New Boston, Ohio Air Quality
New Boston has a median AQI of 45, earning an air quality grade of A- — excellent air quality that ranks better than 27% of US cities. Air quality has been trending worse over the past decade, a concern for local residents and health officials. Particulate matter (PM2.5) is the primary concern, often linked to vehicle traffic, industrial activity, and wildfire smoke. In 2025, New Boston recorded 160 good air quality days (59% of monitored days) and 1 unhealthy days.
Population: 2,470 • County: Scioto
Current AQI
Quick Facts
| Current AQI | 19 — Good |
| Air Quality Grade | A- |
| Median AQI (2025) | 45 |
| vs. U.S. Cities | Better than 27% |
| Primary Pollutant | PM2.5 |
| Unhealthy Days/Year | 1 |
| 10-Year Trend | ↓ Worsening |
| 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 New Boston is sourced from the Portsmouth Water Treatment Plant monitoring area, located approximately 1 miles from city center. This EPA-certified station continuously tracks particulate matter (PM2.5), the primary driver of air quality alerts in this area.
New Boston tends to see elevated PM2.5 readings during fall and winter months when temperature inversions trap pollutants near the surface. Wood burning, vehicle exhaust, and reduced wind speeds compound the effect. Residents with respiratory conditions should monitor forecasts closely between November and February.
AQI Trend (10 Years)
Air Quality Days by Year
New Boston Median AQI by Year
Annual EPA air quality data for New Boston — median AQI, day-category breakdown, and primary pollutant per year.
| Year | Median AQI | Good Days | Unhealthy Days | Max AQI | Primary Pollutant |
|---|---|---|---|---|---|
| 2025 | 45 | 160 | 2 | 238 | PM2.5 |
| 2024 | 40 | 248 | — | 80 | PM2.5 |
| 2023 | 44 | 223 | 7 | 172 | PM2.5 |
| 2022 | 17 | 340 | — | 74 | PM10 |
| 2021 | 16 | 333 | — | 86 | PM10 |
| 2020 | 14 | 347 | — | 93 | PM10 |
| 2019 | 14 | 337 | — | 78 | PM10 |
| 2018 | 13 | 338 | — | 84 | PM10 |
| 2017 | 13 | 344 | — | 70 | PM10 |
| 2016 | 15 | 321 | 1 | 129 | PM10 |
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 New Boston Air Quality
What is the air quality in New Boston today?
The current AQI in New Boston is 19, 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 New Boston getting better or worse?
Air quality in New Boston has been worsening. The median AQI has risen 30 points (from 15 in 2016 to 45 in 2025), a concern for local health officials.
What is the most common air pollutant in New Boston?
PM2.5 is the primary air pollutant in New Boston, responsible for 266 days (97% of monitored days) in 2025. Particulate matter originates from vehicle exhaust, wildfires, construction, and industrial activity.
How many unhealthy air days does New Boston have per year?
In 2025, New Boston recorded 59% good air quality days (160 days) out of 273 monitored days. There were 1 Unhealthy for Sensitive Groups days and 0 Unhealthy days (AQI above 100). The most severe category (Very Unhealthy or Hazardous) occurred on 1 day. The highest single-day AQI recorded was 238.
What air quality grade does New Boston receive?
New Boston receives an air quality grade of A-, placing it better than 27% of US cities. This is based on a median AQI of 45 in 2025, with 160 good air quality days. The EPA monitors air quality in this area continuously using certified monitoring stations.
Air Quality Grade
Better than 27% of US cities
Nearby Cities
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National Rankings
See how New Boston compares to every other US city by air quality.
Best Air Quality Cities →All city rankingsRecommended Air Purifiers for New Boston
New Boston sees its worst PM2.5 during winter temperature inversions when particulates get trapped near ground level. A unit with True HEPA and an auto-mode sensor is most effective for responding to these spikes.
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