Appendix
Carbon Dioxide Levels and Guidelines
| CO2 Level | Description |
|---|---|
| 400 ppm | Normal outdoor air level. |
| 400-1000 ppm | Typical level indoors with good ventilation. |
| 1000-2000 ppm | Poor air quality - requires ventilation. |
| ≥ 2000 ppm | Headaches, sleepiness and stagnant, stale, stuffy air. Poor concentration, loss of attention, increased heart rate and slight nausea may also be present. |
| 5000 ppm | Workplace exposure limit (as 8-hour TWA) in most jurisdictions. |
| > 40000 ppm | Exposure may lead to serious oxygen deprivation resulting in permanent brain damage, coma, even death. |