| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| describe the clean air act | 1.68 | 0.9 | 8035 | 15 |
| describe the clean air act of 1970 | 0.98 | 0.1 | 7899 | 47 |
| describe impacts of the clean air act | 1.66 | 0.9 | 8267 | 57 |
| clean air act of 1970 text | 1.83 | 0.9 | 4829 | 95 |
| the clean air act of 1990 | 0.67 | 0.1 | 4080 | 47 |
| clean air act amendments of 1970 | 1.68 | 0.5 | 5351 | 38 |
| history of the clean air act | 0.76 | 0.7 | 7026 | 58 |
| clean air act of 1972 | 0.57 | 0.5 | 7287 | 42 |
| clean air act of 1973 | 1.51 | 0.6 | 362 | 93 |
| clean air act 1970 impact | 0.32 | 0.3 | 8314 | 32 |
| what was the clean air act | 1.03 | 0.6 | 1945 | 74 |
| explain the clean air act | 1.11 | 0.4 | 737 | 30 |
| clean air act wiki | 0.71 | 0.5 | 3760 | 18 |
