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QNH is a Q codes defined as the barometric pressure at an airport adjusted to sea level using the ICAO Standard Atmosphere. On the ground, an altimeter set to QNH reads the elevation of the airport.

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How can I work out Sea Level Pressure from QNH?

I am a little confused, is the QNH the current pressure at Sea Level? … If not could someone please advise me on how to back calculate sea level pressure given the QNH and ground temperature. …