Air pollution threatens the health of 12.0 million people across 88 districts in Ohio. The average PM2.5 level is 9.6 µg/m³—1.9× higher than the WHO guideline.
Brought to you by Amrit Sharma
Ohio faces significant air pollution challenges. 100% of districts exceed the WHO guideline for clean air. This is putting 12.0 million across 88 districts at risk.
The average PM2.5 over 2023 was 9.6µg/m³. That's 1.9 times the WHO guideline for clean air of 5µg/m³.
This is equivalent of everybody, including children, smoking about 159 cigarettes in a year.
If Ohio met the WHO guideline of 5 µg/m³, the average person would live 0.45 years longer.
That's 5.4M years of life stolen from 12.0 million people. Years of watching children grow up. Years of building a career. Years of quiet mornings and celebrations.
Lives cut short. Breathing kills.
The top 10 most polluted districts in Ohio. These areas face the greatest health burden from air pollution.
Distribution of population across different PM2.5 pollution levels. The WHO guideline is 5 µg/m³—only populations below this threshold are breathing safe air.
Complete air quality data for every district in Ohio, sorted by population.
| District | Population | PM2.5 µg/m³ | Years Lost |
|---|---|---|---|
| Franklin | 1.4M | 9.8 | 0.5 years |
| Cuyahoga | 1.4M | 10.8 | 0.6 years |
| Hamilton | 922K | 9.5 | 0.4 years |
| Summit | 560K | 10.2 | 0.5 years |
| Montgomery | 556K | 9.4 | 0.4 years |
| Lucas | 445K | 9.7 | 0.5 years |
| Butler | 387K | 9.7 | 0.5 years |
| Stark | 381K | 10.2 | 0.5 years |
| Lorain | 297K | 9.8 | 0.5 years |
| Warren | 240K | 9.3 | 0.4 years |
| Mahoning | 237K | 9.7 | 0.5 years |
| Lake | 231K | 9.3 | 0.4 years |
| Delaware | 217K | 9.6 | 0.4 years |
| Trumbull | 196K | 9.4 | 0.4 years |
| Clermont | 187K | 8.3 | 0.3 years |
| Licking | 180K | 8.7 | 0.4 years |
| Greene | 180K | 8.9 | 0.4 years |
| Medina | 168K | 9.8 | 0.5 years |
| Portage | 155K | 9.8 | 0.5 years |
| Fairfield | 146K | 8.6 | 0.4 years |
| Wood | 141K | 9.4 | 0.4 years |
| Clark | 133K | 8.9 | 0.4 years |
| Richland | 128K | 9.3 | 0.4 years |
| Wayne | 115K | 9.6 | 0.5 years |
| Allen | 108K | 9.2 | 0.4 years |
| Miami | 106K | 9.1 | 0.4 years |
| Columbiana | 95K | 9.6 | 0.5 years |
| Geauga | 92K | 9.3 | 0.4 years |
| Tuscarawas | 92K | 9.8 | 0.5 years |
| Ashtabula | 91K | 8.5 | 0.3 years |
| Muskingum | 87K | 9.2 | 0.4 years |
| Hancock | 80K | 9.1 | 0.4 years |
| Ross | 75K | 8.4 | 0.3 years |
| Erie | 75K | 9.1 | 0.4 years |
| Scioto | 73K | 8.0 | 0.3 years |
| Union | 70K | 9.1 | 0.4 years |
| Marion | 66K | 8.7 | 0.4 years |
| Athens | 64K | 8.8 | 0.4 years |
| Jefferson | 64K | 9.5 | 0.4 years |
| Belmont | 63K | 9.3 | 0.4 years |
| Washington | 60K | 9.3 | 0.4 years |
| Knox | 58K | 8.6 | 0.4 years |
| Sandusky | 58K | 9.0 | 0.4 years |
| Huron | 57K | 8.9 | 0.4 years |
| Pickaway | 54K | 8.9 | 0.4 years |
| Seneca | 53K | 8.8 | 0.4 years |
| Lawrence | 52K | 8.3 | 0.3 years |
| Shelby | 50K | 8.8 | 0.4 years |
| Ashland | 50K | 9.1 | 0.4 years |
| Darke | 49K | 8.9 | 0.4 years |
| Auglaize | 45K | 9.1 | 0.4 years |
| Logan | 44K | 9.1 | 0.4 years |
| Holmes | 44K | 9.3 | 0.4 years |
| Clinton | 44K | 8.5 | 0.3 years |
| Madison | 43K | 8.8 | 0.4 years |
| Mercer | 42K | 9.3 | 0.4 years |
| Fulton | 42K | 8.8 | 0.4 years |
| Highland | 41K | 8.2 | 0.3 years |
| Crawford | 40K | 8.9 | 0.4 years |
| Defiance | 38K | 9.1 | 0.4 years |
| Brown | 37K | 8.0 | 0.3 years |
| Williams | 37K | 8.7 | 0.4 years |
| Preble | 36K | 8.6 | 0.4 years |
| Guernsey | 36K | 9.4 | 0.4 years |
| Champaign | 35K | 8.7 | 0.4 years |
| Ottawa | 35K | 9.5 | 0.4 years |
| Coshocton | 35K | 9.3 | 0.4 years |
| Jackson | 32K | 8.4 | 0.3 years |
| Putnam | 32K | 9.1 | 0.4 years |
| Perry | 30K | 8.7 | 0.4 years |
| Gallia | 29K | 8.5 | 0.3 years |
| Hardin | 29K | 8.9 | 0.4 years |
| Morrow | 29K | 8.8 | 0.4 years |
| Fayette | 28K | 8.4 | 0.3 years |
| Henry | 27K | 9.1 | 0.4 years |
| Van Wert | 27K | 9.0 | 0.4 years |
| Pike | 27K | 8.2 | 0.3 years |
| Adams | 25K | 7.7 | 0.3 years |
| Hocking | 25K | 8.6 | 0.4 years |
| Carroll | 22K | 9.4 | 0.4 years |
| Wyandot | 21K | 8.9 | 0.4 years |
| Meigs | 19K | 8.7 | 0.4 years |
| Paulding | 17K | 9.2 | 0.4 years |
| Noble | 13K | 9.3 | 0.4 years |
| Harrison | 12K | 9.2 | 0.4 years |
| Monroe | 12K | 9.1 | 0.4 years |
| Morgan | 11K | 8.9 | 0.4 years |
| Vinton | 11K | 8.4 | 0.3 years |
Showing 88 districts, sorted by population (largest first). PM2.5 values are for 2023. Years lost calculated against WHO guideline of 5 µg/m³.