Guayama, Puerto Rico Air Quality
Guayama County, Puerto Rico (PR)
↓ Improvingover 9 years
How Guayama, Puerto Rico Air Quality Compares
Guayama, Puerto Rico's median AQI of 15is 63% better than the national average of 41. Air quality has improved by 4 AQI points over the past decade. The area rarely experiences unhealthy air quality days. The primary pollutant of concern is Fine Particulate Matter (PM2.5).
Guayama, Puerto Rico Air Quality: The Full Picture
Guayama, Puerto Rico (Guayama County) holds an AirHistory Air Quality Grade of B (good, scoring 78 out of 100), built from 9 years of EPA Air Quality System monitoring. Its median AQI fell 4 points between 2014 (19) and 2023 (15), and the five-year median now sits at 24 — inside the "Good" band on the EPA scale.
The pollutant driving most of the area's AQI readings is Fine Particulate Matter (PM2.5). In 2023, the single worst reading hit an AQI of 55 (Moderate), while the 90th-percentile day — the level the dirtiest 10% of days reach — came in at 37.
In 2023, Guayama County recorded 57 "Good" air days (97% of the 59 days with valid AQI data), 2 "Moderate" days, and 0 days at "Unhealthy for Sensitive Groups" or above. Over the most recent five years on record, monitors logged no days that crossed into "Unhealthy for Sensitive Groups" or worse.
The decade-long trend is improving: median AQI has been dropping by roughly 0.69 points per year. The cleanest year in the record was 2023 (median AQI 15), and the most polluted was 2017 (median AQI 37). Because the data come straight from federally certified EPA monitors, these figures track the Puerto Rico county the monitors physically sit in rather than a city boundary.
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10-Year AQI Trend
The solid line shows the median AQI each year. The dashed line shows the 90th percentile (worst 10% of days). This area has seen measurable air quality improvement over the decade.
Air Quality Day Breakdown
Number of days per year in each EPA AQI category. Green = Good (AQI 0-50), Yellow = Moderate (51-100), Orange = Unhealthy for Sensitive Groups (101-150), Red = Unhealthy or worse (151+).
Year-by-Year Data
| Year | Median AQI | 90th Pct | Max AQI | Good Days | Moderate | Unhealthy+ | Pollutant |
|---|---|---|---|---|---|---|---|
| 2023 | 15 | 37 | 55 | 57 | 2 | 0 | PM10 |
| 2022 | 16 | 31 | 67 | 65 | 2 | 0 | PM10 |
| 2021 | 28 | 65 | 77 | 39 | 15 | 0 | PM2.5 |
| 2020 | 31 | 63 | 82 | 26 | 8 | 0 | PM2.5 |
| 2019 | 29 | 29 | 29 | 2 | 0 | 0 | PM10 |
| 2017 | 37 | 63 | 85 | 36 | 8 | 0 | PM2.5 |
| 2016 | 28 | 58 | 73 | 85 | 17 | 0 | PM2.5 |
| 2015 | 25 | 55 | 68 | 91 | 19 | 0 | PM2.5 |
| 2014 | 19 | 42 | 59 | 98 | 8 | 0 | PM10 |
What This Means for Guayama County Residents
Guayama, Puerto Rico has received an Air Quality Grade of B (78/100) based on a decade of monitoring data from the EPA's air quality monitoring program. The current median AQI of 15 falls in the "Good" range.
Encouragingly, air quality here has been improving, with the median AQI dropping by 4 points over the monitoring period. This trend suggests continued investment in emission controls and cleaner energy.
The primary pollutant affecting this area is Fine Particulate Matter (PM2.5). Over the past 5 years, this area has averaged 0 unhealthy air quality days per year, days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity. The American Lung Association's State of the Air report provides additional context on long-term health risks from air pollution exposure.
Related Cities in Puerto Rico
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Frequently Asked Questions
Guayama, Puerto Rico has a current median AQI of 15, which falls in the "Good" range. The area has received an Air Quality Grade of B (78/100) based on 10 years of EPA monitoring data.
Air quality in Guayama, Puerto Rico is improving over the past decade. The median AQI has changed by -4 points from 2014 to 2023.
Guayama, Puerto Rico averages 0 unhealthy air quality days per year over the past 5 years. On these days, sensitive groups including children, the elderly, and those with respiratory conditions should limit outdoor activity.
The primary pollutant affecting Guayama, Puerto Rico is Fine Particulate Matter (PM2.5). This is the dominant contributor to elevated AQI readings in the Guayama County area.
Guayama, Puerto Rico averages 0 unhealthy air days per year. This is relatively low, making it a reasonable choice for asthma sufferers. The primary pollutant is Fine Particulate Matter (PM2.5), which is a known asthma trigger.
With a median AQI of 15 (Good), outdoor exercise in Guayama, Puerto Rico is generally safe year-round. Guayama, Puerto Rico averages 0 days per year when athletes should move workouts indoors.