Metro area air quality · 2025
Guayama, PR
Median AQI 19 (Good). 98.0% of monitored days rated Good across this metro's EPA monitoring network.
- 19
- Median AQI
- 98.0%
- Good-air days
- 0
- Unhealthy days
Guayama, PR posted a 2025 median AQI of 19 (Good) with 98.0% Good days
According to the U.S. EPA Air Quality System, the Guayama, PR CBSA recorded a median AQI of 19 across 50 monitored days in 2025, with 98.0% rated Good and 0 unhealthy or worse. This is an annual metro comparison, not a live advisory.
Data source EPA Air Quality System (AQS)
- Closest median-AQI peer
- Marquette, MI (82.4% Good, median AQI 19) is the closest nationwide median-AQI peer to Guayama, PR.
- 2020–2025 Good-day shift
- Guayama, PR's Good-day share moved +21.5 points from 2020 to 2025 (median AQI -12).
- Median AQI
- Median AQI: 19
- Good days
- Good days: 98.0%
Aggregated from EPA Air Quality System (2025), 50 monitored days. EPA AQS →
The verdict
The Guayama, PR metro runs good on the EPA scale, a median AQI of 19 with 98.0% of 50 monitored days in the Good band.
- 19
- median AQI · Good
- 98.0%
- days rated Good
- 52
- worst single reading
No day crossed into the Unhealthy tier across the metro's monitors in 2025.
Insights: Guayama, PR metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 19 over 50 measured days in 2025, which corresponds to a Good band and a Excellent metro-wide health grade. The monitored-day split lands at 49 Good days (98%), 1 Moderate (2%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 37 while the highest single-day reading hit 52 (Moderate). Metro residents averaged roughly 29.4 clean-air days per 30-day window across the reporting year.
Across the 2020–2025 trend window, the share of monitored days rated Good shifted by +21.5 points (measured against 34 monitored days in 2020 and 50 in 2025, so raw day counts are not comparable) and the median AQI moved -12 points, which classifies the multi-year trajectory as tracked. The metro recorded no Unhealthy-tier days in this annual dataset. Metros with comparable AQI profiles include Marquette, MI (82.4% good, AQI 19); Centralia, WA (91.3% good, AQI 20); Pierre, SD (93.0% good, AQI 18).
Air Quality Summary
Median AQI
19
Good
Good Days
98.0%
49 of 50 days
Max AQI
52
Moderate
Health Grade
Excellent
90th pct: 37
AQI Day Breakdown (2025)
Distribution of 50 monitored days across EPA AQI categories.
Good
49
98%
Moderate
1
2%
USG
0
0%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Health Impact Assessment
The Guayama, PR metro area's air quality is rated Excellent based on 98.0% 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 Guayama, PR metro compare?
How Guayama, PR compares
5-Year Air Quality Trend
Air quality is being tracked in the Guayama, PR metro.
| Year | Good | Moderate | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|
| 2020 | 26 | 8 | 0 | 31 | 82 |
| 2021 | 39 | 15 | 0 | 28 | 77 |
| 2022 | 65 | 2 | 0 | 16 | 67 |
| 2023 | 57 | 2 | 0 | 15 | 55 |
| 2024 | 51 | 1 | 0 | 15 | 53 |
| 2025 | 49 | 1 | 0 | 19 | 52 |
Metros with a similar median AQI
CBSA peers nationwide whose annual median AQI sits near Guayama, PR (19).
Marquette, MI
Median AQI 19 · 82.4% Good-day share
Centralia, WA
Median AQI 20 · 91.3% Good-day share
Pierre, SD
Median AQI 18 · 93.0% Good-day share
Deming, NM
Median AQI 17 · 84.7% Good-day share
Hailey, ID
Median AQI 17 · 96.6% Good-day share
Kahului-Wailuku-Lahaina, HI
Median AQI 21 · 98.1% Good-day share
Metros with similar unhealthy-day exposure
A second relationship type: metros whose unhealthy-or-worse day count is closest to Guayama, 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
More Air Quality Data
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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 Guayama, PR metro area? ▼
How many unhealthy air days does Guayama, PR have? ▼
Is air quality in Guayama, PR getting better or worse? ▼
What does AQI 19 mean for health? ▼
What is the 90th percentile AQI for Guayama, PR? ▼
How does Guayama, PR compare to other metro areas? ▼
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
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Every figure on PlainAirData 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.