| SERIOUS |
| Coachella Valley, CA |
| East Kern Co, CA |
| Imperial Valley, CA |
| Owens Valley, CA |
| Phoenix, AZ |
| |
| MODERATE |
| Ajo (Pima County), AZ |
| Anthony, NM |
| Butte, MT |
| Columbia Falls, MT |
| El Paso Co, TX |
| Flathead County; Whitefish and vicinity, MT |
| Fort Hall Indian Reservation |
| Hayden, AZ |
| Kalispell, MT |
| Lame Deer, MT |
| Lane Co, OR |
| Libby, MT |
| Miami, AZ |
| Missoula, MT |
| Mono Basin, CA |
| New York Co, NY |
| Nogales, AZ |
| Ogden, UT |
| Paul Spur/Douglas (Cochise County), AZ |
| Pinehurst, ID |
| Polson, MT |
| Rillito, AZ |
| Ronan, MT |
| Salt Lake Co, UT |
| San Bernardino Co, CA |
| Sanders County (part); Thompson Falls and vicinity, MT |
| Sheridan, WY |
| Shoshone Co, ID |
| Trona, CA |
| Utah Co, UT |
| West Pinal, AZ |
| Yuma, AZ |
