Breathe Easier: How to Improve Indoor Air Quality in Older Homes

Introduction

Indoor air quality is vital to your health. Older adults spend nearly all their time inside, making clean air in the home a top priority, according to the U.S. Environmental Protection Agency (EPA). Poor air quality is linked to chronic health conditions, including asthma, heart disease, and cognitive decline. By identifying environmental hazards, healthcare providers and families can work together to create healthier living spaces.

The Challenge of Older Residential Infrastructure

Older homes rarely have the advanced mechanical ventilation systems found in new, energy-efficient buildings. While modern homes are built “tight” to save energy—requiring artificial ventilation to remain healthy—older homes are often “leaky.” This natural air exchange can help dilute pollutants, but it also allows for uncontrolled moisture, pests, and outdoor contaminants to enter.

Common Pollutants in Aging Houses

* Combustion Byproducts: Nitrogen dioxide and carbon monoxide often stem from aging gas stoves or unvented heaters.
* Biological Contaminants: Mold, dust mites, and pests thrive in damp areas with poor airflow.
* Radon: This naturally occurring radioactive gas can seep into homes through foundation cracks. The EPA recommends testing all homes, as levels above 4.0 pCi/L require mitigation.
* Particulate Matter: Dust and debris often originate from aging building materials or outside air infiltration.

Evidence-Based Mitigation Strategies

Experts agree that indoor air quality management should follow a hierarchy of controls: prioritize source control, followed by ventilation and air cleaning (LBNL/BIES, 2023).

1. Prioritize Source Control

Reducing pollutants at the source is the most effective way to improve air quality.
* Transition to Electric: Replace gas stoves with induction cooktops to eliminate nitrogen dioxide.
* Moisture Control: Maintain indoor humidity between 30 and 50 percent to prevent mold. Use dehumidifiers in basements and repair plumbing leaks immediately (CDC/EPA guidelines).
* Radon Reduction: Install sub-slab depressurization systems if testing reveals elevated levels.

2. Ventilation and Filtration

When source control is not enough, mechanical systems help clean the air.
* Mechanical Ventilation: Retrofitting older homes with Energy Recovery Ventilators (ERVs) provides a controlled way to bring in fresh outdoor air while saving energy.
* Portable Air Cleaners: Use devices with HEPA filters to reduce indoor PM2.5 levels, especially during wildfire season.

Clinical Implications for Caregivers

Reducing household air pollution exposure can lower blood pressure and improve respiratory health in older adults. We recommend that clinicians include home environmental assessments in routine care for patients with chronic conditions.

Environmental Health Checklist for Homeowners

* [ ] Test for radon every two years.
* [ ] Check humidity levels (target 30-50%).
* [ ] Inspect gas appliances for proper venting.
* [ ] Replace air purifier filters every 3-6 months.

Conclusion

Improving indoor air quality is a key step in supporting the health of our aging population. By focusing on source control, proper ventilation, and filtration, we can turn aging houses into safe, comfortable homes.