Grade B Air Quality Cities

490 cities with good air quality

Grade B means good air quality with occasional moderate pollution days. These cities are scored using EPA Air Quality System data spanning 10 years of daily AQI readings.

490

Cities

Avg AQI (5yr)

254

Improving

Worsening

A B C D F

All Grade B Cities

City	State	5yr Avg AQI	Trend	Worst Pollutant
Mohave, Arizona	AZ	17	Stable	PM10
Pitkin, Colorado	CO	13	Stable	PM10
Wasco, Oregon	OR	24	Improving	PM2.5
Aleutians East, Alaska	AK	12	Stable	PM2.5
Athens, Ohio	OH	30	Improving	PM2.5
Charlton, Georgia	GA	26	Improving	PM2.5
Cowlitz, Washington	WA	22	Improving	PM2.5
Floyd, Georgia	GA	43	Improving	PM2.5
Guayama, Puerto Rico	PR	24	Improving	PM2.5
Howard, Maryland	MD	37	Improving	PM2.5
Hyde, North Carolina	NC	23	Improving	PM2.5
Jerome, Idaho	ID	17	Improving	PM2.5
Kenai Peninsula, Alaska	AK	10	Stable	PM2.5
Lubbock, Texas	TX	28	Improving	PM2.5
Martin, North Carolina	NC	35	Improving	Ozone
Mitchell, North Carolina	NC	30	Improving	PM2.5
Napa, California	CA	39	Improving	PM2.5
Orleans, Louisiana	LA	36	Improving	PM2.5
Ravalli, Montana	MT	22	Improving	PM2.5
Roosevelt, Montana	MT	14	Stable	PM2.5
San Juan, Colorado	CO	9	Stable	PM2.5
Scotts Bluff, Nebraska	NE	24	Improving	PM2.5
Skagit, Washington	WA	28	Improving	PM2.5
Socorro, New Mexico	NM	15	Stable	PM2.5
Bay, Michigan	MI	32	Improving	PM2.5
Catron, New Mexico	NM	13	Stable	PM2.5
Jefferson, Washington	WA	22	Improving	PM2.5
Keweenaw, Michigan	MI	13	Stable	PM2.5
Lake, Montana	MT	10	Stable	PM2.5
Lincoln, New Mexico	NM	14	Stable	PM2.5
Marion, West Virginia	WV	38	Improving	PM2.5
Mercer, Pennsylvania	PA	42	Improving	Ozone
Monroe, Pennsylvania	PA	35	Improving	Ozone
Montgomery, Tennessee	TN	35	Improving	PM2.5
Pike, Kentucky	KY	39	Improving	PM2.5
Sherman, Kansas	KS	16	Stable	PM10
Silver Bow, Montana	MT	27	Improving	PM2.5
Wayne, Utah	UT	11	Stable	PM2.5
Winona, Minnesota	MN	23	Improving	PM2.5
Adams, Washington	WA	18	Improving	PM2.5
Allen, Indiana	IN	42	Improving	PM2.5
Caswell, North Carolina	NC	37	Improving	Ozone
Honolulu, Hawaii	HI	29	Improving	Ozone
Los Alamos, New Mexico	NM	13	Stable	PM2.5
Lynchburg City, Virginia	VA	31	Improving	PM2.5
Marin, California	CA	36	Improving	PM2.5
Mason, Washington	WA	24	Improving	PM2.5
Powell, Montana	MT	11	Stable	PM2.5
Putnam, Florida	FL	16	Worsening	PM10
Salem City, Virginia	VA	34	Improving	PM2.5
Thomas, Nebraska	NE	17	Stable	PM2.5
Thurston, Washington	WA	27	Improving	PM2.5
Twin Falls, Idaho	ID	27	Improving	PM2.5
Union, Oregon	OR	27	Improving	PM2.5
Androscoggin, Maine	ME	34	Improving	PM2.5
Brooke, West Virginia	WV	19	Stable	PM10
Carroll, Indiana	IN	34	Improving	Ozone
Cerro Gordo, Iowa	IA	18	Worsening	PM10
Clermont, Ohio	OH	42	Improving	PM2.5
Cobb, Georgia	GA	41	Improving	Ozone
Fayette, Texas	TX	34	Improving	PM2.5
Franklin, Idaho	ID	25	Improving	PM2.5
Grays Harbor, Washington	WA	25	Improving	PM2.5
Lawrence, Alabama	AL	29	Improving	PM2.5
Lawrence, Tennessee	TN	33	Improving	PM2.5
Lewis, Washington	WA	25	Improving	PM2.5
Maury, Tennessee	TN	33	Improving	PM2.5
Maverick, Texas	TX	35	Improving	PM2.5
Oneida, New York	NY	25	Improving	PM2.5
Orange, Florida	FL	38	Improving	Ozone
Platte, Wyoming	WY	16	Stable	PM10
Posey, Indiana	IN	34	Improving	Ozone
Prowers, Colorado	CO	17	Stable	PM10
Putnam, Tennessee	TN	34	Improving	PM2.5
Sheridan, Montana	MT	16	Stable	PM2.5
Westmoreland, Pennsylvania	PA	42	Improving	PM2.5
Aroostook, Maine	ME	36	Improving	PM2.5
Boone, Indiana	IN	35	Improving	Ozone
Bristol City, Virginia	VA	35	Improving	PM2.5
Brown, South Dakota	SD	26	Improving	PM2.5
Bucks, Pennsylvania	PA	37	Improving	Ozone
Clay, Alabama	AL	37	Improving	PM2.5
Deschutes, Oregon	OR	25	Improving	PM2.5
Erie, Pennsylvania	PA	39	Improving	PM2.5
Ford, Kansas	KS	15	Worsening	PM10
Harrison, West Virginia	WV	37	Improving	PM2.5
Herkimer, New York	NY	29	Improving	Ozone
Huntington, Indiana	IN	31	Improving	Ozone
Oconee, South Carolina	SC	37	Improving	Ozone
Park, Wyoming	WY	20	Stable	PM2.5
Penobscot, Maine	ME	33	Improving	PM2.5
Perry, Indiana	IN	36	Improving	Ozone
Prince George's, Maryland	MD	42	Improving	Ozone
Sarpy, Nebraska	NE	38	Improving	PM2.5
Stoddard, Missouri	MO	31	Improving	PM2.5
Suffolk, Massachusetts	MA	44	Improving	PM2.5
Warrick, Indiana	IN	36	Improving	Ozone
Washington, Minnesota	MN	37	Improving	Ozone
Washington, Nebraska	NE	31	Improving	PM2.5
Belmont, Ohio	OH	18	Worsening	NO2
Box Elder, Utah	UT	39	Improving	Ozone
Chase, Kansas	KS	26	Stable	PM2.5
Chaves, New Mexico	NM	24	Stable	PM2.5
Clark, Illinois	IL	34	Improving	Ozone
Columbia, Georgia	GA	35	Improving	Ozone
Ellis, Texas	TX	41	Improving	PM2.5
Franklin, Washington	WA	22	Stable	PM2.5
Garfield, Utah	UT	36	Improving	Ozone
Klickitat, Washington	WA	22	Stable	PM2.5
Lake, California	CA	32	Improving	Ozone
Macoupin, Illinois	IL	33	Improving	Ozone
Nassau, New York	NY	30	Improving	PM2.5
Northampton, North Carolina	NC	35	Improving	PM2.5
Rockingham, New Hampshire	NH	40	Improving	Ozone
Shelby, Indiana	IN	35	Improving	Ozone
Stafford, Virginia	VA	36	Improving	Ozone
Whatcom, Washington	WA	29	Improving	PM2.5
Brown, Indiana	IN	35	Improving	Ozone
Carlton, Minnesota	MN	29	Stable	Ozone
Chesterfield, South Carolina	SC	39	Improving	PM2.5
Clearfield, Pennsylvania	PA	33	Improving	Ozone
Coffee, Georgia	GA	36	Improving	PM2.5
Ector, Texas	TX	36	Improving	PM2.5
Elkhart, Indiana	IN	43	Improving	PM2.5
Greene, Ohio	OH	41	Improving	PM2.5
Kent, Maryland	MD	40	Improving	Ozone
Kootenai, Idaho	ID	30	Improving	PM2.5
Northampton, Pennsylvania	PA	44	Improving	PM2.5
Orange, New York	NY	37	Improving	Ozone
Potter, Texas	TX	28	Stable	PM2.5
Rockwall, Texas	TX	33	Improving	Ozone
San Mateo, California	CA	36	Improving	PM2.5
Whitman, Washington	WA	23	Stable	PM2.5
Aiken, South Carolina	SC	36	Improving	Ozone
Amador, California	CA	37	Improving	Ozone
Ascension, Louisiana	LA	32	Stable	Ozone
Baltimore (City), Maryland	MD	43	Improving	PM2.5
Benton, Oregon	OR	22	Stable	PM2.5
Bonneville, Idaho	ID	30	Improving	PM2.5
Calvert, Maryland	MD	39	Improving	Ozone
Chester, Pennsylvania	PA	45	Improving	PM2.5
Clinton, Michigan	MI	36	Improving	Ozone
Darlington, South Carolina	SC	36	Improving	Ozone
Garrett, Maryland	MD	39	Improving	Ozone
Grafton, New Hampshire	NH	36	Improving	Ozone
Greenbrier, West Virginia	WV	37	Improving	Ozone
Hardin, Kentucky	KY	44	Improving	PM2.5
Hartford, Connecticut	CT	42	Improving	PM2.5
Hendricks, Indiana	IN	34	Improving	Ozone
Howard, Indiana	IN	44	Improving	PM2.5
Indian River, Florida	FL	35	Improving	Ozone
Jackson, Colorado	CO	21	Worsening	PM2.5
Lackawanna, Pennsylvania	PA	41	Improving	PM2.5
Lexington, South Carolina	SC	42	Improving	PM2.5
Macon, North Carolina	NC	31	Stable	Ozone
Manatee, Florida	FL	34	Stable	Ozone
Nassau, Florida	FL	42	Improving	PM2.5
Niagara, New York	NY	34	Improving	Ozone
Nye, Nevada	NV	20	Worsening	PM10
Ohio, West Virginia	WV	40	Improving	Ozone
Rapides, Louisiana	LA	39	Improving	PM2.5
Rockbridge, Virginia	VA	35	Improving	Ozone
Saratoga, New York	NY	32	Stable	Ozone
Sonoma, California	CA	36	Improving	Ozone
St. James, Louisiana	LA	30	Stable	Ozone
St. Martin, Louisiana	LA	34	Improving	Ozone
Sumter, Alabama	AL	36	Improving	PM2.5
Susquehanna, Pennsylvania	PA	32	Improving	PM2.5
Victoria, Texas	TX	31	Stable	Ozone
Alexander, North Carolina	NC	38	Improving	Ozone
Anne Arundel, Maryland	MD	40	Improving	Ozone
Belknap, New Hampshire	NH	32	Stable	Ozone
Black Hawk, Iowa	IA	45	Improving	PM2.5
Campbell, Kentucky	KY	44	Improving	PM2.5
Caroline, Virginia	VA	37	Improving	Ozone
Cascade, Montana	MT	30	Improving	PM2.5
Charles, Maryland	MD	39	Improving	Ozone
Chattooga, Georgia	GA	36	Stable	Ozone
Colbert, Alabama	AL	38	Improving	Ozone
Crook, Oregon	OR	29	Improving	PM2.5
Dawson, Georgia	GA	35	Improving	Ozone
Dyer, Tennessee	TN	37	Improving	PM2.5
Edgecombe, North Carolina	NC	38	Improving	PM2.5
Elk, Pennsylvania	PA	35	Stable	Ozone
Elmore, Alabama	AL	35	Stable	Ozone
Greenup, Kentucky	KY	36	Stable	Ozone
Hall, Nebraska	NE	29	Stable	PM2.5
Houston, Alabama	AL	38	Improving	Ozone
Hudson, New Jersey	NJ	44	Improving	PM2.5
Lake, Ohio	OH	41	Improving	PM2.5
LaPorte, Indiana	IN	37	Improving	Ozone
Lenoir, North Carolina	NC	37	Improving	Ozone
Lyon, Nevada	NV	39	Improving	Ozone
Montgomery, Maryland	MD	41	Improving	PM2.5
Muscatine, Iowa	IA	44	Improving	PM2.5
New York, New York	NY	44	Improving	PM2.5
Ouachita, Louisiana	LA	36	Improving	Ozone
Ponce, Puerto Rico	PR	29	Stable	PM10
Prince Edward, Virginia	VA	33	Stable	Ozone
Richmond, New York	NY	41	Improving	PM2.5
San Francisco, California	CA	38	Improving	PM2.5
Shelby, Alabama	AL	38	Improving	Ozone
Somerset, Pennsylvania	PA	35	Stable	Ozone
St. John the Baptist, Louisiana	LA	33	Stable	Ozone
Tioga, Pennsylvania	PA	39	Improving	Ozone
Tucker, West Virginia	WV	35	Stable	Ozone
Warren, Ohio	OH	45	Improving	PM2.5
Washington, Maryland	MD	42	Improving	PM2.5
Westchester, New York	NY	38	Improving	Ozone
Williams, North Dakota	ND	34	Stable	Ozone
Wood, West Virginia	WV	39	Improving	Ozone
Arkansas, Arkansas	AR	40	Improving	PM2.5
Arlington, Virginia	VA	37	Improving	Ozone
Armstrong, Pennsylvania	PA	45	Improving	PM2.5
Atlantic, New Jersey	NJ	38	Improving	Ozone
Avery, North Carolina	NC	39	Stable	Ozone
Benzie, Michigan	MI	36	Improving	Ozone
Berkeley, West Virginia	WV	40	Improving	Ozone
Blair, Pennsylvania	PA	44	Improving	PM2.5
Buncombe, North Carolina	NC	40	Improving	PM2.5
Cass, Missouri	MO	41	Improving	PM2.5
Cecil, Maryland	MD	42	Improving	PM2.5
Cheshire, New Hampshire	NH	38	Improving	PM2.5
Chesterfield, Virginia	VA	38	Stable	Ozone
Claiborne, Tennessee	TN	35	Stable	Ozone
Clallam, Washington	WA	37	Improving	PM2.5
Clark, Arkansas	AR	33	Stable	Ozone
Clayton, Georgia	GA	45	Improving	PM2.5
Columbia, Oregon	OR	29	Stable	PM2.5
Cumberland, Pennsylvania	PA	46	Improving	PM2.5
Delaware, Indiana	IN	37	Stable	Ozone
Denali, Alaska	AK	34	Stable	Ozone
Dubois, Indiana	IN	43	Improving	PM2.5
Edmonson, Kentucky	KY	38	Stable	Ozone
Etowah, Alabama	AL	43	Improving	PM2.5
Fayette, Ohio	OH	36	Stable	Ozone
Flagler, Florida	FL	33	Stable	Ozone
Greene, Indiana	IN	39	Improving	Ozone
Hamilton, New York	NY	34	Stable	Ozone
Hanover, Virginia	VA	38	Stable	Ozone
Harrison, Ohio	OH	10	Worsening	CO
Jefferson, New York	NY	33	Stable	Ozone
Jefferson, Tennessee	TN	41	Improving	Ozone
Kent, Rhode Island	RI	35	Stable	Ozone
Knox, Maine	ME	34	Stable	Ozone
Lawrence, Pennsylvania	PA	33	Stable	Ozone
Lebanon, Pennsylvania	PA	46	Improving	PM2.5
Lemhi, Idaho	ID	40	Improving	PM2.5
Liberty, Florida	FL	32	Stable	Ozone
Litchfield, Connecticut	CT	38	Improving	Ozone
McMinn, Tennessee	TN	39	Improving	PM2.5
Morgan, Kentucky	KY	35	Stable	Ozone
Morris, New Jersey	NJ	36	Stable	Ozone
Polk, Arkansas	AR	38	Stable	Ozone
Rockland, New York	NY	38	Improving	Ozone
Solano, California	CA	45	Improving	PM2.5
Spencer, Indiana	IN	42	Improving	PM2.5
St. Lucie, Florida	FL	34	Stable	Ozone
Sumter, Georgia	GA	36	Stable	Ozone
Union, North Carolina	NC	40	Improving	Ozone
Van Buren, Iowa	IA	43	Improving	PM2.5
Virginia Beach City, Virginia	VA	35	Stable	PM2.5
Wayne, New York	NY	34	Stable	Ozone
York, Maine	ME	37	Improving	Ozone
Adams, Ohio	OH	34	Stable	PM2.5
Berkshire, Massachusetts	MA	42	Improving	PM2.5
Big Horn, Wyoming	WY	38	Stable	Ozone
Buchanan, Missouri	MO	44	Improving	PM2.5
Cabell, West Virginia	WV	40	Stable	Ozone
Calaveras, California	CA	44	Improving	Ozone
Caldwell, North Carolina	NC	39	Stable	Ozone
Carter, Kentucky	KY	37	Stable	Ozone
Carteret, North Carolina	NC	36	Stable	Ozone
Cass, Michigan	MI	40	Improving	Ozone
Catawba, North Carolina	NC	44	Improving	PM2.5
Chautauqua, New York	NY	37	Stable	Ozone
Clark, Washington	WA	34	Stable	PM2.5
DeKalb, Tennessee	TN	35	Stable	Ozone
Delaware, Ohio	OH	39	Stable	Ozone
Dorchester, Maryland	MD	41	Improving	Ozone
Dutchess, New York	NY	34	Stable	Ozone
Fauquier, Virginia	VA	35	Stable	Ozone
Florence, South Carolina	SC	42	Improving	PM2.5
Giles, Virginia	VA	38	Stable	Ozone
Grant, Washington	WA	26	Stable	PM2.5
Granville, North Carolina	NC	41	Stable	Ozone
Gregg, Texas	TX	34	Stable	Ozone
Henry, Indiana	IN	38	Improving	PM2.5
Hillsborough, New Hampshire	NH	38	Stable	Ozone
Huron, Michigan	MI	37	Stable	Ozone
Iron, Utah	UT	42	Improving	Ozone
Lake, Florida	FL	35	Stable	Ozone
Lauderdale, Mississippi	MS	34	Stable	Ozone
Lee, Florida	FL	39	Improving	PM2.5
Licking, Ohio	OH	40	Stable	Ozone
Loudon, Tennessee	TN	41	Improving	PM2.5
Loudoun, Virginia	VA	37	Stable	Ozone
Luzerne, Pennsylvania	PA	34	Stable	Ozone
Madison, Tennessee	TN	38	Stable	PM2.5
Madison, Virginia	VA	40	Improving	Ozone
Miami-Dade, Florida	FL	45	Improving	PM2.5
Monongalia, West Virginia	WV	40	Stable	Ozone
Montgomery, Iowa	IA	41	Improving	PM2.5
Noble, Ohio	OH	37	Stable	Ozone
Oakland, Michigan	MI	39	Improving	Ozone
Oswego, New York	NY	33	Stable	Ozone
Pike, Georgia	GA	36	Stable	Ozone
Pitt, North Carolina	NC	39	Improving	PM2.5
Polk, Texas	TX	32	Stable	Ozone
Putnam, New York	NY	34	Stable	Ozone
Richland, South Carolina	SC	43	Improving	PM2.5
Rockingham, Virginia	VA	36	Stable	Ozone
St. Tammany, Louisiana	LA	40	Improving	PM2.5
Suffolk City, Virginia	VA	38	Stable	Ozone
Taos, New Mexico	NM	23	Worsening	PM2.5
Tippecanoe, Indiana	IN	43	Improving	PM2.5
Tompkins, New York	NY	35	Stable	Ozone
Tuolumne, California	CA	41	Improving	Ozone
Tuscola, Michigan	MI	33	Stable	Ozone
Wexford, Michigan	MI	34	Stable	Ozone
Windham, Connecticut	CT	35	Stable	Ozone
Wood, Ohio	OH	38	Stable	Ozone
Wythe, Virginia	VA	39	Stable	Ozone
Yellowstone, Montana	MT	33	Stable	PM2.5
Anderson, Tennessee	TN	39	Stable	Ozone
Ashley, Arkansas	AR	41	Improving	PM2.5
Ashtabula, Ohio	OH	39	Stable	Ozone
Baker, Oregon	OR	31	Stable	PM2.5
Bennington, Vermont	VT	37	Stable	Ozone
Berkeley, South Carolina	SC	34	Stable	Ozone
Berks, Pennsylvania	PA	46	Improving	PM2.5
Berrien, Michigan	MI	40	Improving	Ozone
Caddo, Louisiana	LA	38	Stable	Ozone
Centre, Pennsylvania	PA	44	Improving	PM2.5
Charles, Virginia	VA	35	Stable	Ozone
Churchill, Nevada	NV	41	Improving	Ozone
Clackamas, Oregon	OR	32	Stable	PM2.5
Clinton, Ohio	OH	41	Stable	Ozone
Coos, New Hampshire	NH	42	Stable	Ozone
Cumberland, Maine	ME	40	Improving	PM2.5
Davidson, North Carolina	NC	46	Improving	PM2.5
Douglas, Georgia	GA	38	Stable	Ozone
Erie, New York	NY	44	Improving	PM2.5
Fond du Lac, Wisconsin	WI	38	Stable	Ozone
Geauga, Ohio	OH	41	Stable	Ozone
Gilmer, West Virginia	WV	32	Worsening	Ozone
Hampshire, Massachusetts	MA	39	Stable	Ozone
Hancock, Maine	ME	37	Stable	Ozone
Hancock, West Virginia	WV	37	Stable	Ozone
Henry, Georgia	GA	40	Improving	PM2.5
Highlands, Florida	FL	34	Stable	Ozone
Hunt, Texas	TX	35	Stable	Ozone
Ingham, Michigan	MI	42	Improving	PM2.5
Jackson, Arkansas	AR	41	Stable	PM2.5
Jefferson, Missouri	MO	43	Improving	PM2.5
Jefferson, Ohio	OH	50	Improving	PM2.5
Jo Daviess, Illinois	IL	34	Stable	Ozone
Kay, Oklahoma	OK	48	Improving	PM2.5
Kennebec, Maine	ME	33	Worsening	Ozone
Kitsap, Washington	WA	25	Worsening	PM2.5
Knox, Ohio	OH	40	Stable	Ozone
Lafayette, Louisiana	LA	45	Improving	PM2.5
Lake, Oregon	OR	27	Stable	PM2.5
Lancaster, Nebraska	NE	37	Stable	Ozone
Lawrence, Ohio	OH	44	Improving	PM2.5
Lincoln, North Carolina	NC	41	Stable	Ozone
Madison, Ohio	OH	41	Stable	Ozone
Marathon, Wisconsin	WI	35	Stable	Ozone
Mason, Michigan	MI	37	Stable	Ozone
Medina, Ohio	OH	42	Improving	PM2.5
Miami, Ohio	OH	40	Stable	Ozone
Monmouth, New Jersey	NJ	37	Stable	Ozone
Monroe, Missouri	MO	34	Stable	Ozone
Murray, Georgia	GA	39	Stable	Ozone
Norfolk, Massachusetts	MA	37	Stable	Ozone
Osceola, Florida	FL	34	Stable	Ozone
Oxford, Maine	ME	35	Stable	PM2.5
Palo Alto, Iowa	IA	43	Improving	PM2.5
Pasco, Florida	FL	36	Stable	Ozone
Passaic, New Jersey	NJ	39	Stable	Ozone
Pointe Coupee, Louisiana	LA	33	Stable	Ozone
Polk, Florida	FL	43	Improving	PM2.5
Pueblo, Colorado	CO	27	Worsening	PM2.5
Rockingham, North Carolina	NC	41	Stable	Ozone
Saint Louis, Missouri	MO	45	Improving	PM2.5
Santa Barbara, California	CA	46	Improving	PM2.5
Swain, North Carolina	NC	41	Improving	PM2.5
Trigg, Kentucky	KY	36	Stable	Ozone
Union, South Dakota	SD	40	Stable	Ozone
Wabash, Indiana	IN	36	Stable	Ozone
Wake, North Carolina	NC	48	Improving	PM2.5
Walla Walla, Washington	WA	25	Worsening	PM2.5
Wallowa, Oregon	OR	27	Stable	PM2.5
Washington, Kentucky	KY	37	Stable	Ozone
Washington, Maine	ME	34	Stable	Ozone
Washington, Ohio	OH	40	Stable	Ozone
Washington, Pennsylvania	PA	50	Improving	PM2.5
Washington, Rhode Island	RI	37	Stable	Ozone
Wilson, Tennessee	TN	38	Stable	Ozone
Yalobusha, Mississippi	MS	33	Stable	Ozone
Baldwin, Alabama	AL	39	Stable	Ozone
Barnstable, Massachusetts	MA	36	Stable	Ozone
Bartholomew, Indiana	IN	43	Improving	PM2.5
Beltrami, Minnesota	MN	27	Worsening	PM2.5
Boone, Missouri	MO	38	Stable	Ozone
Boyd, Kentucky	KY	44	Improving	PM2.5
Clay, Missouri	MO	41	Improving	Ozone
East Baton Rouge, Louisiana	LA	48	Improving	PM2.5
Gallatin, Montana	MT	32	Stable	PM2.5
Genesee, Michigan	MI	42	Improving	PM2.5
Hancock, Kentucky	KY	40	Stable	Ozone
Harford, Maryland	MD	44	Improving	PM2.5
Jessamine, Kentucky	KY	40	Stable	Ozone
Kittitas, Washington	WA	28	Worsening	PM2.5
Latah, Idaho	ID	18	Worsening	PM2.5
Leavenworth, Kansas	KS	35	Stable	Ozone
Lee, Iowa	IA	42	Stable	PM2.5
Lorain, Ohio	OH	39	Stable	PM2.5
Manistee, Michigan	MI	36	Stable	Ozone
Mayes, Oklahoma	OK	37	Stable	Ozone
Mesa, Colorado	CO	45	Improving	Ozone
Minnehaha, South Dakota	SD	39	Improving	Ozone
Muskegon, Michigan	MI	39	Stable	Ozone
Newton, Arkansas	AR	37	Stable	Ozone
Okaloosa, Florida	FL	36	Stable	Ozone
Palm Beach, Florida	FL	42	Stable	PM2.5
Perry, Kentucky	KY	44	Improving	PM2.5
Person, North Carolina	NC	40	Stable	Ozone
Providence, Rhode Island	RI	45	Improving	PM2.5
Ramsey, Minnesota	MN	41	Improving	PM2.5
Rio Arriba, New Mexico	NM	43	Stable	Ozone
Rutland, Vermont	VT	39	Stable	PM2.5
Sainte Genevieve, Missouri	MO	40	Stable	Ozone
Santa Cruz, California	CA	37	Stable	PM2.5
Scott, Iowa	IA	52	Improving	PM2.5
Shoshone, Idaho	ID	43	Improving	PM2.5
Sussex, Delaware	DE	43	Improving	Ozone
Vilas, Wisconsin	WI	34	Stable	Ozone
Washington, Oregon	OR	36	Stable	PM2.5
Weston, Wyoming	WY	41	Stable	Ozone
Alachua, Florida	FL	40	Stable	PM2.5
Allegan, Michigan	MI	40	Improving	Ozone
Anderson, South Carolina	SC	39	Stable	Ozone
Bristol, Massachusetts	MA	41	Stable	Ozone
Callaway, Missouri	MO	39	Stable	Ozone
Cambria, Pennsylvania	PA	48	Improving	PM2.5
Carbon, Utah	UT	44	Stable	Ozone
Carroll, Maryland	MD	42	Stable	Ozone
Clinton, Missouri	MO	40	Stable	Ozone
Cochise, Arizona	AZ	45	Stable	Ozone
Converse, Wyoming	WY	41	Stable	Ozone
Cumberland, North Carolina	NC	44	Stable	PM2.5
Douglas, Nebraska	NE	43	Improving	PM2.5
Effingham, Illinois	IL	39	Stable	Ozone
Essex, Massachusetts	MA	41	Stable	Ozone
Fajardo, Puerto Rico	PR	28	Worsening	PM2.5
Franklin, Pennsylvania	PA	36	Worsening	Ozone
Frederick, Maryland	MD	42	Stable	Ozone
Garland, Arkansas	AR	45	Stable	PM2.5
Gloucester, New Jersey	NJ	40	Stable	Ozone
Glynn, Georgia	GA	39	Stable	PM2.5
Haywood, North Carolina	NC	43	Stable	Ozone
Jackson, South Dakota	SD	39	Stable	Ozone
Kent, Delaware	DE	43	Stable	Ozone
Leon, Florida	FL	47	Improving	PM2.5
Livingston, Kentucky	KY	40	Stable	Ozone
Lowndes, Georgia	GA	46	Improving	PM2.5
Lucas, Ohio	OH	44	Improving	PM2.5
Manitowoc, Wisconsin	WI	38	Stable	Ozone
Middlesex, Connecticut	CT	40	Stable	Ozone
Multnomah, Oregon	OR	36	Stable	PM2.5
Navarro, Texas	TX	43	Stable	PM2.5
Oldham, Kentucky	KY	40	Stable	Ozone
Perry, Missouri	MO	40	Stable	Ozone
Richland, Montana	MT	38	Stable	Ozone
Roanoke, Virginia	VA	42	Stable	PM2.5
Russell, Alabama	AL	46	Improving	PM2.5
Saint Louis, Minnesota	MN	39	Stable	PM2.5
Sarasota, Florida	FL	45	Stable	PM2.5
Schoolcraft, Michigan	MI	35	Stable	PM2.5
Sevier, Tennessee	TN	43	Stable	Ozone
Simpson, Kentucky	KY	39	Stable	Ozone
Spokane, Washington	WA	41	Improving	PM2.5
Tangipahoa, Louisiana	LA	39	Stable	PM2.5
Tolland, Connecticut	CT	40	Stable	Ozone
Valencia, New Mexico	NM	43	Stable	Ozone
Webb, Texas	TX	47	Improving	PM2.5
Yavapai, Arizona	AZ	43	Stable	Ozone
Yolo, California	CA	43	Improving	Ozone
York, Pennsylvania	PA	47	Improving	PM2.5

Frequently Asked Questions

Grade B (Good) indicates good air quality with occasional moderate pollution days. The grade is based on 5-year average AQI (40%), trend direction (30%), unhealthy days per year (20%), and worst pollutant severity (10%).

490 of 1,020 monitored US cities currently have a Grade B Air Quality rating, representing 48.0% of all tracked areas.

Grade B cities generally have safe air quality for most people most of the time. However, sensitive groups should still monitor AQI on high-pollution days.

Sources: EPA Air Quality System (AQS)

Last updated: April 2026

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