While having acceptable air quality indoors is important, setting strict rules on air quality levels that are hard to measure and can change based on room occupant activity is not a good idea. Instead, we should focus on regularly checking that ventilation systems work properly as they were designed to, like the Obligatory Ventilation Checks done in Sweden. 

The proposed carbon dioxide levels are meant to reduce the spread of respiratory viruses. However, the study this proposal is based on did not actually measure ventilation! Since viruses can also spread through close contact, we cannot be sure that these ventilation measures would really have the intended effect of slowing virus transmission. More research is needed to justify setting stricter ventilation requirements.