There is a saying that
"every action has an equal and opposite reaction".
There is a big push towards LEED certified homes, and that is not a bad thing necessarily, but it has it's challenges.
(which are usually never considered even by the highest of authorities....)
https://www.usgbc.org/leed
Old houses "breathed".
They were often made of lathe and lime plaster which was a slow permeable barrier.
They expelled heat and moisture accumulated during the day through interior pressure. Then new outside air is naturally cycled in.
Nature abhors a vacuum.
The common theory is to seal everything interior up in a structure. And then be done.
Many problems still exist at the "Dew Point":
The place where warm hot air meets cold and turns into condensation. Leading to drips and puddles.
And moisture attracts further problems.
Especially when freezing is involved.
Most interior "dust" is composed of shed human skin cells and pet hair.
The "off-gassing" of new construction materials cannot be underestimated. (search:Chinese drywall recall)
Carpets are also a main suspect.
For your consideration:
https://files.catbox.moe/6pg6ha.mp4