Metro area air quality · 2024

Guayama, PR

Median AQI 15 (Good). 98.1% of monitored days rated Good across this metro's EPA monitoring network.

15
Median AQI
98.1%
Good-air days
0
Unhealthy days
97%
Cleaner than US metros

Aggregated from EPA Air Quality System (2024), 52 monitored days. EPA AQS → · NOAA →

Insights: Guayama, PR metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 15 over 52 measured days in 2024, which corresponds to a Good band and a Excellent metro-wide health grade. The monitored-day split lands at 51 Good days (98%), 1 Moderate (2%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 29 while the highest single-day reading hit 53 (Moderate). Metro residents averaged roughly 29.4 clean-air days per 30-day window across the reporting year.

Across the 2020–2024 trend window, good days shifted by +25 and the median AQI moved -16 points, which classifies the multi-year trajectory as improving. 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 Havre, MT (92.6% good, AQI 15); Los Alamos, NM (100.0% good, AQI 14); Ruidoso, NM (97.4% good, AQI 16).

Air Quality Summary

Median AQI

15

Good

Good Days

98.1%

51 of 52 days

Max AQI

53

Moderate

Health Grade

Excellent

90th pct: 29

AQI Day Breakdown (2024)

Distribution of 52 monitored days across EPA AQI categories.

Good

51

98%

Moderate

1

2%

USG

0

0%

Unhealthy

0

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Excellent

The Guayama, PR metro area's air quality is rated Excellent based on 98.1% good air days. No unhealthy air days were recorded in 2024.

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

Good-day share better than US avg
Guayama, PR 98.1%
Havre, MT 92.6%
US average 70.2%
Median AQI better than US avg
Guayama, PR 15
Havre, MT 15
US average 41
Unhealthy days / yr better than US avg
Guayama, PR 0
Havre, MT 0
US average 1

5-Year Air Quality Trend

Air quality is improving in the Guayama, PR metro. Best year: 2022 (65 good days).

Year Good Moderate Unhealthy Median AQI
2020 26 8 0 31
2021 39 15 0 28
2022 65 2 0 16
2023 57 2 0 15
2024 51 1 0 15

Metros with Similar Air Quality

Metro areas across the US with a similar median AQI to Guayama, PR.

Havre, MT

AQI 15 · 92.6% good

15

Los Alamos, NM

AQI 14 · 100.0% good

14

Ruidoso, NM

AQI 16 · 97.4% good

16

Taos, NM

AQI 16 · 97.0% good

16

Ca¤on City, CO

AQI 13 · 97.8% good

13

Deming, NM

AQI 17 · 93.4% good

17

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

Learn more about air quality monitoring, pollutants, and health impacts.

Understanding AQI

What each AQI level means and who is most at risk.

Best & Worst City Air Quality

Metro area air quality rankings and what drives urban pollution.

Health Effects of Air Pollution

How PM2.5 and ozone exposure affects respiratory and cardiovascular health.

Frequently Asked Questions

What is the air quality in the Guayama, PR metro area? ▼
The Guayama, PR metro area has a median Air Quality Index (AQI) of 15, rated "Good." 98.1% of monitored days (51 out of 52) had good air quality in 2024.
How many unhealthy air days does Guayama, PR have? ▼
In 2024, the Guayama, PR metro area recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 53.
Is air quality in Guayama, PR getting better or worse? ▼
Air quality in the Guayama, PR metro is improving based on 5-year trends (2020-2024). Best year: 2022 with 65 good days. Worst year: 2020 with 26 good days.
What does AQI 15 mean for health? ▼
An AQI of 15 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 Guayama, PR? ▼
The 90th percentile AQI for the Guayama, PR metro area is 29, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 53 (Moderate).
How does Guayama, PR compare to other metro areas? ▼
The Guayama, PR metro has 98.1% good air days. Similar metros: Havre, MT (92.6% good), Los Alamos, NM (100.0% good), Ruidoso, NM (97.4% good).

Data Sources

Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset, 2020–2024. The AQS collects ambient air monitoring data from state, local, and tribal monitoring agencies across the United States.

Metrics: Air Quality Index (AQI) is calculated using EPA-standard breakpoints for six criteria pollutants: PM2.5, PM10, Ozone, NO2, CO, and SO2. Median AQI, max AQI, and 90th percentile AQI are computed from daily measurements. Good days percentage reflects days with AQI 0–50.

Coverage: 501 metro areas (Core Based Statistical Areas). Only metros with active monitoring stations are included. Unmonitored areas are not represented.

Read our methodology , how this data is sourced, computed, and verified.

Source: U.S. EPA, AirNow / AQS Air Quality Index readings and pollutant concentrations · 2025