| ysaqmd.org | Yolo/Solano Air Quality Management District |
| vcapcd.org | Ventura County Air Pollution Control District |
| valleyair.org | San Joaquin Valley Air Pollution Control District |
| slocleanair.org | Air Pollution Control District |
| san-diego.ca.us | Air Pollution Control District |
| sbcapcd.org | Santa Barbara County Air Pollution Control District |
| ca.gov | Air Pollution Control District -- Placer County, Calif. |
| shasta.ca.us | Shasta County - Air Quality Management District |
| aqmd.gov | South Coast Air Quality Management District |
| airquality.org | Sacramento Metropolitan Air Quality Management District |
United States , Texas , San Antonio