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Safety warnings about CO2

CO2 Safety warning

Carbon dioxide (CO2) is not toxic in itself. Nevertheless, the higher the CO2 level, the more the human breathing and brain functioning are affected. Persons with respiratory problems like asthma may be affected at a low level like 1000 ppm where other people will not feel any discomfort. But for the hazardous high levels in excess of 6 000 ppm, the CO2 caused discomforts are totally reversible. The affected person just has to go breathe in a lower CO2 level place like outside until the discomfort disappears as the CO2 level in blood lowers.

The following table shows CO2 levels associated with various experienced discomforts, symptoms and serious risk.

ConcentrationSituation Symptoms and feelings
600 - 800 ppm Office or well vented dwelling
 None
1000 ppm Acceptable level for closed room
 Possible symptoms for asthmatics and beginning of « intellectual fatigue » for sensitive persons
1200 - 2000 ppm
  • Many people in a poorly vented meeting room
  • Unvented bedroom occupied for 4-8 hours
  • Indoor garden enriched in CO2
  • Poorly vented or airtight house (air exchanger recommended)
  • Poorly vented office, factory, school room (more ventilation air exchanger recommended)
 Yawning and drowsiness or dizziness
Asthma and previous symptoms increasing
5000 ppm High limit for a continuous exposure during 8 hours Only for tolerant persons
Previous symptons reinforced
6000 - 30 000 ppm Short exposure only Fainting possible prior to death*
3000 - 8000 Out of control indoor garden CO2 enrichment Breathing and cardiac rythms increase
10 000 ppm +   Nausea, vomitting, dizziness, fainting
20 000 ppm +  

Fainting rapidly and death* is likely if nobody acts rapidly to get the affected person to breath less CO2 concentrated air

* CO2 being heavier than Oxygen, the latter is pushed up and replaced by CO2. Unconcious person lying down dies by suffocation.

 

Developped by Numérique Technologies

Last updated on : September 7, 2010

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