Noblesville, Indiana Air Quality
Noblesville has a median AQI of 47, earning an air quality grade of B+ — good air quality that ranks better than 21% of US cities. Air quality has remained relatively stable over the past decade. Particulate matter (PM2.5) is the primary concern, often linked to vehicle traffic, industrial activity, and wildfire smoke. In 2025, Noblesville recorded 159 good air quality days (58% of monitored days) and 5 unhealthy days.
Population: 73,362 • County: Hamilton
Current AQI
Quick Facts
| Current AQI | 39 — Good |
| Air Quality Grade | B+ |
| Median AQI (2025) | 47 |
| vs. U.S. Cities | Better than 21% |
| Primary Pollutant | PM2.5 |
| Unhealthy Days/Year | 5 |
| 10-Year Trend | → Stable |
| 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 Noblesville is sourced from the Indpls-Washington Park monitoring area, located approximately 17 miles from city center. This EPA-certified station continuously tracks particulate matter (PM2.5), the primary driver of air quality alerts in this area.
Noblesville 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
Noblesville Median AQI by Year
Annual EPA air quality data for Noblesville — median AQI, day-category breakdown, and primary pollutant per year.
| Year | Median AQI | Good Days | Unhealthy Days | Max AQI | Primary Pollutant |
|---|---|---|---|---|---|
| 2025 | 47 | 159 | 5 | 118 | PM2.5 |
| 2024 | 44 | 244 | 1 | 108 | PM2.5 |
| 2023 | 46 | 220 | 10 | 190 | PM2.5 |
| 2022 | 43 | 241 | — | 100 | PM2.5 |
| 2021 | 44 | 232 | — | 100 | PM2.5 |
| 2020 | 44 | 247 | — | 97 | PM2.5 |
| 2019 | 47 | 214 | 2 | 119 | PM2.5 |
| 2018 | 45 | 229 | 6 | 129 | PM2.5 |
| 2017 | 46 | 229 | 2 | 105 | PM2.5 |
| 2016 | 49 | 189 | 3 | 115 | 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 Noblesville Air Quality
What is the air quality in Noblesville today?
The current AQI in Noblesville is 39, 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 Noblesville getting better or worse?
Air quality in Noblesville has been stable. The median AQI has dropped 2 points (from 49 in 2016 to 47 in 2025).
What is the most common air pollutant in Noblesville?
PM2.5 is the primary air pollutant in Noblesville, responsible for 148 days (54% of monitored days) in 2025. Particulate matter originates from vehicle exhaust, wildfires, construction, and industrial activity.
How many unhealthy air days does Noblesville have per year?
In 2025, Noblesville recorded 58% good air quality days (159 days) out of 272 monitored days. There were 5 Unhealthy for Sensitive Groups days and 0 Unhealthy days (AQI above 100). The highest single-day AQI recorded was 118.
What air quality grade does Noblesville receive?
Noblesville receives an air quality grade of B+, placing it better than 21% of US cities. This is based on a median AQI of 47 in 2025, with 159 good air quality days. The EPA monitors air quality in this area continuously using certified monitoring stations.
Air Quality Grade
Better than 21% of US cities
Nearby Cities
Get AQI Alerts
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National Rankings
See how Noblesville compares to every other US city by air quality.
Best Air Quality Cities →All city rankingsRecommended Air Purifiers for Noblesville
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