Towards Healthy Levels of Carbon Dioxide in Schools of the National Oil Company of Abu Dhabi
Table 1
Description of indoor air quality on the basis of CO2 concentrations.
Indoor CO2
Description of indoor air quality
350–400 ppm
Normal background concentration in outdoor ambient air
400–1,000 ppm
Concentrations typical of occupied indoor spaces with good air exchange
1,000–2,000 ppm
Complaints of drowsiness and poor air
2,000–5,000 ppm
Headaches, sleepiness, and stagnant, stale, stuffy air. Poor concentration, loss of attention, increased heart rate, and slight nausea may also be present
5,000 ppm
Workplace exposure limit (as 8-hour TWA) in most jurisdictions
>40,000
Exposure may lead to serious oxygen deprivation, resulting in permanent brain damage, coma, even death