spend, on average, approximately 90% of their time indoors, so the air inside your home deserves some attention.[2]
Cleaner indoor air doesn’t depend on a single product or an expensive renovation. Start with what’s happening in your home. Where are pollutants coming from? Is fresh air getting in? How effective is your HVAC system filter? Is moisture under control? Once you know where the trouble spots are, improving indoor air quality becomes much more manageable.
Every home is different. Cooking habits, moisture problems, and the age of your home can all shape what deserves your attention. Understanding the basics of indoor air quality can help you figure out which concerns matter most in your home.
Key Takeaways
- Start with the source. Reduce pollutants at their source before relying on filters or air purifiers.[1]
- Let fresh air in when conditions are good. Open windows and use kitchen and bathroom exhaust fans that vent outside.[1]
- Filter the air effectively. Use the highest-rated HVAC filter your system can safely handle, and consider an air purifier for rooms where you spend a lot of time.[3]
- Keep moisture under control. Aim for indoor humidity between 30% and 50% to help discourage mold growth.[4]
- Check for hidden hazards. Carbon monoxide, radon, and lead need their own alarms, tests, and safety measures.[5]-[7]
What You’ll Need
You may already have some of these at home. Others depend on the air quality concerns you find as you work through the steps.
Helps your HVAC system capture more airborne particles. Use MERV 13 or the highest-rated filter your system can safely handle.[3]
SONA Mobion Air Purification System (optional)
Adds air cleaning in a room where you spend a lot of time.
Shark NV360 Navigator Lift-Away Deluxe Upright Vacuum (optional)
A vacuum with a HEPA filter can help capture dust and other particles that settle in your home.
ThermoPro TP50 Digital Hygrometer and Indoor Thermometer (optional)
Measures indoor humidity so you can tell when moisture levels are too high or too low.[4]
homeLabs Energy Star Dehumidifier (optional)
Helps lower humidity when moisture stays high after you’ve addressed leaks and other moisture sources.
Airthings View Plus Air Quality Monitor (optional)
Continuously monitors radon levels over time so you can track changes in your home.
Carbon Monoxide Detector (optional)
Alerts you to carbon monoxide, a gas you can’t see or smell.[5]
Step 1: Control the Sources of Pollution
Before you shop for another filter or air purifier, look at what’s putting pollutants into the air in the first place. Fumes from a home project or fuel-burning equipment that’s in poor condition can keep adding pollutants no matter how much you filter the air. That’s why the U.S. Environmental Protection Agency (EPA) recommends controlling pollutants at their source first.[1]
Control Pollutants
- Keep smoke outdoors. Avoid smoking or vaping inside the home.
- Choose lower-VOC products and ventilate while you work. Paints, finishes, and adhesives can release VOCs into indoor air. When possible, choose low-VOC or zero-VOC products and bring in fresh air while you work, provided the outdoor air is clean.[1][2] VOCs, or volatile organic compounds, vaporize at room temperature. Some can cause short-term effects such as irritation or headaches, depending on the chemical and how much you’re exposed to.[2] Choosing non-toxic products for your home can also help you take a closer look at the ingredients and materials you bring indoors.
- Keep fuel-burning equipment serviced. Have your furnace, gas water heater, and other fuel-burning equipment inspected and serviced as the manufacturer directs. Equipment that isn’t working properly can release more pollutants into your home.[2]
- Keep dust and allergens under control. Regular cleaning can reduce dust, pollen, pet dander, and other allergens that collect in the home.[2] A vacuum with a HEPA filter may also help.[2]
- Store household chemicals safely. Follow the label when storing and using pesticides, solvents, and other household chemicals. Keep them in their original containers, and don’t mix chemicals unless the label tells you to.
Renovations are another time to pay closer attention because building materials can introduce indoor pollutants.[2] If you’re renovating an existing home, Healthy Spaces offers indoor air, water, and building material assessments through its Healthy Home Certification process. For larger projects, the PRK Williams Building Group provides construction management services focused on healthier indoor environments.
Step 2: Ventilate With Fresh Air
Fresh air can be one of the easiest ways to clear out pollutants, but opening the windows isn’t always the right move. When outdoor air is clean and the weather cooperates, opening windows and doors can help dilute pollutants that have built up indoors.[1] Understanding how ventilation and air flow work throughout your home can also help you decide when opening a window is enough and when you need mechanical ventilation.
You don’t need to leave the windows open all day. Look for opportunities to bring in outdoor air when conditions are good, especially after cooking or working on a home project.[1] Opening windows or doors in different parts of the house can also help air move through the space.
Check the outdoor air first. Smoke and other outdoor pollution can make opening the house a poor choice, even on a beautiful day.[1] When outdoor air quality is poor, keep windows and doors closed.
Put Exhaust Fans to Work
Kitchen and bathroom exhaust fans tackle pollutants and moisture where they’re produced. Fans that vent outdoors can move them out of the house instead of letting them spread to other rooms.[1]
Run the kitchen exhaust fan while you cook. In the bathroom, turn on the fan during showers and baths and leave it running long enough to clear the humid air.
It’s also worth checking where the air actually goes. Some kitchen hoods send air outdoors, while others filter it and return it to the room. If you’re not sure which type you have, check the manual or look for ductwork that leads outside.
Ventilate When You Need It Most
Ventilation matters most while you’re doing something that temporarily changes the air, such as cooking or working on a home project.[1] Bring in outdoor air while you work when conditions allow, and keep the air moving for a while afterward.
Step 3: Upgrade Your Filtration
Your HVAC filter is an easy place to start because it’s already filtering air whenever your heating or cooling system runs. Check what’s installed now, then find out how efficient a filter your system can safely handle.
The EPA recommends a MERV 13 filter, or the highest-rated filter your system can accommodate.[3] Higher-rated filters capture smaller particles more effectively, but your HVAC system still needs to move air through the filter. Check the manufacturer’s instructions or ask an HVAC professional if you’re unsure what your system can handle.[3]
Change the filter as often as the manufacturer directs. If it’s heavily soiled every time you replace it, the EPA suggests changing it more often.[3]
Choosing a Portable Air Purifier
A portable air purifier can add another layer of air cleaning in a room where you spend a lot of time. You don’t need to compare every specification on the box. Start with the ones that tell you how well the unit can clean the air in your space.
- HEPA filtration. Portable air cleaners often use high-efficiency particulate air (HEPA) filters to achieve a high Clean Air Delivery Rate.[3]
- Clean Air Delivery Rate (CADR). Choose a CADR high enough for the room where you’ll use the purifier.[3]
- Room coverage. Make sure the purifier is designed to handle a room at least as large as yours.[3]
- Activated carbon. If you’re concerned about certain gases, look for activated carbon or another filter designed to capture them.[3]
Also check how often you’ll need to clean the unit or replace its filters. A purifier only helps when you keep it working as intended.
Healthy Spaces offers SONA air purification systems for different residential applications. Mobion is designed for individual rooms, while the Ducty series works with a home’s HVAC system.
One specification deserves extra attention: ozone. The EPA advises against air cleaners that intentionally produce ozone because ozone is a lung irritant.[3] Some ionizers, UV systems, and plasma air cleaners may also emit ozone.[3] Check the manufacturer’s specifications and available independent testing so you know how a system works before bringing it into your home.
Step 4: Manage Humidity
Your home may give you clues when there’s too much moisture. You might see condensation that keeps returning to the windows or notice that a basement always feels damp. Measuring the humidity gives you a clearer answer. Check your thermostat first to see whether it displays relative humidity. If it doesn’t, a hygrometer can measure it for you.
Aim to keep indoor humidity between 30% and 50%.[4]
If the number stays high, find out where the moisture is coming from. Check common trouble spots:
- Plumbing leaks under sinks or around fixtures
- Roof or window leaks that let water inside
- Bathrooms without adequate exhaust ventilation
- Damp basements or crawl spaces
- Recurring condensation on windows or pipes
Fix the source when you find it. Repairing leaks and correcting drainage or ventilation problems helps keep materials dry, which is central to controlling mold and moisture.[4]
If humidity remains high after you’ve addressed those problems, a dehumidifier can help. Choose one that can handle the size of the space, and follow the manufacturer’s directions for drainage and cleaning.
Step 5: Check for Specific Hazards
Some indoor air problems won’t announce themselves with an odor, visible dust, or a damp spot on the wall. Carbon monoxide and radon are two good examples. Older homes can also contain lead, especially in old paint.
Install and test carbon monoxide alarms. Carbon monoxide is a colorless, odorless, poisonous gas.[5] Install carbon monoxide detectors on every level of your home and outside sleeping areas. Check the batteries regularly.[5]
Test your home for radon. Radon is a radioactive gas that can enter homes, and testing is the only way to know whether you have a radon problem.[6] You can use a low-cost do-it-yourself radon test kit, use a radon monitor to track levels over time, or hire a qualified radon professional.[6]
Short-term tests generally stay in the home for two to 90 days. Long-term tests stay for more than 90 days and give you a better picture of your average radon level over the year.[6]
If your results come back high, a qualified radon contractor can help determine what your home needs. One common system uses a pipe and fan to draw radon from beneath the house and vent it outdoors. What the work costs depends on your home’s design, foundation, and the system it needs.[6]
Use lead-safe practices in older homes. Homes built before 1978 are more likely to contain lead-based paint.[7] Renovating or repairing painted surfaces can create lead dust. Before starting this type of work, the EPA recommends talking with a certified lead professional and using a lead-safe certified renovator when appropriate.[7]
A better HVAC filter or air purifier can’t replace these safeguards. Carbon monoxide needs alarms, radon needs testing, and possible lead hazards need to be handled safely.
How to Improve Indoor Air Quality, One Step at a Time
You don’t need to tackle everything this weekend. Start with what your home is telling you. Maybe the HVAC filter is overdue for a change. Maybe condensation keeps returning to a bedroom window, or you’ve never tested for radon.
Pick the issue that deserves attention first, then build from there. Cleaner indoor air comes from a few things working together: fewer pollutants entering the air, enough ventilation and filtration, moisture that’s under control, and safeguards for hazards you can’t see or smell. Once those become part of how you care for your home, improving indoor air quality becomes much easier to manage.
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Sources Cited
- U.S. Environmental Protection Agency. Improving indoor air quality. August 2026.
- U.S. Environmental Protection Agency. The inside story: a guide to indoor air quality. May 2026.
- U.S. Environmental Protection Agency. Guide to air cleaners in the home. February 2026.
- U.S. Environmental Protection Agency. A brief guide to mold, moisture and your home. February 2026.
- U.S. Consumer Product Safety Commission. Carbon monoxide. Accessed September 2026.
- U.S. Environmental Protection Agency. A citizen’s guide to radon: the guide to protecting yourself and your family from radon. May 2012.
- U.S. Environmental Protection Agency. Protect your family from sources of lead. June 2026.
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