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AirHistory

Air Quality in Ohio

10-year air quality trends for 40 monitored areas in Ohio.

See full Ohio air quality rankings →
40
Cities
40
Avg AQI (5yr)
27
Improving
4
Stable
9
Worsening

All Monitored Areas in Ohio

Columbiana, Ohio

Columbiana County · AQI 12 (5yr avg) · Improving · PM10

A

Athens, Ohio

Athens County · AQI 30 (5yr avg) · Improving · PM2.5

B

Clermont, Ohio

Clermont County · AQI 42 (5yr avg) · Improving · PM2.5

B

Belmont, Ohio

Belmont County · AQI 18 (5yr avg) · Worsening · NO2

B

Greene, Ohio

Greene County · AQI 41 (5yr avg) · Improving · PM2.5

B

Lake, Ohio

Lake County · AQI 41 (5yr avg) · Improving · PM2.5

B

Warren, Ohio

Warren County · AQI 45 (5yr avg) · Improving · PM2.5

B

Fayette, Ohio

Fayette County · AQI 36 (5yr avg) · Stable · Ozone

B

Harrison, Ohio

Harrison County · AQI 10 (5yr avg) · Worsening · CO

B

Adams, Ohio

Adams County · AQI 34 (5yr avg) · Stable · PM2.5

B

Delaware, Ohio

Delaware County · AQI 39 (5yr avg) · Stable · Ozone

B

Licking, Ohio

Licking County · AQI 40 (5yr avg) · Stable · Ozone

B

Noble, Ohio

Noble County · AQI 37 (5yr avg) · Stable · Ozone

B

Wood, Ohio

Wood County · AQI 38 (5yr avg) · Stable · Ozone

B

Ashtabula, Ohio

Ashtabula County · AQI 39 (5yr avg) · Stable · Ozone

B

Clinton, Ohio

Clinton County · AQI 41 (5yr avg) · Stable · Ozone

B

Geauga, Ohio

Geauga County · AQI 41 (5yr avg) · Stable · Ozone

B

Jefferson, Ohio

Jefferson County · AQI 50 (5yr avg) · Improving · PM2.5

B

Knox, Ohio

Knox County · AQI 40 (5yr avg) · Stable · Ozone

B

Lawrence, Ohio

Lawrence County · AQI 44 (5yr avg) · Improving · PM2.5

B

Madison, Ohio

Madison County · AQI 41 (5yr avg) · Stable · Ozone

B

Medina, Ohio

Medina County · AQI 42 (5yr avg) · Improving · PM2.5

B

Miami, Ohio

Miami County · AQI 40 (5yr avg) · Stable · Ozone

B

Washington, Ohio

Washington County · AQI 40 (5yr avg) · Stable · Ozone

B

Lorain, Ohio

Lorain County · AQI 39 (5yr avg) · Stable · PM2.5

B

Lucas, Ohio

Lucas County · AQI 44 (5yr avg) · Improving · PM2.5

B

Scioto, Ohio

Scioto County · AQI 21 (5yr avg) · Worsening · PM10

C

Trumbull, Ohio

Trumbull County · AQI 44 (5yr avg) · Stable · PM2.5

C

Mahoning, Ohio

Mahoning County · AQI 46 (5yr avg) · Stable · PM2.5

C

Preble, Ohio

Preble County · AQI 45 (5yr avg) · Stable · PM2.5

C

Summit, Ohio

Summit County · AQI 46 (5yr avg) · Stable · PM2.5

C

Allen, Ohio

Allen County · AQI 42 (5yr avg) · Worsening · Ozone

C

Clark, Ohio

Clark County · AQI 49 (5yr avg) · Stable · PM2.5

C

Portage, Ohio

Portage County · AQI 40 (5yr avg) · Worsening · Ozone

C

Franklin, Ohio

Franklin County · AQI 50 (5yr avg) · Stable · PM2.5

C

Hamilton, Ohio

Hamilton County · AQI 55 (5yr avg) · Improving · PM2.5

C

Montgomery, Ohio

Montgomery County · AQI 51 (5yr avg) · Stable · PM2.5

C

Stark, Ohio

Stark County · AQI 51 (5yr avg) · Worsening · PM2.5

C

Cuyahoga, Ohio

Cuyahoga County · AQI 56 (5yr avg) · Worsening · PM2.5

C

Butler, Ohio

Butler County · AQI 50 (5yr avg) · Worsening · Ozone

D
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Frequently Asked Questions

Ohio has 40 monitored areas with an average 5-year AQI of 40 and an average Air Quality Grade of B. 27 cities are improving, 9 are worsening, and 4 are stable.

Columbiana, Ohio has the best Air Quality Grade (A) in Ohio with a 5-year average AQI of 12.

Of 40 monitored areas in Ohio, 27 are showing improving trends, 9 are worsening, and 4 remain stable over the past decade.

Sources: EPA Air Quality System (AQS)
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