Pleasant Plain, Ohio Air Quality
Pleasant Plain has a median AQI of 44, earning an air quality grade of A- — excellent air quality that ranks better than 31% of US cities. Air quality has been improving steadily over the past decade, a positive sign for residents. Ground-level ozone is the primary concern, typically peaking on warm sunny days due to vehicle and industrial emissions. In 2025, Pleasant Plain recorded 178 good air quality days (65% of monitored days) and 7 unhealthy days.
Population: 190 • County: Warren
Current AQI
Quick Facts
| Current AQI | 21 — Good |
| Air Quality Grade | A- |
| Median AQI (2025) | 44 |
| vs. U.S. Cities | Better than 31% |
| Primary Pollutant | Ozone |
| Unhealthy Days/Year | 7 |
| 10-Year Trend | ↑ Improving |
| Data Source | EPA AQS (historical) · AirNow (live) |
Health Recommendation
Air quality is satisfactory, and air pollution poses little or no risk.
It's a great day to be active outside!
5-Day AQI Forecast
Last 90 Days
Current Pollutant Levels
Real-time data from EPA AirNow
Local Air Quality Context
Air quality data for Pleasant Plain is sourced from the Lebanon monitoring area, located approximately 11 miles from city center. This EPA-certified station continuously tracks ground-level ozone, the primary driver of air quality alerts in this area.
Pleasant Plain has relatively consistent air quality throughout the year without a strong seasonal peak. Air quality is primarily influenced by local traffic, industrial activity, and regional weather patterns rather than a single seasonal driver.
AQI Trend (10 Years)
Air Quality Days by Year
Pleasant Plain Median AQI by Year
Annual EPA air quality data for Pleasant Plain — median AQI, day-category breakdown, and primary pollutant per year.
| Year | Median AQI | Good Days | Unhealthy Days | Max AQI | Primary Pollutant |
|---|---|---|---|---|---|
| 2025 | 44 | 178 | 7 | 126 | Ozone |
| 2024 | 43 | 267 | 6 | 147 | Ozone |
| 2023 | 44 | 230 | 7 | 183 | PM2.5 |
| 2022 | 44 | 231 | 3 | 133 | PM2.5 |
| 2021 | 44 | 230 | 2 | 119 | PM2.5 |
| 2020 | 44 | 248 | 4 | 115 | PM2.5 |
| 2019 | 47 | 210 | 3 | 122 | PM2.5 |
| 2018 | 48 | 201 | 5 | 136 | PM2.5 |
| 2017 | 49 | 185 | 1 | 115 | PM2.5 |
| 2016 | 50 | 186 | 9 | 129 | PM2.5 |
Source: EPA Air Quality System (AQS) annual summaries. "Unhealthy Days" includes Unhealthy for Sensitive Groups, Unhealthy, Very Unhealthy, and Hazardous categories.
2025 Air Quality Summary
Primary Pollutant Days (2025)
Days when each pollutant was the primary driver of AQI. Learn about pollutants →
Frequently Asked Questions About Pleasant Plain Air Quality
What is the air quality in Pleasant Plain today?
The current AQI in Pleasant Plain is 21, rated "Good". Air quality is good — outdoor activity is safe for everyone today. Air quality is satisfactory, and air pollution poses little or no risk.
Is air quality in Pleasant Plain getting better or worse?
Air quality in Pleasant Plain has been improving. The median AQI has dropped 6 points (from 50 in 2016 to 44 in 2025), a positive trend for residents.
What is the most common air pollutant in Pleasant Plain?
Ozone is the primary air pollutant in Pleasant Plain, responsible for 172 days (63% of monitored days) in 2025. Ground-level ozone forms when sunlight reacts with emissions from vehicles and industry, typically peaking on hot summer afternoons.
How many unhealthy air days does Pleasant Plain have per year?
In 2025, Pleasant Plain recorded 65% good air quality days (178 days) out of 272 monitored days. There were 7 Unhealthy for Sensitive Groups days and 0 Unhealthy days (AQI above 100). The highest single-day AQI recorded was 126.
What air quality grade does Pleasant Plain receive?
Pleasant Plain receives an air quality grade of A-, placing it better than 31% of US cities. This is based on a median AQI of 44 in 2025, with 178 good air quality days. The EPA monitors air quality in this area continuously using certified monitoring stations.
Air Quality Grade
Better than 31% of US cities
Nearby Cities
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National Rankings
See how Pleasant Plain compares to every other US city by air quality.
Best Air Quality Cities →All city rankingsRecommended Air Purifiers for Pleasant Plain
Ozone is Pleasant Plain's primary pollutant. Standard HEPA filters don't capture ozone molecules — you need activated carbon or PECO technology to chemically break them down. We highlight those units here.
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