It isn't quite that easy. Even if there aren't impediments to opening a window a crack, it is not guaranteed that passive measures will reduce CO2 levels.
I've been tracking my home office's CO2 level for about a year and a half and obviously opening a window helps, but there are certain conditions (pressure, temperature, wind?) that require fans to normalize the levels.
I've been tracking my home office's CO2 level for about a year and a half and obviously opening a window helps, but there are certain conditions (pressure, temperature, wind?) that require fans to normalize the levels.