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Classification of IAQ according to PN-EN 13779 [29].
| Category | Description of Indoor Air Quality (IAQ) | Increase of CO2 Concentration in Relation to CO2 Concentration in Outdoor Air (∆CO2, ppm) |
|---|---|---|
| IDA 1 | High | ≤400 |
| IDA 2 | Medium | 400–600 |
| IDA 3 | Moderate | 600–1000 |
| IDA 4 | Low | ≥1000 |
