Ohio Air Quality

AQI 52 · PM2.5 · Trend: Improving

State Overview

Average AQI	52
Good Days / Year	205
Unhealthy Days / Year	12
Primary Pollutant	PM2.5
PM2.5 Average	9.8 µg/m³
Trend	↓ Improving
Monitoring Stations	52
Nonattainment Areas	2

About Ohio Air Quality

Overall RatingModerate

Ohio's air quality reflects its industrial heritage, with the northeast (Cleveland/Akron) and southwest (Cincinnati) facing the most challenges. Coal plant retirements and steel production declines are gradually improving air quality across the state.

Major Pollution Sources

●Vehicle emissions
●Coal-fired power plants
●Steel manufacturing
●Chemical production
●Shale gas operations

Wildfire Risk & Industrial Zones

Wildfire Risk: Very Low

Industrial Zones: Cleveland steel corridor, Cincinnati Ohio River industry, Toledo refining/glass, Youngstown steel legacy, Columbus data centers

Regulations

Ohio EPA Division of Air Pollution Control manages standards. Vehicle emissions testing in urban counties (E-Check). Coal plant retirement accelerating.

EPA Non-Attainment Areas

Cleveland-Akron-Elyria — PM2.5 nonattainment. Cincinnati — ozone nonattainment. Ohio has multiple monitoring areas due to its industrial history.

Pollen Seasons in Ohio

Weed Pollen

Ohio is in the heart of the ragweed belt.

August — October

Very High

Mold Spores

Agricultural areas promote seasonal mold.

June — October

Moderate

Tree Pollen

Ohio's diverse forests produce heavy tree pollen in spring.

March — May

High

Grass Pollen

Bluegrass and timothy are common allergens.

May — July

Moderate

Cities in Ohio (6)

Columbus

Ozone · 55% good days

AQI 52

Toledo

PM2.5 · 56% good days

AQI 52

Dayton

Ozone · 56% good days

AQI 52

Akron

PM2.5 · 54% good days

AQI 54

Cincinnati

Ozone · 52% good days

AQI 55

Cleveland

PM2.5 · 50% good days

AQI 58

Frequently Asked Questions

What is the average air quality in Ohio?

Ohio has an average AQI of 52. The state has approximately 205 good air quality days per year and 12 unhealthy days. The primary pollutant is PM2.5. The air quality trend is improving.

How many air quality monitors does Ohio have?

Ohio operates 52 air quality monitoring stations. The state has 2 nonattainment areas — regions that do not meet federal air quality standards for one or more pollutants.

Is air quality improving in Ohio?

The air quality trend in Ohio is improving. Environmental regulations and cleaner energy sources are contributing to better air quality.

What is the main pollutant in Ohio?

The primary pollutant in Ohio is PM2.5. The average PM2.5 level is 9.8 μg/m³. This is below the EPA annual standard of 12 μg/m³.

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Pollen Seasons in Ohio

Weed Pollen

Ohio is in the heart of the ragweed belt.

August — October

Very High

Mold Spores

Agricultural areas promote seasonal mold.

June — October

Moderate

Tree Pollen

Ohio's diverse forests produce heavy tree pollen in spring.

March — May

High

Grass Pollen

Bluegrass and timothy are common allergens.

May — July

Moderate

Frequently Asked Questions

What is the average air quality in Ohio?

Ohio has an average AQI of 52. The state has approximately 205 good air quality days per year and 12 unhealthy days. The primary pollutant is PM2.5. The air quality trend is improving.

How many air quality monitors does Ohio have?

Ohio operates 52 air quality monitoring stations. The state has 2 nonattainment areas — regions that do not meet federal air quality standards for one or more pollutants.

Is air quality improving in Ohio?

The air quality trend in Ohio is improving. Environmental regulations and cleaner energy sources are contributing to better air quality.

What is the main pollutant in Ohio?

The primary pollutant in Ohio is PM2.5. The average PM2.5 level is 9.8 μg/m³. This is below the EPA annual standard of 12 μg/m³.