How to Test Your Indoor Air Quality and Breathe Better

Home air quality testing is important even for homes with healthy individuals

Written by Ed Oswald

Last updated:

how to test your indoor air quality - a indoor air quality monitor is pictured.

Indoor air quality is a crucial aspect of our health and well-being that often goes unnoticed. With people spending an estimated 90% of their time indoors, the quality of the air we breathe inside our homes, workplaces, and schools can significantly impact our overall health. Poor indoor air quality has been linked to various health issues, such as allergies, asthma, and other respiratory problems. This blog post discusses how to test indoor air quality and identify who might benefit most from these tests.

In some cases, exposure to hazardous indoor air pollutants may lead to long-term health effects or even death. This underscores the importance of testing and monitoring indoor air quality to ensure a safe and healthy environment for you and your loved ones.

How to test your indoor air quality

It’s not difficult to test your home for various indoor pollutants. Below we explain how to test air quality accurately.

Step 1: Identify Indoor Air Pollutants

The first step in testing indoor air quality is identifying the possible pollutants in your indoor environment. Common indoor air pollutants include:

  • Particulate matter (PM) is tiny particles suspended in the air, such as dust, pollen, and mold spores, which can exacerbate allergies and respiratory problems.
  • Volatile organic compounds (VOCs) are chemicals emitted as gases from certain solids or liquids, such as paints, cleaning supplies, and building materials. VOCs can cause eye, nose, and throat irritation, headaches, and nausea.
  • Biological contaminants, including bacteria, viruses, and mold, can cause or worsen respiratory and other health problems.
  • Combustion pollutants are gases and particles produced by burning materials, such as carbon monoxide and nitrogen dioxide, which can be toxic at high concentrations.
  • Radon is a naturally occurring radioactive gas with serious health consequences if left unchecked. When radon gas is present in the home, it can lead to severe lung cancer and other respiratory illnesses.

Step 2: Choose the Right Testing Method, and Run Your Air Quality Tests

Once you have identified the potential indoor air pollutants, it’s time to choose the appropriate testing method. There are several ways to test your indoor air quality, including:

  • Do-it-yourself (DIY) indoor air quality test kits are available online or at local home improvement stores. They are designed to test for specific pollutants like mold, radon, or VOCs. These kits are relatively affordable and easy to use but may not be as accurate as professional testing.
  • Portable air quality monitors can measure multiple pollutants, such as PM, VOCs, and humidity. They offer an easy way to continuously monitor indoor air quality, but they may not cover all pollutants and might not be as accurate as professional-grade equipment.
  • Professional indoor air quality testing: If you suspect severe indoor air quality issues or want the most accurate results, consider hiring a professional. Certified indoor air quality consultants have the expertise and equipment to comprehensively assess your indoor environment.

Step 3: Interpret the Results and Take Action

After testing your indoor air quality, it’s essential to interpret the results and take appropriate action to improve your indoor environment. If you find high levels of pollutants, consider the following steps:

  • Improve ventilation. Open windows and doors, use exhaust fans in bathrooms and kitchens and consider installing an air exchange system to increase fresh air circulation.
  • Control sources of pollutants. Remove or reduce the sources of indoor air pollutants, such as using low-VOC products, properly storing chemicals, and regular cleaning to minimize dust and mold.
  • Use air purifiers. Consider investing in air purifiers with HEPA filters, which can effectively remove particulate matter and some VOCs.

How do I know if my indoor air quality is bad or good?

To determine if your indoor air quality is good or bad, consider the following indicators:

  • Odors and smells: Persistent or unusual odors can signal poor indoor air quality, especially related to mold, mildew, or chemical sources.
  • Humidity levels: High humidity can encourage mold growth and dust mite proliferation, while low humidity can cause dry skin and respiratory issues. Ideal indoor humidity levels are typically between 30-50%.
  • Ventilation: Proper ventilation is essential for maintaining good indoor air quality. Check for drafts, ensure vents are not blocked, and consider opening windows to allow fresh air to circulate.
  • Health symptoms: If occupants experience allergy-like symptoms, such as coughing, sneezing, headaches, or irritated eyes, this could indicate poor indoor air quality.
  • Visible mold and pests: Mold or pests like rodents or insects can negatively impact indoor air quality.
  • Air quality monitors: Devices that measure pollutants, such as carbon monoxide, volatile organic compounds, or particulate matter, can provide quantitative data on your indoor air quality.

By paying attention to these indicators, you can better understand whether your indoor air quality is good or bad and take appropriate action if necessary.

how to test your indoor air quality - a indoor air quality monitor is pictured.

Who should test air quality in their homes?

Testing indoor air quality is essential for everyone, as it can help identify potential health hazards and improve overall well-being. However, certain individuals may benefit more from regular indoor air quality testing, including:

  • People with allergies, asthma, or other respiratory issues: Poor indoor air quality can exacerbate existing respiratory problems or trigger allergic reactions. Regular testing and monitoring can help maintain a healthier environment for those with sensitivities.
  • Families with young children: Children, especially infants and toddlers, are more vulnerable to the adverse effects of indoor air pollutants due to their developing respiratory systems and higher breathing rates. Ensuring a safe indoor environment is essential for their well-being.
  • Pregnant women: Exposure to certain pollutants, such as VOCs and particulate matter, may negatively affect the mother and the developing fetus. Pregnant women should prioritize maintaining a healthy indoor environment.
  • Elderly individuals: Older adults may have weakened immune systems or pre-existing health conditions that can be aggravated by poor indoor air quality. Ensuring a clean and pollutant-free environment is crucial for their well-being.
  • Occupants of newly renovated or constructed homes: New building materials, paints, and adhesives can release VOCs and other pollutants into the indoor environment. Testing air quality after renovating or moving into a new home can help identify and address any issues.

Indoor air quality testing is essential to maintaining a healthy living environment. By identifying potential pollutants, selecting the right testing method, and taking appropriate action, you can create a safe and comfortable space for you and your loved ones.


Those with respiratory issues, young children, pregnant women, the elderly, and occupants of new or renovated homes may benefit the most from regular indoor air quality testing.

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Ed Oswald

Ed Oswald has nearly two decades of experience in technology and science journalism, and specializes in weather stations and smart home technology. He's written for Digital Trends, PC World, and TechHive. His work has also appeared in the New York Times. When he isn't writing about gadgets, he enjoys chasing severe weather and winter storms.