I visit a friend in Sweden the other day. Her house was built in the 80s, nothing fancy, a simple one family house. There is a ventilation system integrated. Every room has an inlet and the air is sucked out of the bathrooms and kitchen. Even has a heat exchanger. It's a pretty simple system: no cooling and it's not really used for heating except for pre-heating the incoming outside air with the energy in the exhaust air. But it exchanges the houses air multiple times a day. She told me this has been standard there for decades. A few ventilation pipes integrated into the houses construction and that's it. It's even mandatory in multi tenant houses to check air flow every few years.

It's not just the AC crazy US where HVAC is standard. It's just common sense to have such a system if you care about your health.