Metro area air quality · 2025
Ponce, PR
Median AQI 3 (Good). 91.4% of monitored days rated Good across this metro's EPA monitoring network.
- 3
- Median AQI
- 91.4%
- Good-air days
- 0
- Unhealthy days
- 89%
- Cleaner than US metros
Ponce, PR posted a 2025 median AQI of 3 (Good) with 91.4% Good days
According to the U.S. EPA Air Quality System, the Ponce, PR CBSA recorded a median AQI of 3 across 257 monitored days in 2025, with 91.4% 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 Ponce, PR CBSA's 91.4% Good-day share places it cleaner than 89% of US metros in 2025.
- Closest median-AQI peer
- Evanston, WY (100.0% Good, median AQI 9) is the closest nationwide median-AQI peer to Ponce, PR.
- 2020–2025 Good-day shift
- Ponce, PR's Good-day share moved +2.8 points from 2020 to 2025 (median AQI -20).
- Median AQI
- Median AQI: 3
Aggregated from EPA Air Quality System (2025), 257 monitored days. EPA AQS →
The verdict
Ponce, PR sits in the upper Good-day tercile among EPA CBSA metros on this site (91.4% of 257 monitored days). On the EPA scale the metro runs good, cleaner than most US metros, with a median AQI of 3 and 91.4% of 257 monitored days in the Good band.
- 3
- median AQI · Good
- 91.4%
- days rated Good
- 89%
- cleaner than US metros
- 74
- 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
- Ponce, PR metro's Good-day share fell from 94.3% to 91.4% between the 2024 and 2025 EPA annual releases, a change of -2.9 percentage points.
Ponce, PR sits in the upper Good-day tercile among EPA CBSA metros on this site (91.4% of 257 monitored days). Signature read: 91.4% Good-day share (high tercile vs CBSA corpus). Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 3 over 257 measured days in 2025 (Good / Excellent). The monitored-day split lands at 235 Good (91%), 22 Moderate (9%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 42; the highest single-day reading hit 74 (Moderate).
Across 2020–2025, Good-day share shifted +2.8 points and median AQI moved -20 (improving). No Unhealthy-tier days appear in this annual dataset. Metros with comparable AQI profiles include Evanston, WY (100.0% good, AQI 9); Mayaguez, PR (97.8% good, AQI 9); Santa Rosa, CA (100.0% good, AQI 9).
Air Quality Summary
Median AQI
3
Good
Good Days
91.4%
235 of 257 days
Max AQI
74
Moderate
Health Grade
Excellent
90th pct: 42
AQI Day Breakdown (2025)
Distribution of 257 monitored days across EPA AQI categories.
Good
235
91%
Moderate
22
9%
USG
0
0%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Health Impact Assessment
The Ponce, PR metro area's air quality is rated Excellent based on 91.4% 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 Ponce, PR metro compare?
How Ponce, PR compares
5-Year Air Quality Trend
Air quality is improving in the Ponce, PR metro. Highest Good-day share: 2024 (94.3%, 317 of 336 monitored days).
| Year | Good | Moderate | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|
| 2020 | 319 | 41 | 0 | 23 | 81 |
| 2021 | 176 | 37 | 1 | 30 | 380 |
| 2022 | 264 | 31 | 0 | 18 | 99 |
| 2023 | 258 | 82 | 0 | 30 | 83 |
| 2024 | 317 | 19 | 0 | 3 | 82 |
| 2025 | 235 | 22 | 0 | 3 | 74 |
Metros with a similar median AQI
CBSA peers nationwide whose annual median AQI sits near Ponce, PR (3).
Evanston, WY
Median AQI 9 · 100.0% Good-day share
Mayaguez, PR
Median AQI 9 · 97.8% Good-day share
Santa Rosa, CA
Median AQI 9 · 100.0% Good-day share
Bozeman, MT
Median AQI 11 · 98.1% Good-day share
Show Low, AZ
Median AQI 13 · 99.5% Good-day share
Havre, MT
Median AQI 14 · 92.1% Good-day share
Metros with similar unhealthy-day exposure
A second relationship type: metros whose unhealthy-or-worse day count is closest to Ponce, PR'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 Ponce, PR have? ▼
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What does AQI 3 mean for health? ▼
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What is the 90th percentile AQI for Ponce, PR? ▼
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset for Ponce, PR, 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, Ponce, PR · 2020–2025