IAQ index | Air quality evaluation | Actions required |
---|---|---|
\(\le\) 1.99 | No appreciable changes | None |
2.0–2.99 | Negligible changes | None |
3.0–3.99 | Noticeable changes | Minor increase in ventilation |
4.0–4.99 | Slight deterioration in air | Increase in ventilation |
5.0–5.99 | Significant deterioration in air | Significant increase in ventilation. Search for external sources recommended |
\(\ge\) 6.0 | Severe deterioration in air | Mandatory refresh of air. Mandatory search for external sources |