Measurement method

Indoor environmental quality (IEQ)

Also: IEQ

The umbrella concept covering air quality, thermal comfort, lighting and acoustics together — everything about a space that affects the people in it. Used in building certification (WELL, LEED, BREEAM) and in research that asks how the factors interact.

G-0082 · Updated 5 September 2026 · Coridum Research

Why it matters indoors

Indoor air quality is one of four IEQ domains. The concept matters because the domains trade off — sealing a building for acoustics or energy worsens air, opening windows for air brings in noise and heat — and because occupant satisfaction and performance respond to the combination. Coridum’s factors sit in the air-quality and thermal domains; light and noise are candidates for later inclusion.

In the literature

  1. A complete review on enhancing air circulation and filtration for improving internal air quality in a healthy school environment (2024). doi:10.31893/multirev.2023ss078 CKB 0836
  2. Associations of Indoor Carbon Dioxide Concentration and Symptoms of Sick Building Syndrome in Air-Conditioned Lecture Halls. CKB 0357
  3. Guehot Evaluation of air exchange rate and particulate matter deposition rate in a classroom… (2024). E3S Web of Conferences. doi:10.17605/osf.io/9h5br CKB 0313

Studies in the Coridum Knowledge Base in which this term is used. The definition follows standard usage in WHO, ISO and textbook sources; it is not quoted from these papers.

CKB = document number in the Coridum Knowledge Base, our curated library of peer-reviewed studies. Follow the DOI for the original paper.