Metro area air quality · 2025

Jasper, IN

Median AQI 39 (Good). 69.7% of monitored days rated Good across this metro's EPA monitoring network.

39
Median AQI
69.7%
Good-air days
0
Unhealthy days
45%
Cleaner than US metros

Jasper, IN posted a 2025 median AQI of 39 (Good) with 69.7% Good days

According to the U.S. EPA Air Quality System, the Jasper, IN CBSA recorded a median AQI of 39 across 363 monitored days in 2025, with 69.7% 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 Jasper, IN CBSA's 69.7% Good-day share places it cleaner than 45% of US metros in 2025.
Closest median-AQI peer
Bay City, MI (70.4% Good, median AQI 39) is the closest nationwide median-AQI peer to Jasper, IN.
2020–2025 Good-day shift
Jasper, IN's Good-day share moved +6.3 points from 2020 to 2025 (median AQI -5).
Median AQI
Median AQI: 39

Aggregated from EPA Air Quality System (2025), 363 monitored days. EPA AQS →

The verdict

Jasper, IN's peak reading 88 stays in the lower max-AQI tercile on this extract. On the EPA scale the metro runs good, more polluted than the median US metro, with a median AQI of 39 and 69.7% of 363 monitored days in the Good band.

39
median AQI · Good
69.7%
days rated Good
45%
cleaner than US metros
88
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
  • Jasper, IN metro's Good-day share fell from 72.4% to 69.7% between the 2024 and 2025 EPA annual releases, a change of -2.7 percentage points.
  • Jasper, IN metro's peak single-day AQI rose from 70 to 88 between the 2024 and 2025 EPA annual releases, a change of +18 points.

Compared against 366 monitored days in 2024 and 363 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

Jasper, IN's peak reading 88 stays in the lower max-AQI tercile on this extract. Signature read: peak AQI 88 (low tercile vs CBSA corpus). Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 39 over 363 measured days in 2025 (Good / Moderate). The monitored-day split lands at 253 Good (70%), 110 Moderate (30%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 58; the highest single-day reading hit 88 (Moderate).

Across 2020–2025, Good-day share shifted +6.3 points and median AQI moved -5 (improving). No Unhealthy-tier days appear in this annual dataset. Metros with comparable AQI profiles include Bay City, MI (70.4% good, AQI 39); Brainerd, MN (74.3% good, AQI 39); Cambridge, MD (86.0% good, AQI 39).

Understanding AQI →

Air Quality Summary

Median AQI

39

Good

Good Days

69.7%

253 of 363 days

Max AQI

88

Moderate

Health Grade

Moderate

90th pct: 58

AQI Day Breakdown (2025)

Distribution of 363 monitored days across EPA AQI categories.

Good

253

70%

Moderate

110

30%

USG

0

0%

Unhealthy

0

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Moderate

The Jasper, IN metro area's air quality is rated Moderate based on 69.7% 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 Jasper, IN metro compare?

How Jasper, IN compares

Good-day share worse than typical
Jasper, IN 69.7%
Bay City, MI 70.4%
Typical US metro 70.6%
Median AQI better than typical
Jasper, IN 39
Bay City, MI 39
Typical US metro 41
Unhealthy days / yr better than typical
Jasper, IN 0
Bay City, MI 0
Typical US metro 1

5-Year Air Quality Trend

Air quality is improving in the Jasper, IN metro. Highest Good-day share: 2024 (72.4%, 265 of 366 monitored days).

Year Good Moderate Unhealthy Median AQI
2020 78 45 0 44
2021 77 48 0 43
2022 80 43 0 42
2023 152 86 0 44
2024 265 101 0 39
2025 253 110 0 39

Metros with a similar median AQI

CBSA peers nationwide whose annual median AQI sits near Jasper, IN (39).

Bay City, MI

Median AQI 39 · 70.4% Good-day share

39

Brainerd, MN

Median AQI 39 · 74.3% Good-day share

39

Cambridge, MD

Median AQI 39 · 86.0% Good-day share

39

Charleston, WV

Median AQI 39 · 77.0% Good-day share

39

Dalton, GA

Median AQI 39 · 90.3% Good-day share

39

Harrisonburg, VA

Median AQI 39 · 80.0% Good-day share

39

Metros with similar unhealthy-day exposure

A second relationship type: metros whose unhealthy-or-worse day count is closest to Jasper, 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

Akron, OH

0 unhealthy-or-worse days · median AQI 45

45

Albany, GA

0 unhealthy-or-worse days · median AQI 46

46

Albany, OR

0 unhealthy-or-worse days · median AQI 27

27

Frequently Asked Questions

What is the 90th percentile AQI for Jasper, IN? ▼
The 90th percentile AQI for the Jasper, IN metro area is 58, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 88 (Moderate).
How many unhealthy air days does Jasper, IN have? ▼
In 2025, the Jasper, IN metro area recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 88.
What is the air quality in the Jasper, IN metro area? ▼
The Jasper, IN metro area has a median Air Quality Index (AQI) of 39, rated "Good." 69.7% of monitored days (253 out of 363) had good air quality in 2025.
Is air quality in Jasper, IN getting better or worse? ▼
Air quality in the Jasper, IN metro 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: 2024 at 72.4% (265 of 366 days). Lowest qualifying Good-day share: 2021 at 61.6% (77 of 125 days).
What does AQI 39 mean for health? ▼
An AQI of 39 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 Jasper, IN compare to other metro areas? ▼
The Jasper, IN metro has 69.7% good air days. Similar metros: Bay City, MI (70.4% good), Brainerd, MN (74.3% good), Cambridge, MD (86.0% good).

Data Sources

Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset for Jasper, 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, Jasper, IN · 2020–2025