Metro 4 Membership
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Metro 4 represents seventeen southeastern local (city, county, and metropolitan) air pollution control agencies located in:
- Huntsville, Alabama
- Jefferson County, Alabama (Birmingham area)
- Broward County, Florida (Fort Lauderdale area)
- Hillsborough County, Florida (Tampa area)
- Jacksonville, Florida (metro)
- Miami-Dade County, Florida (metro)
- Orange County, Florida (Orlando area)
- Palm Beach County, Florida (West Palm Beach area)
- Pinellas County, Florida (Clearwater/St. Petersburg area)
- Louisville, Kentucky (metro)
- Forsyth County, North Carolina (Winston-Salem area)
- Mecklenburg County, North Carolina (Charlotte area)
- Western North Carolina (Asheville area)
- Chattanooga-Hamilton County, Tennessee
- Knox County, Tennessee (Knoxville area)
- Nashville, Tennessee (metro)
- Shelby County, Tennessee (Memphis area)