All Metropolitan Statistical Areas
- Abilene, TX
- Albany, GA
- Albany-Corvallis-Lebanon, OR
- Albany-Schenectady-Amsterdam, NY
- Albuquerque, NM
- Alexandria, LA
- Allentown-Bethlehem-Easton, PA-NJ
- Altoona, PA
- Amarillo, TX
- Ames-Boone, IA
- Anchorage, AK
- Anniston-Oxford, AL
- Appleton-Oshkosh-Neenah, WI
- Asheville-Brevard, NC
- Athens-Clarke County, GA
- Atlanta-Sandy Springs-Gainesville, GA-AL
- Atlantic City-Hammonton, NJ
- Augusta-Richmond County, GA-SC
- Austin-Round Rock-Marble Falls, TX
- Bakersfield-Delano, CA
- Bangor, ME
- Barnstable Town, MA
- Baton Rouge-Pierre Part, LA
- Battle Creek, MI
- Beaumont-Port Arthur, TX
- Beckley-Oak Hill, WV
- Bellingham, WA
- Bend-Prineville, OR
- Billings, MT
- Binghamton, NY
- Birmingham-Hoover-Cullman, AL
- Bismarck, ND
- Blacksburg-Christiansburg-Radford, VA
- Bloomington, IN
- Bloomington-Normal, IL
- Boise City-Nampa, ID
- Boston-Worcester-Manchester, MA-RI-NH
- Bowling Green, KY
- Brownsville-Harlingen-Raymondville, TX
- Brunswick, GA
- Buffalo-Niagara-Cattaraugus, NY
- Burlington-South Burlington, VT
- Canton-Massillon, OH
- Cape Coral-Fort Myers, FL
- Cape Girardeau-Sikeston-Jackson, MO-IL
- Carbondale-Marion-Herrin, IL Combined Statstical Area
- Carson City, NV
- Casper, WY
- Cedar Rapids, IA
- Champaign-Urbana, IL
- Charleston, WV
- Charleston-North Charleston-Summerville, SC
- Charlotte-Gastonia-Salisbury, NC-SC
- Charlottesville, VA
- Chattanooga-Cleveland-Athens, TN-GA
- Cheyenne, WY
- Chicago-Naperville-Michigan City, IL-IN-WI
- Chico, CA
- Cincinnati-Middletown-Wilmington, OH-KY-IN
- Claremont-Lebanon, NH-VT
- Clarksville, TN-KY
- Cleveland-Akron-Elyria, OH
- Clovis-Portales, NM
- Coeur d'Alene, ID
- College Station-Bryan, TX
- Colorado Springs, CO
- Columbia, MO
- Columbia-Newberry, SC
- Columbus-Auburn-Opelika, GA-AL
- Columbus-Marion-Chillicothe, OH
- Columbus-West Point, MS
- Corbin-London, KY
- Corpus Christi-Kingsville, TX
- Cumberland, MD-WV
- Dallas-Fort Worth, TX
- Dalton, GA
- Danville, IL
- Danville, VA
- Davenport-Moline-Rock Island, IA-IL
- Dayton-Springfield-Greenville, OH
- Decatur, IL
- Denver-Aurora-Boulder, CO
- Des Moines-Newton-Pella, IA
- Detroit-Warren-Flint, MI
- Dothan-Enterprise-Ozark, AL
- Dover, DE
- Dubuque, IA
- Duluth, MN-WI
- Eau Claire-Menomonie, WI
- El Centro, CA
- El Paso, TX
- Elmira, NY
- Erie, PA
- Eugene-Springfield, OR
- Evansville, IN-KY
- Fairbanks, AK
- Fairmont-Clarksburg, WV
- Fargo-Wahpeton, ND-MN
- Farmington, NM
- Fayetteville, NC
- Fayetteville-Springdale-Rogers, AR-MO
- Findlay-Tiffin, OH
- Flagstaff, AZ
- Florence, SC
- Florence-Muscle Shoals, AL
- Fond du Lac-Beaver Dam, WI
- Fort Collins-Loveland, CO
- Fort Crestview-Fort Walton Beach-Destin, FL
- Fort Polk South-DeRidder, LA
- Fort Smith, AR-OK
- Fort Wayne-Huntington-Auburn, IN
- Fresno-Madera, CA
- Gadsden, AL
- Gainesville, FL
- Goldsboro, NC
- Grand Forks, ND-MN
- Grand Junction, CO
- Grand Rapids-Muskegon-Holland, MI
- Great Falls, MT
- Green Bay, WI
- Greensboro--Winston-Salem--High Point, NC
- Greenville, NC
- Greenville-Spartanburg-Anderson, SC
- Gulfport-Biloxi-Pascagoula, MS
- Hagerstown-Martinsburg, MD-WV
- Hanford-Corcoran, CA
- Harrisburg-Carlisle-Lebanon, PA
- Harrisonburg, VA
- Hartford-West Hartford-Willimantic, CT
- Hattiesburg, MS
- Hickory-Lenoir-Morganton, NC
- Honolulu, HI
- Hot Springs, AR
- Houma-Bayou Cane-Thibodaux, LA
- Houston-Baytown-Huntsville, TX
- Huntington-Ashland, WV-KY-OH
- Huntsville-Decatur, AL
- Idaho Falls-Blackfoot, ID
- Indianapolis-Anderson-Columbus, IN
- Iowa City, IA
- Ithaca-Cortland, NY
- Jackson, MI
- Jackson-Humboldt, TN
- Jackson-Yazoo City, MS
- Jacksonville, FL
- Jacksonville, NC
- Janesville, WI
- Jefferson City, MO
- Johnson City-Kingsport-Bristol (Tri-Cities), TN-VA
- Johnstown, PA
- Jonesboro-Paragould, AR
- Joplin, MO
- Kalamazoo-Portage, MI
- Kansas City-Overland Park-Kansas City, MO-KS
- Kennewick-Pasco-Richland, WA
- Killeen-Temple-Fort Hood, TX
- Knoxville-Sevierville-La Follette, TN
- Kokomo-Peru, IN
- La Crosse, WI-MN
- Lafayette-Acadiana, LA
- Lafayette-Frankfort, IN
- Lake Charles-Jennings, LA
- Lake Havasu City-Kingman, AZ
- Lakeland-Winter Haven, FL
- Lancaster, PA
- Lansing-East Lansing-Owosso, MI
- Laredo, TX
- Las Cruces, NM
- Las Vegas-Paradise-Pahrump, NV
- Lawrence, KS
- Lawton, OK
- Lewiston, ID-WA
- Lexington-Fayette--Frankfort--Richmond, KY
- Lima-Van Wert-Wapakoneta, OH*
- Lincoln, NE
- Little Rock-North Little Rock-Pine Bluff, AR
- Logan, UT-ID
- Longview, WA
- Longview-Marshall, TX
- Los Angeles-Long Beach-Riverside, CA
- Louisville-Jefferson County-Elizabethtown-Scottsburg, KY-IN
- Lubbock-Levelland, TX
- Lumberton-Laurinburg, NC
- Lynchburg, VA
- Macon-Warner Robins-Fort Valley, GA
- Madison-Baraboo, WI
- Manhattan, KS
- Mankato-North Mankato, MN
- Mansfield-Bucyrus, OH
- McAllen-Edinburg-Pharr, TX
- Medford, OR
- Memphis, TN-MS-AR
- Merced, CA
- Miami-Fort Lauderdale-Pompano Beach, FL
- Midland-Odessa, TX
- Milwaukee-Racine-Waukesha, WI
- Minneapolis-St. Paul-St. Cloud, MN-WI
- Missoula, MT
- Mobile-Daphne-Fairhope, AL
- Modesto, CA
- Monroe-Bastrop, LA
- Montgomery-Alexander City, AL
- Morgantown, WV
- Muncie, IN
- Myrtle Beach-Conway-Georgetown, SC
- Naples-Marco Island, FL
- Nashville-Davidson--Murfreesboro--Columbia, TN
- New Orleans-Metairie-Bogalusa, LA
- New York-Newark-Bridgeport, NY-NJ-CT-PA
- Niles-Benton Harbor, MI
- Norwich-New London, CT
- Ocala, FL
- Ocean City, NJ
- Oklahoma City-Shawnee, OK
- Omaha-Council Bluffs-Fremont, NE-IA
- Orlando-Deltona-Daytona Beach, FL
- Owensboro, KY
- Paducah-Mayfield, KY-IL
- Palm Bay-Melbourne-Titusville, FL
- Panama City-Lynn Haven-Panama City Beach, FL
- Parkersburg-Marietta, WV-OH
- Pensacola-Ferry Pass-Brent, FL
- Peoria-Canton, IL
- Philadelphia-Camden-Vineland, PA-NJ-DE-MD
- Phoenix-Mesa-Glendale, AZ
- Pittsburgh-New Castle, PA
- Pittsfield, MA
- Pocatello, ID
- Port St. Lucie-Sebastian-Vero Beach, FL
- Portland-Lewiston-South Portland, ME
- Portland-Vancouver-Hillsboro, OR-WA
- Prescott, AZ
- Provo-Orem, UT
- Pueblo, CO
- Raleigh-Durham-Cary, NC
- Rapid City, SD
- Redding, CA
- Reno-Sparks-Fernley, NV
- Richmond, VA
- Roanoke, VA
- Rochester, MN
- Rochester-Batavia-Seneca Falls, NY
- Rockford-Freeport-Rochelle, IL
- Rocky Mount, NC
- Rome, GA
- Sacramento--Arden-Arcade--Yuba City, CA-NV
- Saginaw-Bay City-Saginaw Township North, MI
- Salem, OR
- Salinas, CA
- Salisbury-Ocean Pines, MD
- Salt Lake City-Ogden-Clearfield, UT
- San Angelo, TX
- San Antonio-New Braunfels, TX
- San Diego-Carlsbad-San Marcos, CA
- San Jose-San Francisco-Oakland, CA
- San Luis Obispo-Paso Robles, CA
- Sandusky, OH
- Santa Barbara-Santa Maria-Goleta, CA
- Santa Fe-Espanola, NM
- Sarasota-Bradenton-Punta Gorda, FL
- Savannah-Hinesville-Fort Stewart, GA
- Scranton--Wilkes-Barre, PA
- Seattle-Tacoma-Olympia, WA
- Sheboygan, WI
- Shreveport-Bossier City-Minden, LA
- Sioux City-Vermillion, IA-NE-SD
- Sioux Falls, SD
- South Bend-Elkhart-Mishawaka, IN-MI
- Spokane, WA
- Springfield, IL
- Springfield, MA
- Springfield, MO
- St. George, UT
- St. Joseph, MO-KS
- St. Louis-St. Charles-Farmington, MO-IL
- State College, PA
- Steubenville-Weirton, OH-WV
- Stockton, CA
- Sumter, SC
- Sunbury-Lewisburg-Selinsgrove, PA
- Syracuse-Auburn, NY
- Tallahassee, FL
- Tampa-St. Petersburg-Clearwater, FL
- Terre Haute, IN
- Texarkana, TX-Texarkana, AR
- Toledo-Fremont, OH
- Topeka, KS
- Tucson, AZ
- Tulsa-Bartlesville, OK
- Tuscaloosa, AL
- Tyler-Jacksonville, TX
- Union City-Martin, TN-KY
- Utica-Rome, NY
- Valdosta, GA
- Victoria, TX
- Virginia Beach-Norfolk-Newport News, VA-NC
- Visalia-Porterville, CA
- Waco, TX
- Washington-Baltimore-Northern Virginia, DC-MD-VA-WV
- Waterloo-Cedar Falls, IA
FACT: Steps you can take to improve air quality will also help fight climate change. Drive less. Don’t burn wood or trash. Use less electricity. Make sure your school system requires clean buses.
