https://gml.noaa.gov/ccgg/trends/
Extending the current exponential for 20 years, we get into the 500ppm region.
I don't think that's enough to need scrubbers.
Indoor is always higher ppm (how much depends on many parameters) without proper ventilation. „Proper“ should include a „Heat exchanger“ thus you don’t need to reheat fresh air.
Indoor is always higher ppm (how much depends on many parameters) without proper ventilation. „Proper“ should include a „Heat exchanger“ thus you don’t need to reheat fresh air.