| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| co2 safe levels in room | 1.72 | 0.4 | 2831 | 4 |
| what is a safe level of co2 in a room | 0.05 | 0.9 | 4186 | 84 |
| safe co2 levels in home | 1.6 | 0.8 | 6127 | 13 |
| co2 levels in room | 1.26 | 0.6 | 9265 | 71 |
| safe indoor co2 levels | 0.04 | 0.2 | 6818 | 63 |
| safe levels of co2 indoors | 1.2 | 1 | 632 | 84 |
| safe levels of co2 | 1.41 | 0.7 | 8525 | 20 |
| normal co2 levels in room | 1.59 | 0.9 | 9977 | 5 |
| safe co2 levels in confined space | 1.68 | 0.4 | 7489 | 27 |
| what are safe co2 levels | 1.73 | 0.6 | 7525 | 1 |
| safe co2 levels ppm indoors | 0.24 | 0.7 | 7993 | 70 |
| normal co2 in room | 1.99 | 0.6 | 129 | 51 |
| safe level of co2 in the atmosphere | 0.68 | 0.5 | 446 | 42 |
| safe working co2 levels | 1 | 0.9 | 3694 | 94 |
| acceptable co2 levels in an indoor space | 1.11 | 0.1 | 7881 | 41 |
| safe human co2 levels | 0.61 | 1 | 1880 | 57 |
