The pressure indoors is usually very similar to the pressure outdoors, though there are cases where it's different. A much bigger related issue for us is altitu

The pressure indoors is usually very similar to the pressure outdoors, though there are cases where it's different. A much bigger related issue for us is altitude. The pressure by your feet is measurably different than the pressure by your head due to the altitude difference. So you can imagine it's a lot of noise as people move around and go upstairs, hills, etc. We're working with researchers who are writing papers on the calibration of networks of pressure sensor data (Cliff Mass' lab, specifically) in order to help us solve this problem.