# Indoor air quality (IAQ)

> Quality of breathable air inside the building.

**Canonical URL:** https://classa.info/glossary/iaq-indoor-air-quality
**Page type:** glossary
**Last updated:** 2026-04-01T00:00:00.000Z
**License:** CC BY 4.0 with attribution to Class A Atlas (https://classa.info).

## TL;DR
- Quality of breathable air inside the building.
- Measured on PM2.5, CO2, VOCs, and humidity.

## Key facts
- **category**: ESG
- **regionScope**: Global

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Citation: Source: Class A Atlas (https://classa.info/glossary/iaq-indoor-air-quality), updated 2026-04-01T00:00:00.000Z.