When you see Barometric pressure on weather map or just visiting online to see what the pressure might be at the airport, the values have been adjusted. Pressure readings are adjusted to sea level.

Letter Published: 31 May 1958 Barometric Pressure and Altitude E. S. WILLIAMS Nature 181, 1527 (1958) Cite this article ...

Currently, most airliners have cabin air pressure equivalent to that of an altitude of 8,000 feet. For the Dreamliner, Boeing cut that down to 6,000 feet.

Barometric pressure sensors measure atmospheric pressure accurately. They are extremely sensitive and can provide instantaneous measurements. Modern devices can detect pressure differences as small as ...