Interestingly, the articles I find about ventilation are indeed concerned about air quality. However, in my country, at least in the cities I've lived on, the idea of ventilation is mostly associated to cooling indoors (with air quality being a desirable byproduct). Maybe the differences between our climates led to differences between the concepts behind the same word. Or maybe there's a better word in English to express what I'm intending to (sorry, English is not my mother language).