| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| standard oxygen level in air | 1.95 | 0.5 | 3311 | 52 |
| minimum oxygen level in air | 0.26 | 0.9 | 6922 | 23 |
| oxygen level in the air | 1.41 | 0.2 | 5139 | 56 |
| what is the standard oxygen level | 0.2 | 0.8 | 7851 | 60 |
| normal oxygen percentage in air | 1.44 | 0.3 | 6721 | 44 |
| normal oxygen level in breathing air | 0.43 | 0.3 | 8185 | 14 |
| normal oxygen content in air | 1.72 | 0.2 | 4042 | 86 |
| oxygen % in normal air | 0.77 | 0.8 | 6835 | 31 |
| normal oxygen concentration in air | 1.42 | 0.1 | 6898 | 65 |
| oxygen levels in air quality | 1.46 | 0.4 | 3465 | 12 |
| normal oxygen level in atmosphere | 1.55 | 0.6 | 9497 | 44 |
| what is the average oxygen level | 0.84 | 0.2 | 9210 | 76 |
| normal atmospheric oxygen levels | 1.46 | 0.9 | 4811 | 35 |
