| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| what gases are in air | 0.99 | 0.8 | 745 | 35 |
| what gases are in air pollution | 1.92 | 1 | 3668 | 66 |
| gases in air | 0.46 | 0.5 | 2349 | 66 |
| percentage of gases in air | 0.97 | 0.9 | 9416 | 25 |
| gases lighter than air | 1.71 | 1 | 5001 | 5 |
| air is a mixture of gases | 1.75 | 0.8 | 4809 | 70 |
| air pollution gases | 0.73 | 1 | 877 | 69 |
| gases are in nature | 0.85 | 0.6 | 2079 | 64 |
| air pollution by exhaust gases in the usa | 1.04 | 0.3 | 1940 | 1 |
| greenhouse gases and air pollution | 1.96 | 0.6 | 3695 | 74 |
| gases that cause air pollution | 1.86 | 0.4 | 2463 | 81 |
| greenhouse gases air pollution | 0.42 | 1 | 1360 | 31 |
| indoor air pollution gases | 0.59 | 0.8 | 6880 | 71 |
| air pollution vs greenhouse gases | 0.57 | 0.3 | 8429 | 2 |
