Metro area air quality · 2025

Indiana, PA

Median AQI 42 (Good). 67.5% of monitored days rated Good across this metro's EPA monitoring network.

42
Median AQI
67.5%
Good-air days
0
Unhealthy days
40%
Cleaner than US metros

Aggregated from EPA Air Quality System (2025), 212 monitored days. EPA AQS →

The verdict

The Indiana, PA metro runs good on the EPA scale, more polluted than the median US metro, a median AQI of 42 with 67.5% of 212 monitored days in the Good band.

42
median AQI · Good
67.5%
days rated Good
40%
cleaner than US metros
122
worst single reading

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

Insights: Indiana, PA metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 42 over 212 measured days in 2025, which corresponds to a Good band and a Moderate metro-wide health grade. The monitored-day split lands at 143 Good days (67%), 68 Moderate (32%), and 1 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 61 while the highest single-day reading hit 122 (USG). Metro residents averaged roughly 20.2 clean-air days per 30-day window across the reporting year.

Across the 2020–2025 trend window, good days shifted by -177 and the median AQI moved +5 points, which classifies the multi-year trajectory as worsening. The metro avoided any Unhealthy-tier days entirely, an outcome that typically reflects favorable wind patterns, lower industrial density, or effective regional emission controls. Metros with comparable AQI profiles include Albany-Schenectady-Troy, NY (66.3% good, AQI 42); Bismarck, ND (75.8% good, AQI 42); Bloomington, IN (70.1% good, AQI 42).

Air Quality Summary

Median AQI

42

Good

Good Days

67.5%

143 of 212 days

Max AQI

122

USG

Health Grade

Moderate

90th pct: 61

AQI Day Breakdown (2025)

Distribution of 212 monitored days across EPA AQI categories.

Good

143

67%

Moderate

68

32%

USG

1

0%

Unhealthy

0

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Moderate

The Indiana, PA metro area's air quality is rated Moderate based on 67.5% 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 Indiana, PA metro compare?

How Indiana, PA compares

Good-day share worse than US avg
Indiana, PA 67.5%
Albany-Schenectady-Troy, NY 66.3%
US average 71.3%
Median AQI worse than US avg
Indiana, PA 42
Albany-Schenectady-Troy, NY 42
US average 41
Unhealthy days / yr better than US avg
Indiana, PA 0
Albany-Schenectady-Troy, NY 0
US average 1

5-Year Air Quality Trend

Air quality is worsening in the Indiana, PA metro. Best year: 2020 (320 good days).

Year Good Moderate Unhealthy Median AQI
2020 320 30 0 37
2021 218 128 0 44
2022 264 100 0 42
2023 264 92 2 41
2024 291 66 0 37
2025 143 68 0 42

Metros with Similar Air Quality

Metro areas across the US with a similar median AQI to Indiana, PA.

Albany-Schenectady-Troy, NY

AQI 42 · 66.3% good

42

Bismarck, ND

AQI 42 · 75.8% good

42

Bloomington, IN

AQI 42 · 70.1% good

42

Cape Coral-Fort Myers, FL

AQI 42 · 74.4% good

42

Daphne-Fairhope-Foley, AL

AQI 42 · 72.2% good

42

Decatur, AL

AQI 42 · 81.1% good

42

More Air Quality Data

Explore EPA air quality rankings and guides across U.S. metros and counties.

Cleanest Metro Areas

U.S. metros ranked by their share of Good air-quality days.

Worst Air Quality

Counties and metros with the most unhealthy air days.

All Metro Areas

Annual AQI by CBSA for every monitored U.S. metro area.

Best and Worst City Air

What drives urban air quality and how metro areas compare.

Air Quality Guides

Frequently Asked Questions

What is the air quality in the Indiana, PA metro area? ▼
The Indiana, PA metro area has a median Air Quality Index (AQI) of 42, rated "Good." 67.5% of monitored days (143 out of 212) had good air quality in 2025.
How many unhealthy air days does Indiana, PA have? ▼
In 2025, the Indiana, PA metro area recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 122.
Is air quality in Indiana, PA getting better or worse? ▼
Air quality in the Indiana, PA metro is worsening based on 5-year trends (2020-2025). Best year: 2020 with 320 good days. Worst year: 2025 with 143 good days.
What does AQI 42 mean for health? ▼
An AQI of 42 is "Good", air quality is satisfactory and poses little or no health risk. This is the best category on the EPA's AQI scale.
What is the 90th percentile AQI for Indiana, PA? ▼
The 90th percentile AQI for the Indiana, PA metro area is 61, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 122 (USG).
How does Indiana, PA compare to other metro areas? ▼
The Indiana, PA metro has 67.5% good air days. Similar metros: Albany-Schenectady-Troy, NY (66.3% good), Bismarck, ND (75.8% good), Bloomington, IN (70.1% good).

Data Sources

Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset, 2020–2025. 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 files (metro-level) · 2020–2025

Every figure on PlainAir 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.