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1 TABLE <br /> VOLUME PERCENT OF OXYGEN IN NORMAL AMBIENT AIR AT VARIOUS ALTITUDES <br /> Altitude Oxygen Indication Altitude <br /> t Oxygen Indication <br /> In Feet (Percentage) In Feet (Percentage) <br /> ' <br /> -1000 21 6 4500 176 <br /> ' -500 21 2 5000 17 3 <br /> Sea Level 208 5500 17 0 <br /> ' 500 204 6000 167 <br /> 1000 20 1 6500 164 <br /> ' 1500 19 7 7000 161 <br /> 2000 19 3 7500 15 7 <br /> ' 2500 190 8000 154 <br /> 3000 18 3 8500 15 2 <br /> 3500 18 3 9000 14 9 <br /> ' 4000 18 0 9500 146 <br /> 4500 176 10,000 14 3 <br /> ' 5000 17 3 <br /> 1 <br /> 1 <br /> 0 - 15 <br /> 1 <br />