Most modern European housing also has to abide by strict energy efficiency and air leakage standards, so they come with heat-recover air exchange systems.
I came here to say exactly this. I'm in Toronto Canada and just renovated a duplex, i was required to install ERV's to exchange the air. VOC's from off-gassing is unavoidable with present building materials, so the best we can do is replace the air as often as possible to minimize the impact. They're not expensive, and the impact to air quality is massive.
Air leakage standards in which direction?
Building envelopes need to be tighter
Got a Netatmo CO2 sensor recently and i think that needs to be rethought. That shit builds up fast inside a well sealed system.
That's why there are requirements around installing an air exchange system.