Assessment of Indoor Air Quality Parameters in Singapore
1. Assessment of indoor air quality parameters
The sampling probe should be located between 75 and 120 cm from the floor at the centre of the room or an occupied zone. There should be at least one sampling point taken outside as baseline for comparision.
2. Guideline maximum concentrations for specific indoor air contaminants
| Parameter | Averaging time | Limit for acceptable indoor air quality | Unit |
|---|---|---|---|
| Carbon dioxide |
8 hours |
1800 1000 |
mg/m3 ppm |
| Carbon monoxide |
8 hours |
10 9 |
mg/m3 ppm |
| Formaldehyde |
8 hours |
120 0.1 |
micrograms/m3 ppm |
| Ozone |
8 hours |
100 0.05 |
micrograms/m3 ppm |
Note
The guidelines specified have a wide margin of safety such that even if they are exceeded occasionally, toxic effects are unlikely to occur.
3. Recommended maximum concentrations for specific classes of contaminants
| Parameter | Limit for acceptable indoor air quality | Unit |
|---|---|---|
| Suspended particulate matter* | 150 | micrograms/m3 |
| Volatile organic compounds** | 3 | ppm |
| Total bacterial counts | 500 | CFU***/m3 |
| Total fungal counts | 500 | CFU/m3 |
*respirable particles with aerodynamic diameters less than 10 m sampled with a size selective device (commonly used devices; cyclones and impactors) having a median cut size of 4 m and the following penetration characteristics:
| Particle aerodynamic diameter, m | Respirable particulate mass, % |
|---|---|
| 0 | 100 |
| 1 | 97 |
| 2 | 91 |
| 3 | 74 |
| 4 | 50 |
| 5 | 30 |
| 6 | 17 |
| 7 | 9 |
| 8 | 5 |
| 10 | 1 |
**total photoionisable compounds, reference to toluene
***colony-forming units
4. Guideline values for specific physical parameters
| Parameter | Range for acceptable indoor air quality | Unit |
|---|---|---|
| Air temperature | 22.5-25.5 | degree celsius |
| Relative humidity | < 70 | % |
| Air movement* | < 0.25 | m/s |
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