Elements impacting us

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CO2 concentrations

The amount of carbon dioxide in a building is usually related to how much fresh air is being brought into that building. In general, the higher the CO2 level in the building, the lower the amount of fresh air exchange. Therefore, examining levels of CO2 in indoor air can reveal if the HVAC systems are operating within guidelines.

  • 400 ppm - average outdoor air level
  • 400 - 1,000 ppm - typical level ranges found in occupied spaces with good air exchange
  • 1,000 - 2,000 ppm - level associated with complaints of drowsiness and poor air, often resulting in low performance
  • 2,000 - 5,000 ppm - also known as the typical occupational limit.
  • 5,000 ppm - This is the permissible exposure limit for daily workplace exposures.
  • 30,000 ppm - very harmful and hazard levels

[*source https://bubblynet.com/blog/post/co2-and-wellbeing-part-2]

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Everyone's reaction is different

A person's reaction to chemicals depends on several things, including individual health, heredity, previous exposure to chemicals including medicines, and personal habits such as smoking or drinking. It’s also important to consider the length of exposure to the chemical, the amount of chemical exposure, and whether the chemical was inhaled, touched, or eaten.

Air quality 



Air speed 

Temperature and productivity

Numerous different studies have been done to quantify the relationship between operating temperature and productivity. However, it is difficult to design good methods for performing this type of test. One of the more referenced studies on the relationship between air temperature and performance shows that on average, performance increases during office work with the temperature up to 21-22 ° C and then decreases by about 2% per degree temperature increase Ref. (Seppänen et al. 2006)

However, from an productivity point of view, the optimal temperature does not necessarily coincide with what is perceived as good comfort.