Brownstown, Indiana Air Quality
Brownstown has a median AQI of 35, earning an air quality grade of A — excellent air quality that ranks better than 81% 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 2019, Brownstown recorded 340 good air quality days (94% of monitored days).
Population: 3,040 • County: Jackson
Current AQI
Quick Facts
| Current AQI | 17 — Good |
| Air Quality Grade | A |
| Median AQI (2019) | 35 |
| vs. U.S. Cities | Better than 81% |
| Primary Pollutant | Ozone |
| Unhealthy Days/Year | 0 |
| 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 Brownstown is sourced from the Bloomington - Binford monitoring area, located approximately 31 miles from city center. This EPA-certified station continuously tracks ground-level ozone, the primary driver of air quality alerts in this area.
Brownstown 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
Brownstown Median AQI by Year
Annual EPA air quality data for Brownstown — median AQI, day-category breakdown, and primary pollutant per year.
| Year | Median AQI | Good Days | Unhealthy Days | Max AQI | Primary Pollutant |
|---|---|---|---|---|---|
| 2019 | 35 | 340 | — | 80 | Ozone |
| 2018 | 32 | 321 | — | 90 | Ozone |
| 2017 | 40 | 206 | — | 93 | Ozone |
| 2016 | 40 | 146 | 2 | 129 | Ozone |
Source: EPA Air Quality System (AQS) annual summaries. "Unhealthy Days" includes Unhealthy for Sensitive Groups, Unhealthy, Very Unhealthy, and Hazardous categories.
2019 Air Quality Summary
Primary Pollutant Days (2019)
Days when each pollutant was the primary driver of AQI. Learn about pollutants →
Frequently Asked Questions About Brownstown Air Quality
What is the air quality in Brownstown today?
The current AQI in Brownstown is 17, 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 Brownstown getting better or worse?
Air quality in Brownstown has been improving. The median AQI has dropped 5 points (from 40 in 2016 to 35 in 2019), a positive trend for residents.
What is the most common air pollutant in Brownstown?
Ozone is the primary air pollutant in Brownstown, responsible for 360 days (100% of monitored days) in 2019. 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 Brownstown have per year?
In 2019, Brownstown recorded 94% good air quality days (340 days) out of 360 monitored days. There were 0 Unhealthy for Sensitive Groups days and 0 Unhealthy days (AQI above 100). The highest single-day AQI recorded was 80.
What air quality grade does Brownstown receive?
Brownstown receives an air quality grade of A, placing it better than 81% of US cities. This is based on a median AQI of 35 in 2019, with 340 good air quality days. The EPA monitors air quality in this area continuously using certified monitoring stations.
Air Quality Grade
Better than 81% of US cities
Nearby Cities
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National Rankings
See how Brownstown compares to every other US city by air quality.
Best Air Quality Cities →All city rankingsRecommended Air Purifiers for Brownstown
Ozone is Brownstown'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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