| 100% | SMOG | 4 | Pollution that affects the Air Quality Index |
| 69% | SMOG | 4 | Pollution that factors in the Air Quality Index |
| 51% | EPA | 3 | Government group concerned with the air quality index: Abbr. |
| 42% | TBS | 3 | Cable channel that airs the game show "The Misery Index" |
| 41% | SMOG | 4 | Air Quality Index factor |
| 41% | EPA | 3 | Air Quality Index org. |
| 39% | ARTHRITIS | 9 | Disease that affects the joints |
| 38% | DIABETES | 8 | Disorders that affect the production of insulin |
| 38% | DENTISTRY | 9 | Treatment of diseases that affect the teeth |
| 37% | AIR | 3 | ___ quality index (atmospheric pollution measure) |
| 37% | SMOG | 4 | Pollution that may sting the eyes |
| 37% | DISAPPEARINGACT | 15 | Magic trick that affects the answers to starred clues |
| 36% | TBS | 3 | Cable channel that airs "The Cube" and "The Misery Index" |
| 36% | SEO | 3 | Process that affects the visibility of a website, say: Abbr. |
| 36% | EPA | 3 | Air quality watchdog created by the Nixon admin. |
| 36% | SMOG | 4 | Pollution that often obscures the L.A. skyline |
| 36% | ACIDRAIN | 8 | Pollution that falls from the sky in drops |
| 36% | SAPOR | 5 | Quality that affects taste |
| 36% | SAPORS | 6 | Qualities that affect taste |
| 35% | SMOG | 4 | Pollution that can change the colors of a sunset |
| 35% | AQUARIUS | 8 | The air zodiac that is neither Gemini nor Libra |
| 35% | APNEA | 5 | Sleep ___ (affliction that affects quality of sleep) |
| 35% | ACIDRAIN | 8 | Corrosive pollution that falls from the sky |
| 35% | SMOG | 4 | Air pollution that limits visibility |
| 35% | SMOG | 4 | Urban pollution that may spoil the city skyline |
| 35% | NIP | 3 | ___ in the air (weather that's turned colder) |
| 35% | SMOG | 4 | Air pollution that obscures a skyline |
| 34% | SMOG | 4 | Pollution in the air |
| 34% | SMOG | 4 | Air pollution that's bad in Beijing |
| 34% | FINGER | 6 | Index __, the one that points at others |