| 100% | EPA | 3 | Federal organization concerned with air quality: Abbr. |
| 83% | EPA | 3 | Organization concerned with air quality: Abbr. |
| 75% | EPA | 3 | Federal department concerned with air quality (Abbr.) |
| 68% | EPA | 3 | Government group concerned with air quality: Abbr. |
| 68% | EPA | 3 | Government agency concerned with air quality: Abbr. |
| 68% | TSA | 3 | Organization concerned with air-travel safety: Abbr. |
| 67% | EPA | 3 | Federal organization concerned with acid rain: Abbr. |
| 67% | EPA | 3 | Federal organization concerned with clean water: Abbr. |
| 67% | EPA | 3 | Federal organization concerned with greenhouse gases: Abbr. |
| 67% | EPA | 3 | Group concerned with air quality: Abbr. |
| 67% | EPA | 3 | Federal organization concerned with pollution: Abbr. |
| 65% | EPA | 3 | Federal dept. concerned with air quality |
| 64% | EPA | 3 | Organization concerned with clean air: Abbr. |
| 63% | EPA | 3 | Organization concerned with clean air and water: Abbr. |
| 62% | EPA | 3 | Government group concerned with air quality (Abbr.) |
| 62% | EPA | 3 | Govt. group concerned with air quality (Abbr.) |
| 62% | EPA | 3 | Agency concerned with air quality (Abbr.) |
| 58% | EPA | 3 | Government group concerned with the air quality index: Abbr. |
| 57% | EPA | 3 | Federal group concerned with clean air (Abbr.) |
| 55% | EPA | 3 | Org. concerned with air quality |
| 54% | ACLU | 4 | Organization concerned with freedom of speech: Abbr. |
| 54% | ADA | 3 | Organization concerned with smiles?: Abbr. |
| 54% | USDA | 4 | Federal organization concerning farmers: Abbr. |
| 53% | ADA | 3 | Organization concerned with toothaches: Abbr. |
| 53% | EPA | 3 | Organization concerned with emissions: Abbr. |
| 53% | EPA | 3 | Organization concerned with ecology: Abbr. |
| 53% | NEA | 3 | Organization concerned with pedagogy: Abbr. |
| 52% | ACLU | 4 | Organization concerned with human rights: Abbr. |
| 52% | ADA | 3 | Organization concerned with tooth care: Abbr. |
| 52% | EPA | 3 | Organization concerned with global warming: Abbr. |