At what height does oxygen decrease?

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Tags

1. #fahrenheit
2. #makes
3. #pressure
4. #levels
5. #oxygen
6. #temperature
7. #there
8. #chart
9. #although
10. #altitude
11. #atmospheric
12. #percentage
13. #normal
14. #celsius
15. #safety
16. #lower
17. #contains
18. #altitudes
19. #level
20. #constant
21. #assumes
22. #degrees
23. #atmosphere