Table 1 The effects of increasing CO2 concentrations in the air on human health (after Ikeda et al. 1989; Hathaway et al. 2004; Hansell and Oppenheimer 2004; Hansell et al. 2006; Cantrell and Young 2009)
| % CO2 in air | Physiological effects on humans |
|---|---|
| 5 | perceptible increase in respiration |
| 6 to 10 | shortness of breath, headaches, dizziness, sweating, general restlessness, visual disturbances, tremors |
| 10 to 15 | impaired coordination and abrupt muscle contractions, tachycardia |
| 20–30 | loss of consciousness and convulsions |
| >30 | can result in death in 1–10 min |