What is the air quality in Columbiana County, Ohio?

EPA monitors reported only 61 days for Columbiana County in 2025, below the 100-day floor used for annual conclusions. Within that limited sample, the median AQI was 12 and 61 days were rated Good; this does not describe the full year.

What is the main pollutant in Columbiana County?

The primary pollutant in Columbiana County is Coarse Particles (PM10), which was the main AQI driver on 61 days (100% of monitored days). Irritates airways and can aggravate asthma and bronchitis.

How many unhealthy air days does Columbiana County have?

Among 61 reported days in 2025, 0 reached Unhealthy or worse. Because the record is below 100 monitored days, that count cannot establish how many unhealthy days occurred across the full year.

Is the air quality in Columbiana County getting better or worse?

Insufficient trend data is available for Columbiana County.

What does AQI 12 mean for health?

The median of the 61 reported days was AQI 12, in the "Good" category. The limited sample is not enough to assign the county a full-year health grade. See the AQI category guide for day-level meaning and EPA AirNow for current conditions.

How does Columbiana County compare to other counties in Ohio?

Columbiana County is not placed in county comparisons because its 61-day record is below the 100-day comparison floor.

What is the 90th percentile AQI in Columbiana County?

The 90th percentile AQI for Columbiana County is 22, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 31 (Good).

Ohio · County air quality · 2025

Columbiana County, Ohio

Limited EPA sample: 61 monitored days, below the 100-day floor for a full-year verdict. The figures below describe only those reported days.

Compiled by PlainAirData · August 23, 2026

12
Sample median AQI: 100.0%
Good in sample: 0
Unhealthy in sample: 61
100-day comparison floor

Columbiana County has only 61 EPA-monitored days in 2025, below the 100-day annual floor

According to the U.S. EPA Air Quality System, Columbiana County, Ohio reported 61 monitored days in 2025. That sample is too thin for a full-year air-quality grade or peer ranking. Use the figures only as the reported-day record, and check AirNow for current conditions.

Data source EPA Air Quality System (AQS)

Monitored days: Columbiana County reported 61 monitored days in 2025, below the 100-day floor: sample-only, not a full-year peer rank.
Sample median AQI: Sample median AQI: 12
Annual floor: Annual floor: 100

Data updated August 2026

Good · 61 d · 100.0%

How did Columbiana County's reported sample break down in 2025?

Across 61 monitored days, 61 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 31 (Good).

EPA AQS →

Pollutant Breakdown

Days where each pollutant was the primary driver of AQI readings in Columbiana County.

PM10 · 61 days · 100.0%

Sample Coverage and Health Context

Limited sample

Columbiana County has no annual health grade because only 61 days were reported, below the 100-day floor. The 100.0% Good-day share describes only that sample.

Reported days do not reveal what happened during unmonitored parts of the year, including seasonal smoke, ozone, or inversion periods. Use these values as a description of the available EPA sample only, and check AirNow.gov for current health guidance.

The dominant pollutant is PM10, driving AQI on 61 of 61 monitored days.

5-Year Air Quality Trend

Air quality is being tracked in Columbiana County. The 2025 row is shown for transparency but excluded from the direction because it has fewer than 100 monitored days.

Year	Good	Moderate	Median AQI	Max AQI
2020	48	0	10	31
2021	61	0	16	35
2022	61	0	12	40
2023	60	1	11	74
2024	63	0	12	34
2025	61	0	12	31

Data Sources

Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by County dataset, 2020–2025 (aqs.epa.gov). For current conditions (not shown here — this page is historical annual data), see EPA AirNow (airnow.gov). See our methodology for how AQI, median, and coverage figures are computed.

Informational only, not professional advice. Data from EPA AQS. See our disclaimer. Spotted a figure that looks wrong? Report a correction.

Source: U.S. EPA Air Quality System (AQS) Annual AQI by county summary files for Columbiana County, Ohio · 2020–2025 Accessed 2026-08-23

Download this county's annual AQI row as CSV , with the same EPA fields and denominator shown on this page.

Every figure on PlainAirData is rendered directly from EPA AQS air-quality monitoring data, no number is typed in by an editor. This page draws directly on EPA AQS air-quality monitoring data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.