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: Certain groups are especially vulnerable to the effects of air pollution, such as: infants, older adults and people with lung diseases like asthma.
