High CO2 Levels Indoors
There is a big body of evidence (see the papers in the science base) that show that in our society, most people spend 80 to 90% of the time indoors whilst the elderly and children can spend virtually every day indoors.
There is good evidence to show that average indoor CO2 concentrations in offices, schools and homes typically range from 600 to 1000 parts per million (ppm) but can exceed 2000 ppm with increasing occupancy and reduced building ventilation. Furthermore, people can spend nearly one third of their life sleeping and evidence shows that CO2 concentrations in bedrooms can exceed 3500 ppm when doors are closed for privacy and windows are closed for energy conservation. See the graphic below showing the typical build-up of CO2 concentration in a bedroom.
Office meeting rooms with high occupancy and poor ventilation can have CO2 concentrations in the 2000 to 3000 ppm range.
This is not good for our health; we need to address this issue, measure it, understand it and mitigate for it.