Moderate (51-100) AQI Cities

72 US cities have a 5-year average AQI in the moderate range. Air quality is acceptable. Some pollutants may be a concern for sensitive individuals.

Cities

7.1%

Of All Cities

Improving

Worsening

Good Moderate Unhealthy

All Moderate AQI Cities

City	State	5yr Avg AQI	Grade	Trend	Worst Pollutant
Maricopa, Arizona	AZ	90	F	Worsening	Ozone
Riverside, California	CA	82	D	Improving	Ozone
San Bernardino, California	CA	82	F	Improving	Ozone
BAJA CALIFORNIA NORTE, Country Of Mexico	MX	81	F	Worsening	PM2.5
Kern, California	CA	77	D	Improving	Ozone
Los Angeles, California	CA	75	D	Improving	PM2.5
Tulare, California	CA	75	D	Improving	Ozone
Fresno, California	CA	68	D	Improving	Ozone
San Diego, California	CA	67	D	Stable	PM2.5
Pinal, Arizona	AZ	66	D	Improving	PM10
Kings, California	CA	64	D	Improving	Ozone
Clark, Nevada	NV	62	D	Stable	Ozone
Imperial, California	CA	61	D	Improving	PM2.5
El Paso, Texas	TX	60	D	Worsening	PM2.5
Bernalillo, New Mexico	NM	59	D	Worsening	Ozone
Harris, Texas	TX	59	D	Worsening	PM2.5
Wayne, Michigan	MI	58	C	Stable	PM2.5
Marion, Indiana	IN	57	C	Stable	PM2.5
Cook, Illinois	IL	57	D	Stable	PM2.5
Salt Lake, Utah	UT	57	D	Worsening	Ozone
Inyo, California	CA	57	F	Worsening	Ozone
Stanislaus, California	CA	57	D	Improving	PM2.5
Jefferson, Alabama	AL	57	C	Stable	PM2.5
Allegheny, Pennsylvania	PA	56	C	Stable	PM2.5
Madera, California	CA	56	C	Improving	Ozone
Cuyahoga, Ohio	OH	56	C	Worsening	PM2.5
Hamilton, Ohio	OH	55	C	Improving	PM2.5
Lancaster, Pennsylvania	PA	55	C	Stable	PM2.5
St. Louis City, Missouri	MO	55	C	Stable	PM2.5
Madison, Illinois	IL	55	C	Worsening	PM2.5
Bexar, Texas	TX	54	C	Stable	PM2.5
Placer, California	CA	54	D	Worsening	Ozone
Dona Ana, New Mexico	NM	54	D	Stable	Ozone
Merced, California	CA	54	C	Improving	Ozone
Missoula, Montana	MT	54	C	Improving	PM2.5
Orange, California	CA	54	C	Improving	PM2.5
Denver, Colorado	CO	54	C	Stable	PM2.5
Jefferson, Kentucky	KY	54	C	Stable	PM2.5
Pima, Arizona	AZ	53	C	Worsening	Ozone
Oklahoma, Oklahoma	OK	53	C	Worsening	PM2.5
Sacramento, California	CA	53	C	Improving	Ozone
Tarrant, Texas	TX	53	D	Worsening	PM2.5
Chaffee, Colorado	CO	53	C	Worsening	Ozone
Fulton, Georgia	GA	53	C	Stable	PM2.5
Henderson, Kentucky	KY	53	D	Worsening	PM2.5
Lake, Indiana	IN	53	C	Stable	PM2.5
Weld, Colorado	CO	53	D	Worsening	Ozone
Pulaski, Arkansas	AR	53	C	Stable	PM2.5
Hinds, Mississippi	MS	53	C	Stable	PM2.5
Plumas, California	CA	52	D	Worsening	PM2.5
Sutter, California	CA	52	C	Improving	PM2.5
Duval, Florida	FL	52	C	Worsening	PM2.5
Lee, North Carolina	NC	52	C	Stable	PM2.5
Philadelphia, Pennsylvania	PA	52	C	Improving	PM2.5
Calcasieu, Louisiana	LA	52	C	Stable	PM2.5
Scott, Iowa	IA	52	B	Improving	PM2.5
Travis, Texas	TX	52	C	Worsening	PM2.5
Butte, California	CA	52	C	Improving	PM2.5
Cameron, Texas	TX	52	C	Worsening	PM2.5
Davidson, Tennessee	TN	52	C	Stable	PM2.5
Lincoln, Montana	MT	52	C	Worsening	PM2.5
Cleveland, Oklahoma	OK	51	C	Worsening	PM2.5
Jackson, Missouri	MO	51	C	Worsening	PM2.5
Ottawa, Oklahoma	OK	51	C	Worsening	PM2.5
San Luis Obispo, California	CA	51	C	Improving	PM2.5
Tulsa, Oklahoma	OK	51	C	Stable	PM2.5
Bowie, Texas	TX	51	C	Stable	PM2.5
Clinton, Iowa	IA	51	C	Improving	PM2.5
Larimer, Colorado	CO	51	C	Stable	Ozone
Montgomery, Ohio	OH	51	C	Stable	PM2.5
Uintah, Utah	UT	51	D	Worsening	Ozone
Will, Illinois	IL	51	C	Stable	PM2.5

Frequently Asked Questions

Air quality is acceptable. Some pollutants may be a concern for sensitive individuals. The AQI (Air Quality Index) is a standardized EPA measure from 0-500 that communicates daily air quality levels.

72 of 1,020 monitored US cities have a 5-year average AQI in the moderate range (51-100).

People with respiratory conditions (asthma, COPD), heart disease, children, and older adults may experience symptoms when AQI is in the Moderate range. They should consider reducing prolonged outdoor exertion on higher-AQI days.

Sources: EPA Air Quality System (AQS)

Last updated: April 2026

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