| A | Area of a zone, [m2] |
| ACH | Air change rate, [h−1] |
| CH2O | Formaldehyde |
| CO2 | Carbon dioxide |
| E, NE, NW, SE, SW, W | Cardinal points: E—East; NE—Northeast; NW—Northwest; SE—Southeast; SW—south-west; W—West |
| ECC | Elderly Care Centers |
| HVAC | Heating, Ventilation, and Air Conditioning |
| IAQ | Indoor Air Quality |
| IEQ | Indoor Environment Quality |
| I/O | Indoor/Outdoor ratio |
| LNEC | National Laboratory for Civil Engineering |
| Max | Maximum |
| Min | Minimum |
| MT | Margin of Tolerance |
| MV | Mechanical Ventilation |
| N | Number of measurement points |
| n | Number of values measured to average 8 h |
| NV | Natural Ventilation |
| Perc | Percentage of time that exceeds a certain value |
| q | Air flow rate, [m3/h] |
| RH | Relative Humidity, [–] |
| RR | Restroom |
| T | Temperature, [°C] |
| T mp | Running mean outdoor temperature, [°C] |
| TVOC | Total Volatile Organic Compounds |
| VOC | Volatile Organic Compound |
| Greek symbols | |
| Δ | Difference |
| μ | Mean |
| σ | Standard deviation |
| Subscripts | |
| av | Average (arithmetic mean) |
| ext | Referring to the exterior |
| i | Referring to a zone |
| int | Referring to the interior |
| Max | Maximum |
| RECS | Referring to Ordinance 353-A/2013 |
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