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| Table 1: Recommended carbon dioxide concentrations in indoor air | |
| CO2 concentration (ppm) | Recommended quality rating |
| 300-400 | Typical background (atmospheric) concentrations |
| 600 | Good indoor quality |
| 800 | BSRIA control level for acceptable indoor air quality (short-term exposure) |
| 1000 | WHO (1984) concentration of limited or no concern (short-term exposure) |
| 5000 | 8 h occupational exposure limit |
| 6600 and above | WHO (1984) concentration of concern (short-term exposure) |