| CBSA | Year | Good | Mod | Unhealthy | v.unhealthy | O3 | SO2 | PM2.5 | PM10 | aqi |
| Adjuntas, PR | 2021 | 53 | 4 | 0 | 0 | 0 | 0 | 57 | 0 | 58 |
| Adrian, MI | 2021 | 296 | 68 | 2 | 0 | 199 | 0 | 167 | 0 | 122 |
| Akron, OH | 2021 | 275 | 86 | 4 | 0 | 141 | 4 | 220 | 0 | 114 |
| Albany, GA | 2021 | 276 | 87 | 2 | 0 | 0 | 0 | 365 | 0 | 114 |
| Albany-Schenectady-Troy, NY | 2021 | 306 | 57 | 3 | 0 | 197 | 1 | 168 | 0 | 143 |
| Albuquerque, NM | 2021 | 131 | 225 | 9 | 1 | 202 | 0 | 81 | 83 | 214 |
| Alexandria, LA | 2021 | 111 | 9 | 1 | 0 | 0 | 0 | 121 | 0 | 103 |
| Allentown-Bethlehem-Easton, PA-NJ | 2021 | 299 | 66 | 1 | 0 | 217 | 0 | 143 | 0 | 117 |
| Altoona, PA | 2021 | 310 | 51 | 0 | 0 | 229 | 1 | 131 | 0 | 87 |
| Amarillo, TX | 2021 | 245 | 107 | 14 | 0 | 288 | 57 | 21 | 0 | 138 |
| Americus, GA | 2021 | 237 | 3 | 0 | 0 | 240 | 0 | 0 | 0 | 64 |
| Anchorage, AK | 2021 | 326 | 39 | 1 | 0 | 0 | 0 | 247 | 115 | 103 |