Is atmospheric pressure the same indoors and outdoors?

Yes, unless your house is completely airtight and you never open any doors or windows. Otherwise there is an air flow into and out of your house that equalizes the pressure. read more

Yes, unless indoors has something exerting a negative or positive influence on the pressure, such as pumping in air from outside, and only then if building ventilation isn’t sufficient to mitigate the resulting pressure differential. read more

Now only a few feet of molecules is directly above our heads. read more

In buildings equipped with mechanical exhaust, the pressure differences between indoors and outdoors before renovation varied from +10,1 to -95,0 Pa (average -7,8 Pa), and between indoors and staircases from -3,5 to -6,0 Pa (average -18,6 Pa), being lower than -5 Pa in 36% of the buildings. read more