Metro area air quality · 2025
Altoona, PA
Median AQI 40 (Good). 76.9% of monitored days rated Good across this metro's EPA monitoring network.
- 40
- Median AQI
- 76.9%
- Good-air days
- 0
- Unhealthy days
- 60%
- Cleaner than US metros
Altoona, PA posted a 2025 median AQI of 40 (Good) with 76.9% Good days
According to the U.S. EPA Air Quality System, the Altoona, PA CBSA recorded a median AQI of 40 across 363 monitored days in 2025, with 76.9% 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 Altoona, PA CBSA's 76.9% Good-day share places it cleaner than 60% of US metros in 2025.
- Closest median-AQI peer
- Beaver Dam, WI (72.3% Good, median AQI 40) is the closest nationwide median-AQI peer to Altoona, PA.
- 2020–2025 Good-day shift
- Altoona, PA's Good-day share moved +4.3 points from 2020 to 2025 (median AQI -3).
- Median AQI
- Median AQI: 40
Aggregated from EPA Air Quality System (2025), 363 monitored days. EPA AQS →
The verdict
Altoona, PA's Good-day share (76.9%) sits in the middle CBSA tercile on this extract. On the EPA scale the metro runs good, cleaner than the median US metro, with a median AQI of 40 and 76.9% of 363 monitored days in the Good band.
- 40
- median AQI · Good
- 76.9%
- days rated Good
- 60%
- cleaner than US metros
- 115
- 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
- Altoona, PA metro's Good-day share fell from 80.9% to 77.1% between the 2024 and 2025 EPA annual releases, a change of -3.8 percentage points.
- Altoona, PA metro's peak single-day AQI rose from 100 to 115 between the 2024 and 2025 EPA annual releases, a change of +15 points.
- Altoona, PA metro's median AQI rose from 37 to 40 between the 2024 and 2025 EPA annual releases, a change of +3 points.
Altoona, PA's Good-day share (76.9%) sits in the middle CBSA tercile on this extract. Signature read: 76.9% Good-day share (mid tercile vs CBSA corpus). Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 40 over 363 measured days in 2025 (Good / Good). The monitored-day split lands at 279 Good (77%), 83 Moderate (23%), and 1 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 60; the highest single-day reading hit 115 (USG).
Across 2020–2025, Good-day share shifted +4.3 points and median AQI moved -3 (improving). No Unhealthy-tier days appear in this annual dataset. Metros with comparable AQI profiles include Beaver Dam, WI (72.3% good, AQI 40); Bismarck, ND (76.7% good, AQI 40); Cape Coral-Fort Myers, FL (76.4% good, AQI 40).
Air Quality Summary
Median AQI
40
Good
Good Days
76.9%
279 of 363 days
Max AQI
115
USG
Health Grade
Good
90th pct: 60
AQI Day Breakdown (2025)
Distribution of 363 monitored days across EPA AQI categories.
Good
279
77%
Moderate
83
23%
USG
1
0%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Health Impact Assessment
The Altoona, PA metro area's air quality is rated Good based on 76.9% 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 Altoona, PA metro compare?
How Altoona, PA compares
5-Year Air Quality Trend
Air quality is improving in the Altoona, PA metro. Highest Good-day share: 2024 (80.9%, 296 of 366 monitored days).
| Year | Good | Moderate | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|
| 2020 | 262 | 98 | 0 | 43 | 87 |
| 2021 | 206 | 128 | 0 | 45 | 120 |
| 2022 | 234 | 129 | 0 | 44 | 97 |
| 2023 | 229 | 123 | 4 | 43 | 213 |
| 2024 | 296 | 70 | 0 | 37 | 100 |
| 2025 | 279 | 83 | 0 | 40 | 115 |
Metros with a similar median AQI
CBSA peers nationwide whose annual median AQI sits near Altoona, PA (40).
Beaver Dam, WI
Median AQI 40 · 72.3% Good-day share
Bismarck, ND
Median AQI 40 · 76.7% Good-day share
Cape Coral-Fort Myers, FL
Median AQI 40 · 76.4% Good-day share
College Station-Bryan, TX
Median AQI 40 · 68.5% Good-day share
Fallon, NV
Median AQI 40 · 85.2% Good-day share
Fayetteville-Springdale-Rogers, AR-MO
Median AQI 40 · 83.3% Good-day share
Metros with similar unhealthy-day exposure
A second relationship type: metros whose unhealthy-or-worse day count is closest to Altoona, PA's 0 (independent of median AQI).
Aberdeen, SD
0 unhealthy-or-worse days · median AQI 27
Aberdeen, WA
0 unhealthy-or-worse days · median AQI 22
Adrian, MI
0 unhealthy-or-worse days · median AQI 41
Akron, OH
0 unhealthy-or-worse days · median AQI 45
Albany, GA
0 unhealthy-or-worse days · median AQI 46
Albany, OR
0 unhealthy-or-worse days · median AQI 27
Frequently Asked Questions
How many unhealthy air days does Altoona, PA have? ▼
What is the air quality in the Altoona, PA metro area? ▼
Is air quality in Altoona, PA getting better or worse? ▼
What does AQI 40 mean for health? ▼
How does Altoona, PA compare to other metro areas? ▼
What is the 90th percentile AQI for Altoona, PA? ▼
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset for Altoona, PA, 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, Altoona, PA · 2020–2025