The air quality standards in the Code of well-being at Work are generic and cross-cutting and are defined on two levels:
  
Standard Level A        

  • the concentration of CO2 in a room is generally less than 900 ppm (which means that CO2 represents 0.09% of the volume of the air considered)  

Or   

  • there is a minimum ventilation or purification flow rate of 40 m3/h per person present, of which at least 25 m³/h per person present, is fresh air from outside. 

 
Standard Level B   

  • the concentration of CO2 in a room is generally less than 1,200 ppm (which means that CO2 represents 0.12% of the volume of the air considered) 

Or  

  • there is a minimum ventilation flow rate of 25 m³/h per person present.  

The higher the flow rates, the lower the concentrations of viruses and other pollutants in the room.