| 100% | EPA | 3 | Organization concerned with air quality: Abbr. |
| 96% | EPA | 3 | Federal organization concerned with air quality: Abbr. |
| 80% | EPA | 3 | Group concerned with air quality: Abbr. |
| 77% | EPA | 3 | Government group concerned with air quality: Abbr. |
| 77% | TSA | 3 | Organization concerned with air-travel safety: Abbr. |
| 77% | EPA | 3 | Government agency concerned with air quality: Abbr. |
| 77% | EPA | 3 | Organization concerned with clean air: Abbr. |
| 73% | EPA | 3 | Organization concerned with clean air and water: Abbr. |
| 73% | EPA | 3 | Agency concerned with air quality (Abbr.) |
| 71% | EPA | 3 | Federal department concerned with air quality (Abbr.) |
| 71% | EPA | 3 | Government group concerned with air quality (Abbr.) |
| 71% | EPA | 3 | Govt. group concerned with air quality (Abbr.) |
| 68% | EPA | 3 | Government group concerned with the air quality index: Abbr. |
| 64% | EPA | 3 | Org. concerned with air quality |
| 63% | EPA | 3 | Federal dept. concerned with air quality |
| 62% | ACLU | 4 | Organization concerned with human rights: Abbr. |
| 62% | ADA | 3 | Organization concerned with tooth care: Abbr. |
| 62% | EPA | 3 | Organization concerned with global warming: Abbr. |
| 62% | IRS | 3 | Organization concerned with tax returns: Abbr. |
| 62% | ADA | 3 | Organization concerned with oral health: Abbr. |
| 62% | CIA | 3 | Organization concerned with foreign spies: Abbr. |
| 62% | AMA | 3 | Organization concerned with public health: Abbr. |
| 62% | OSHA | 4 | Organization concerned with workplace accidents: Abbr. |
| 62% | ADA | 3 | Organization concerned with oral hygiene: Abbr. |
| 62% | EPA | 3 | Organization concerned with clean energy: Abbr. |
| 62% | APA | 3 | Organization concerned with mental health: Abbr. |
| 62% | ADA | 3 | Organization concerned with preventing cavities: Abbr. |
| 62% | NSA | 3 | Organization concerned with cyber warfare: Abbr. |
| 62% | ADA | 3 | Organization concerned with smiles?: Abbr. |
| 61% | ADA | 3 | Organization concerned with toothaches: Abbr. |