| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| tropical ozone hole and montreal protocol | 0.67 | 1 | 6795 | 80 |
| the montreal protocol related to ozone | 0.63 | 0.6 | 2188 | 35 |
| montreal protocol ozone layer | 0.97 | 0.7 | 1806 | 69 |
| montreal protocol for ozone depletion | 0.04 | 0.4 | 4920 | 55 |
| ozone depleting substances montreal protocol | 1.62 | 0.7 | 5368 | 27 |
| ozone hole at tropics | 1.25 | 0.6 | 3311 | 28 |
| international protocol to protect ozone layer | 1.65 | 0.2 | 621 | 15 |
| ozone layer hole australia | 1.44 | 0.1 | 2760 | 84 |
| ozone therapy protocols pdf | 1.05 | 0.2 | 5967 | 19 |
| the ozone layer hole | 0.87 | 0.5 | 8392 | 9 |
| ozone hole australia fixed | 0.92 | 0.1 | 5191 | 6 |
| hole in ozone layer 2021 | 0.23 | 0.3 | 8215 | 42 |
| protocol for ozone depletion | 0.69 | 1 | 9804 | 70 |
| ozone hole in australia | 0.14 | 0.8 | 1342 | 53 |
| current ozone layer hole | 1.31 | 0.6 | 7029 | 2 |
