Health and Comfort Effects of Elevated CO₂ Levels
CO₂ is typically measured in parts per million (ppm). Here’s what the numbers mean:
| CO₂ Level (ppm) | Meaning | Action |
|---|---|---|
| 400–800 ppm | Fresh air levels | Ideal range |
| 800–1,200 ppm | Mild discomfort may begin | Open windows or run ventilation |
| 1,200–2,000 ppm | Reduced cognitive function, drowsiness | Ventilate immediately |
| 2,000+ ppm | Headaches, sluggishness, possible health concerns | Take immediate action |
| 5,000+ ppm | OSHA exposure limit for 8-hour work shift | Unsafe for extended time |
Monitors that display CO₂ can help you identify ventilation problems quickly. If you see levels consistently above 1,000 ppm, your space likely needs more fresh air.