Caguas, Puerto Rico Air Quality
Caguas County, Puerto Rico (PR)
↓ Improvingover 8 years
How Caguas, Puerto Rico Air Quality Compares
Caguas, Puerto Rico's median AQI of 6is 85% better than the national average of 41. Air quality has improved by 19 AQI points over the past decade. The area averages 1 unhealthy air days per year. The primary pollutant of concern is Nitrogen Dioxide.
Caguas, Puerto Rico Air Quality: The Full Picture
Caguas, Puerto Rico (Caguas County) holds an AirHistory Air Quality Grade of A (excellent, scoring 97 out of 100), built from 8 years of EPA Air Quality System monitoring. Its median AQI fell 19 points between 2016 (25) and 2023 (6), and the five-year median now sits at 10 — inside the "Good" band on the EPA scale.
The pollutant driving most of the area's AQI readings is Nitrogen Dioxide. In 2023, it set the daily AQI on 33 of 256 monitored days (13% of the year), making it the controlling pollutant for the A grade. The single worst reading logged that year hit an AQI of 105 (Unhealthy for Sensitive Groups), while the 90th-percentile day — the level the dirtiest 10% of days reach — came in at 34.
In 2023, Caguas County recorded 242 "Good" air days (95% of the 256 days with valid AQI data), 13 "Moderate" days, and 1 days at "Unhealthy for Sensitive Groups" or above. Over the most recent five years on record, monitors logged 5 days that crossed into "Unhealthy for Sensitive Groups" or worse — about 1 per year.
The decade-long trend is improving: median AQI has been dropping by roughly 2.30 points per year. The cleanest year in the record was 2023 (median AQI 6), and the most polluted was 2016 (median AQI 25). 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 | 6 | 34 | 105 | 242 | 13 | 1 | CO |
| 2022 | 9 | 32 | 76 | 291 | 16 | 0 | NO2 |
| 2021 | 14 | 48 | 75 | 180 | 17 | 0 | CO |
| 2020 | 10 | 27 | 72 | 306 | 12 | 0 | CO |
| 2019 | 10 | 47 | 114 | 322 | 28 | 4 | NO2 |
| 2018 | 9 | 23 | 54 | 199 | 2 | 0 | CO |
| 2017 | 24 | 47 | 101 | 209 | 16 | 1 | NO2 |
| 2016 | 25 | 52 | 112 | 9 | 1 | 1 | NO2 |
What This Means for Caguas County Residents
Caguas, Puerto Rico has received an Air Quality Grade of A (97/100) based on a decade of monitoring data from the EPA's air quality monitoring program. The current median AQI of 6 falls in the "Good" range.
Encouragingly, air quality here has been improving, with the median AQI dropping by 19 points over the monitoring period. This trend suggests continued investment in emission controls and cleaner energy.
The primary pollutant affecting this area is Nitrogen Dioxide. Over the past 5 years, this area has averaged 1 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
Caguas, Puerto Rico has a current median AQI of 6, which falls in the "Good" range. The area has received an Air Quality Grade of A (97/100) based on 10 years of EPA monitoring data.
Air quality in Caguas, Puerto Rico is improving over the past decade. The median AQI has changed by -19 points from 2016 to 2023.
Caguas, Puerto Rico averages 1 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 Caguas, Puerto Rico is Nitrogen Dioxide. This is the dominant contributor to elevated AQI readings in the Caguas County area.
Caguas, Puerto Rico averages 1 unhealthy air days per year. This is relatively low, making it a reasonable choice for asthma sufferers. The primary pollutant is Nitrogen Dioxide, which can affect respiratory health.
With a median AQI of 6 (Good), outdoor exercise in Caguas, Puerto Rico is generally safe year-round. Caguas, Puerto Rico averages 1 days per year when athletes should move workouts indoors.