Longevity by Design · Pillar · IAQM
Indoor Air Quality Metric
Published: June 2026 · Updated: August 2026
The Indoor Air Quality Metric is the third pillar of Longevity by Design. It holds fine-particulate (PM2.5) concentrations below 5 µg/m³. That threshold comes from the WHO 2021 global air quality guidelines. Delivery combines HEPA-13 filtration, mechanical ventilation with heat recovery (MVHR) and continuous monitoring. People spend roughly 90% of their hours indoors. Indoor air quality is therefore the largest controllable exposure most people have.
The risk is formally classified. IARC, the WHO's cancer agency, lists particulate air pollution as a Group 1 carcinogen (2013). In many Turkish, Eastern European and South Asian cities, outdoor PM2.5 runs three to five times the WHO threshold. Without specified filtration, the indoor environment simply mirrors that harmful baseline. Sustained exposure below 5 µg/m³ is associated with lower cardiovascular and respiratory disease incidence.
Frequently asked
What is the Indoor Air Quality Metric?
It is the air pillar of the Longevity by Design methodology. The specification keeps indoor PM2.5 below the WHO limit of 5 µg/m³. Delivery uses HEPA-13 filtration, heat-recovery ventilation and continuous monitoring.
Why is indoor PM2.5 important?
Particulate air pollution is a Group 1 carcinogen per IARC, the WHO cancer agency (2013). People spend about 90% of their time indoors. Keeping PM2.5 below 5 µg/m³ is associated with lower cardiovascular and respiratory risk.