| 100% | SMOG | 4 | Air problem that traffic emissions contribute to |
| 49% | SMOG | 4 | Pollution that car emissions contribute to |
| 38% | HAZE | 4 | Air problem related to smog |
| 37% | LICE | 4 | Problems that come to a head? |
| 34% | CONUNDRUM | 9 | A riddle or problem that's difficult to solve |
| 34% | REDLIGHT | 8 | Traffic symbol that instructs vehicles to stop |
| 33% | TRANE | 5 | Air conditioner brand that's "hard to stop" |
| 33% | FAA | 3 | Org. that oversees air traffic (Abbr.) |
| 33% | FAA | 3 | Organization that manages air traffic: Abbr. |
| 33% | BSIDE | 5 | Fare that was rare to air |
| 33% | AERATORS | 8 | Devices that add air to water |
| 33% | AMNESIA | 7 | Problem that crossword constructors can't afford to have, if I remember rightly |
| 33% | MARIA | 5 | She's a problem that needs to be solved, in song |
| 33% | SMOG | 4 | Air pollution that's a major problem in China |
| 33% | RAID | 4 | Air ___ shelter (structure that's similar to a bunker) |
| 33% | ETD | 3 | Guesstimate that depends on air traffic: Abbr. |
| 33% | FAA | 3 | Agency that oversees air traffic controllers: Abbr. |
| 32% | MTV | 3 | Channel that used to air "Total Request Live" |
| 32% | BRONCHI | 7 | Respiratory tracts that send air to the lungs |
| 32% | CSI | 3 | CBS procedural that aired from 2000 to 2015 |
| 32% | COAL | 4 | Fuel that contributes to global warming |
| 31% | VWS | 3 | Vehicles that were designed to cheat on emissions tests |
| 31% | LINK | 4 | Missing ___ (something that's needed to resolve a problem) |
| 31% | GREATSMOG | 9 | London pollution event that led to clean air acts |
| 31% | GUAM | 4 | Island that’s home to Andersen Air Force Base |
| 31% | ABC | 3 | Network that airs "How to Get Away With Murder" |
| 31% | TLC | 3 | Network that airs "Sex Sent Me to the ER" |
| 31% | MUSTY | 5 | Like a basement that needs to be aired out |
| 31% | SMOG | 4 | Pollution that smokestacks contribute to |
| 31% | ENID | 4 | Oklahoma city that's home to Vance Air Force Base |