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121 - ATPL - What is the approximate composition of the dry air by volume in the troposphere?

Question 121 - Meteorology - ATPL - Airline Transport Pilot license

88 % oxygen, 9 % nitrogen, and the rest other gasses
10 % oxygen, 89 % nitrogen, and the rest other gasses
50 % oxygen, 40 % nitrogen, and the rest other gasses
21 % oxygen, 78 % nitrogen, and the rest other gasses

Training tests and timed exam simulations ATPL - Airline Transport Pilot license