| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| oxygen content of air at sea level | 1.75 | 0.5 | 524 | 91 |
| oxygen content of air at 5000 ft vs sea level | 1.59 | 0.8 | 1551 | 95 |
| percentage of oxygen at sea level | 0.35 | 0.6 | 9721 | 27 |
| oxygen level at sea level | 0.02 | 0.3 | 1727 | 21 |
| oxygen at sea level | 1.77 | 1 | 5832 | 84 |
| concentration of oxygen at sea level | 1.44 | 0.2 | 9284 | 71 |
| oxygen level at sea level and elevation | 1.26 | 0.8 | 5563 | 97 |
| level of oxygen in air | 0.77 | 0.8 | 5155 | 51 |
| oxygen content of air | 1.64 | 0.7 | 5941 | 65 |
| oxygen levels in air and water | 1.79 | 0.3 | 1400 | 80 |
| oxygen levels in the ocean | 1.92 | 0.9 | 2853 | 100 |
| average oxygen level in air | 1.58 | 0.9 | 9264 | 60 |
| how much oxygen comes from the sea | 0.35 | 0.5 | 8770 | 59 |
| standard oxygen level in air | 0.01 | 0.8 | 9349 | 22 |
| normal oxygen content in air | 0.56 | 0.8 | 6221 | 28 |
| oxygen content in seawater | 1.73 | 0.7 | 1464 | 34 |
| how much oxygen is in the ocean | 0.73 | 0.4 | 3943 | 52 |
