Metro area air quality · 2025

Terre Haute, IN

Median AQI 45 (Good). 59.7% of monitored days rated Good across this metro's EPA monitoring network.

45
Median AQI
59.7%
Good-air days
0
Unhealthy days
25%
Cleaner than US metros

Terre Haute, IN posted a 2025 median AQI of 45 (Good) with 59.7% Good days

According to the U.S. EPA Air Quality System, the Terre Haute, IN CBSA recorded a median AQI of 45 across 365 monitored days in 2025, with 59.7% rated Good and 0 unhealthy or worse. This is an annual metro comparison, not a live advisory.

Data source EPA Air Quality System (AQS)

Cleaner than US metros
The Terre Haute, IN CBSA's 59.7% Good-day share places it cleaner than 25% of US metros in 2025.
Closest median-AQI peer
Akron, OH (61.6% Good, median AQI 45) is the closest nationwide median-AQI peer to Terre Haute, IN.
2020–2025 Good-day shift
Terre Haute, IN's Good-day share moved -0.4 points from 2020 to 2025 (median AQI -2).
Median AQI
Median AQI: 45

Aggregated from EPA Air Quality System (2025), 365 monitored days. EPA AQS →

The verdict

Terre Haute, IN lands in the lower Good-day tercile (59.7% Good), a thinner clean-air share than most CBSA peers here. On the EPA scale the metro runs good, more polluted than the median US metro, with a median AQI of 45 and 59.7% of 365 monitored days in the Good band.

45
median AQI · Good
59.7%
days rated Good
25%
cleaner than US metros
108
worst single reading

No day crossed into the Unhealthy tier across the metro's monitors in 2025.

Annual release change

What changed in the 2025 EPA annual release

2024 → 2025
  • Terre Haute, IN metro's Good-day share rose from 55.9% to 59.9% between the 2024 and 2025 EPA annual releases, a change of +4.0 percentage points.

Compared against 365 monitored days in 2024 and 364 in 2025. These are arithmetic differences between two stored EPA annual summaries, not a cause claim or a live advisory.

National release changes Two-year CSV

Terre Haute, IN lands in the lower Good-day tercile (59.7% Good), a thinner clean-air share than most CBSA peers here. Signature read: 59.7% Good-day share (low tercile vs CBSA corpus). Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 45 over 365 measured days in 2025 (Good / Moderate). The monitored-day split lands at 218 Good (60%), 146 Moderate (40%), and 1 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 65; the highest single-day reading hit 108 (USG).

Across 2020–2025, Good-day share shifted -0.4 points and median AQI moved -2 (stable). No Unhealthy-tier days appear in this annual dataset. Metros with comparable AQI profiles include Akron, OH (61.6% good, AQI 45); Ardmore, OK (67.9% good, AQI 45); Asheville, NC (69.9% good, AQI 45).

Health effects of air pollution →

Air Quality Summary

Median AQI

45

Good

Good Days

59.7%

218 of 365 days

Max AQI

108

USG

Health Grade

Moderate

90th pct: 65

AQI Day Breakdown (2025)

Distribution of 365 monitored days across EPA AQI categories.

Good

218

60%

Moderate

146

40%

USG

1

0%

Unhealthy

0

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Moderate

The Terre Haute, IN metro area's air quality is rated Moderate based on 59.7% good air days. No unhealthy air days were recorded in 2025.

Air quality is generally acceptable. Unusually sensitive people should monitor real-time conditions at AirNow.gov during high-pollution events.

How does the Terre Haute, IN metro compare?

How Terre Haute, IN compares

Good-day share worse than typical
Terre Haute, IN 59.7%
Akron, OH 61.6%
Typical US metro 70.6%
Median AQI worse than typical
Terre Haute, IN 45
Akron, OH 45
Typical US metro 41
Unhealthy days / yr better than typical
Terre Haute, IN 0
Akron, OH 0
Typical US metro 1

5-Year Air Quality Trend

Air quality is stable in the Terre Haute, IN metro. Highest Good-day share: 2020 (60.3%, 220 of 365 monitored days).

Year Good Moderate Unhealthy Median AQI
2020 220 145 0 47
2021 172 193 0 51
2022 203 160 0 47
2023 182 175 1 51
2024 204 161 0 47
2025 218 146 0 45

Metros with a similar median AQI

CBSA peers nationwide whose annual median AQI sits near Terre Haute, IN (45).

Akron, OH

Median AQI 45 · 61.6% Good-day share

45

Ardmore, OK

Median AQI 45 · 67.9% Good-day share

45

Asheville, NC

Median AQI 45 · 69.9% Good-day share

45

Cheyenne, WY

Median AQI 45 · 75.1% Good-day share

45

Clinton, IA

Median AQI 45 · 59.5% Good-day share

45

Fort Dodge, IA

Median AQI 45 · 59.2% Good-day share

45

Metros with similar unhealthy-day exposure

A second relationship type: metros whose unhealthy-or-worse day count is closest to Terre Haute, IN's 0 (independent of median AQI).

Aberdeen, SD

0 unhealthy-or-worse days · median AQI 27

27

Aberdeen, WA

0 unhealthy-or-worse days · median AQI 22

22

Adrian, MI

0 unhealthy-or-worse days · median AQI 41

41

Albany, GA

0 unhealthy-or-worse days · median AQI 46

46

Albany, OR

0 unhealthy-or-worse days · median AQI 27

27

Albany-Schenectady-Troy, NY

0 unhealthy-or-worse days · median AQI 41

41

Frequently Asked Questions

How many unhealthy air days does Terre Haute, IN have? ▼
In 2025, the Terre Haute, IN metro area recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 108.
What is the air quality in the Terre Haute, IN metro area? ▼
The Terre Haute, IN metro area has a median Air Quality Index (AQI) of 45, rated "Good." 59.7% of monitored days (218 out of 365) had good air quality in 2025.
Is air quality in Terre Haute, IN getting better or worse? ▼
Air quality in the Terre Haute, IN metro is stable across floor-qualifying years (2020-2025); years with fewer than 100 monitored days are excluded from that direction. Highest qualifying Good-day share: 2020 at 60.3% (220 of 365 days). Lowest qualifying Good-day share: 2021 at 47.1% (172 of 365 days).
What does AQI 45 mean for health? ▼
An AQI of 45 is "Good", air quality is satisfactory and poses little or no health risk. This is the best category on the EPA's AQI scale.
How does Terre Haute, IN compare to other metro areas? ▼
The Terre Haute, IN metro has 59.7% good air days. Similar metros: Akron, OH (61.6% good), Ardmore, OK (67.9% good), Asheville, NC (69.9% good).
What is the 90th percentile AQI for Terre Haute, IN? ▼
The 90th percentile AQI for the Terre Haute, IN metro area is 65, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 108 (USG).

Data Sources

Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset for Terre Haute, IN, 2025. See our methodology for how AQI, median, and coverage figures are computed.

Read our methodology , how this data is sourced, computed, and verified.

Source: U.S. EPA Air Quality System (AQS) Annual AQI by CBSA summary, Terre Haute, IN · 2020–2025