Why your modern, airtight home might be trapping more than just heat
In short: We spend roughly 90% of our time indoors, yet modern construction is making our air potentially more stagnant. As homes become tighter to improve energy efficiency, they can inadvertently trap pollutants, from cooking particles to invisible gases, creating a hidden challenge for indoor air quality.
Indoor air quality (IAQ) refers to the concentration of various compounds and pollutants within a building. While we often focus on outdoor smog, indoor air can be compromised by a wide array of sources: CO2 from human respiration, VOCs from cleaning products, formaldehyde from furniture, and even radon—a naturally occurring, invisible, and odorless radioactive gas that can seep through foundation cracks. Other common culprits include mold, dust mites, pet dander, and smoke from wood fires or cigarettes.
The challenge is intensifying because modern HVAC engineering now focuses on much tighter building envelopes. While this keeps heat or cooling inside, it can lead to stale air if ventilation is insufficient. Dr. Neha Solanki notes that IAQ is often at its worst during extreme winter or summer temperatures when windows remain closed for long periods (S3:ps3). This lack of airflow can exacerbate chronic conditions like asthma or COPD and facilitate the spread of respiratory viruses like the flu or RSV.
Mitigating these risks involves three primary strategies: source control, filtration, and ventilation. One advanced solution is the installation of an energy recovery ventilator (ERV). Acting much like the lungs of a building, an ERV introduces fresh air while preserving the existing indoor temperature. For those looking to monitor their environment, various consumer-grade monitors can track levels of CO2, radon, and VOCs via smartphone, though experts suggest carefully reviewing sensor accuracy before purchasing.
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Sources
- Summary by Intellect · source: How to Understand Indoor Air Quality | Ask This Old House
- Also: Indoor Air Quality: Why It Matters and How To Improve It
- Also: Indoor Air Quality (IAQ) | US EPA
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