Median AQI
39
Good
Indiana · County air quality · 2025
Tippecanoe County, Indiana
Median AQI 39 (Good). 70.3% of monitored days rated Good, direct from EPA Air Quality System stations.
- 39
- Median AQI
- 70.3%
- Good-air days
- 0
- Unhealthy days
- 34%
- Cleaner than US counties
Tippecanoe County's 2025 annual median AQI is 39 (Good), with 70.3% Good days
According to the U.S. EPA Air Quality System, Tippecanoe County, Indiana posted a 2025 median AQI of 39 (Good) across 347 monitored days, with 70.3% rated Good and 0 unhealthy or worse. This is an annual comparison, not today's advisory.
Data source EPA Air Quality System (AQS)
- Cleaner than US
- Tippecanoe County's 70.3% Good-day share places it cleaner than 34% of US counties in 2025.
- Closest median-AQI peer
- Aiken County (90.6% Good, median AQI 39) is the closest nationwide median-AQI peer to Tippecanoe County.
- 2020–2025 trend
- Tippecanoe County's floor-qualifying Good-day share is improving from 2020 to 2025 (48.0% → 70.3%).
- Median AQI
- Median AQI: 39
The verdict
According to EPA Air Quality System monitoring data, Tippecanoe County's air is good on balance, more polluted than the median US county, a median AQI of 39 with 70.3% of 347 monitored days in the Good band, driven mainly by PM2.5.
- 39
- median AQI · Good
- 70.3%
- days rated Good
- PM2.5
- main pollutant
- 34%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 95.
Annual release change
What changed in the 2025 EPA annual release
- Tippecanoe County's Good-day share fell from 74.2% to 70.3% between the 2024 and 2025 EPA annual releases, a change of -3.9 percentage points.
- Tippecanoe County's peak single-day AQI rose from 67 to 95 between the 2024 and 2025 EPA annual releases, a change of +28 points.
- Tippecanoe County's median AQI rose from 35 to 39 between the 2024 and 2025 EPA annual releases, a change of +4 points.
Data updated August 2026
- Good · 244 d · 70.3%
- Moderate · 103 d · 29.7%
How did Tippecanoe County's air break down in 2025?
Across 347 monitored days, 244 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 95 (Moderate).
EPA AQS →Air quality data from EPA Air Quality System (2025). 347 days monitored. Median AQI: 39 (Good).
Insights: Tippecanoe County, Indiana. EPA monitors recorded a median Air Quality Index of 39 across 347 measured days in 2025, earning a Good classification and a Moderate health grade. Of those days, 244 (70%) fell in the Good band (AQI 0–50), 103 (30%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 58, while the worst single-day peak hit 95 (Moderate). Residents averaged about 21.1 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM2.5 (347 days). Across the 2020–2025 trend window, the share of monitored days rated Good shifted by +22.3 points and the median AQI moved -12 points, placing the multi-year trajectory at improving. The worst single reading over the 2020–2025 window was AQI 95, moderate but never Unhealthy. Nearby counties show comparable readings: Allen (60.0% good, AQI 44); Bartholomew (72.6% good, AQI 43); Boone (89.7% good, AQI 35); Brown (95.9% good, AQI 34); Carroll (90.8% good, AQI 35); Clark (58.1% good, AQI 46).
Air Quality Summary
Good Days
70.3%
244 of 347 monitored days
-4.7pp vs 75% target
Max AQI Recorded
95
Moderate
Health Grade
Moderate
90th-pct AQI 58
Tippecanoe County, Good days share 70.3%
National avg
Share of monitored days at AQI 0-50 (Good band).
Tippecanoe County, Unhealthy-or-worse share 0.0%
National avg
Share of monitored days above AQI 150 (Unhealthy or worse). Bar maxes at 10% (worst-county ceiling).
AQI Day Breakdown (2025)
Distribution of 347 monitored days across EPA AQI categories.
Good
244
70%
Moderate
103
30%
USG
0
0%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Tippecanoe County.
- PM2.5 · 347 days · 100.0%
Health Impact Assessment
Moderate
Tippecanoe County's air quality is rated Moderate based on 70.3% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 70.3% of monitored days in 2025, with a median AQI of 39. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is PM2.5, driving AQI on 347 of 347 monitored days.
5-Year Air Quality Trend
Air quality is improving in Tippecanoe County. Highest Good-day share: 2022 (76.6%, 268 of 350 monitored days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 167 | 181 | 0 | 0 | 51 | 73 |
| 2021 | 213 | 136 | 0 | 0 | 44 | 97 |
| 2022 | 268 | 82 | 0 | 0 | 36 | 96 |
| 2023 | 237 | 106 | 4 | 1 | 42 | 206 |
| 2024 | 256 | 89 | 0 | 0 | 35 | 67 |
| 2025 | 244 | 103 | 0 | 0 | 39 | 95 |
How does Tippecanoe County compare?
How Tippecanoe County compares
Good-day share worse than typical
Tippecanoe County 70.3%
Aiken County, South Carolina 90.6%
Typical US county 76.0%
Median AQI about typical
Tippecanoe County 39
Aiken County, South Carolina 39
Typical US county 39
Unhealthy days / yr better than typical
Tippecanoe County 0
Aiken County, South Carolina 0
Typical US county 1
Counties with a similar median AQI
Nationwide peers within about the same annual median AQI as Tippecanoe County (39), not geographic neighbors.
Aiken County, South Carolina
Median AQI 39 · 90.6% Good-day share
Albany County, New York
Median AQI 39 · 68.5% Good-day share
Anderson County, Tennessee
Median AQI 39 · 94.3% Good-day share
Bay County, Michigan
Median AQI 39 · 70.4% Good-day share
Berkeley County, West Virginia
Median AQI 39 · 83.6% Good-day share
Boyd County, Kentucky
Median AQI 39 · 80.0% Good-day share
Same primary pollutant: PM2.5
PM2.5 led the AQI on the most monitored days here. These peers share that driver and the closest Good-day share (a second relationship type beyond median-AQI neighbors).
Pottawattamie County, Iowa
70.3% Good-day share · median AQI 37
Boise County, Idaho
70.4% Good-day share · median AQI 42
Hancock County, Mississippi
70.1% Good-day share · median AQI 43
Johnson County, Iowa
70.1% Good-day share · median AQI 37
Macomb County, Michigan
70.1% Good-day share · median AQI 40
Ramsey County, Minnesota
70.1% Good-day share · median AQI 34
Indiana counties on the map
Geographic containment only, other monitored counties in Indiana, independent of AQI or pollutant match.
What Tippecanoe County's air means for you
The air here stays in the breathable range year-round, with PM2.5 the main thing to watch.
- Sensitive groups (asthma, heart conditions, children, older adults) should check the AQI on high-PM2.5 days, the guide explains what a median of 39 means for exposure. Health guidance
- See how Tippecanoe County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Tippecanoe County with its Indiana neighbours before drawing a conclusion about the region. All of Indiana
Based on 347 EPA-monitored days in 2025; figures reflect only days the monitors reported. Source: EPA Air Quality System annual summaries.
Keep exploring the annual AQI record
Air-quality reading list
Frequently Asked Questions
What is the air quality in Tippecanoe County, Indiana? ▼
Tippecanoe County has a median Air Quality Index (AQI) of 39, rated "Good." 70.3% of monitored days (244 out of 347) had good air quality in 2025.
What is the main pollutant in Tippecanoe County? ▼
The primary pollutant in Tippecanoe County is Fine Particles (PM2.5), which was the main AQI driver on 347 days (100% of monitored days). Penetrates deep into lungs and bloodstream. Linked to heart disease and premature death.
How many unhealthy air days does Tippecanoe County have? ▼
In 2025, Tippecanoe County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 95.
Is the air quality in Tippecanoe County getting better or worse? ▼
Air quality in Tippecanoe County is improving across floor-qualifying years (2020-2025); years with fewer than 100 monitored days are excluded from that direction. Highest qualifying Good-day share: 2022 at 76.6% (268 of 350 days). Lowest qualifying Good-day share: 2020 at 48.0% (167 of 348 days).
What does AQI 39 mean for health? ▼
Tippecanoe County's median AQI of 39 falls in the "Good" category. See the AQI category guide for what each range means for health.
How does Tippecanoe County compare to other counties in Indiana? ▼
Tippecanoe County has 70.3% good air days. Nearby counties in Indiana: Allen (60.0% good), Bartholomew (72.6% good), Boone (89.7% good), Brown (95.9% good), Carroll (90.8% good), Clark (58.1% good).
What is the 90th percentile AQI in Tippecanoe County? ▼
The 90th percentile AQI for Tippecanoe County is 58, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 95 (Moderate).
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 Tippecanoe County, Indiana · 2020–2025
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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.