Bayamon, Puerto Rico Air Quality
Bayamon County, Puerto Rico (PR)
↓ Improvingover 10 years
How Bayamon, Puerto Rico Air Quality Compares
Bayamon, Puerto Rico's median AQI of 22is 46% better than the national average of 41. Air quality has worsened by 12 AQI points over the past decade. The area rarely experiences unhealthy air quality days. The primary pollutant of concern is Carbon Monoxide.
Bayamon, Puerto Rico Air Quality: The Full Picture
Bayamon, Puerto Rico (Bayamon County) holds an AirHistory Air Quality Grade of A (excellent, scoring 87 out of 100), built from 10 years of EPA Air Quality System monitoring. Its median AQI rose 12 points between 2014 (10) and 2023 (22), and the five-year median now sits at 18 — inside the "Good" band on the EPA scale.
The pollutant driving most of the area's AQI readings is Carbon Monoxide. In 2023, it set the daily AQI on 40 of 216 monitored days (19% of the year), making it the controlling pollutant for the A grade. The single worst reading logged that year hit an AQI of 74 (Moderate), while the 90th-percentile day — the level the dirtiest 10% of days reach — came in at 52.
In 2023, Bayamon County recorded 193 "Good" air days (89% of the 216 days with valid AQI data), 23 "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 0.79 points per year. The cleanest year in the record was 2014 (median AQI 10), and the most polluted was 2017 (median AQI 60). 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 | 22 | 52 | 74 | 193 | 23 | 0 | PM2.5 |
| 2022 | 15 | 33 | 77 | 342 | 16 | 0 | CO |
| 2021 | 10 | 41 | 77 | 320 | 27 | 0 | CO |
| 2020 | 21 | 38 | 69 | 259 | 11 | 0 | CO |
| 2019 | 20 | 53 | 79 | 239 | 39 | 0 | PM2.5 |
| 2018 | 56 | 83 | 172 | 76 | 175 | 13 | PM2.5 |
| 2017 | 60 | 79 | 132 | 46 | 109 | 4 | PM2.5 |
| 2016 | 23 | 53 | 177 | 199 | 66 | 2 | Ozone |
| 2015 | 18 | 50 | 146 | 241 | 25 | 1 | Ozone |
| 2014 | 10 | 22 | 51 | 271 | 1 | 0 | CO |
What This Means for Bayamon County Residents
Bayamon, Puerto Rico has received an Air Quality Grade of A (87/100) based on a decade of monitoring data from the EPA's air quality monitoring program. The current median AQI of 22 falls in the "Good" range.
Encouragingly, air quality here has been improving, with the median AQI dropping by 12 points over the monitoring period. This trend suggests continued investment in emission controls and cleaner energy.
The primary pollutant affecting this area is Carbon Monoxide. 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
Bayamon, Puerto Rico has a current median AQI of 22, which falls in the "Good" range. The area has received an Air Quality Grade of A (87/100) based on 10 years of EPA monitoring data.
Air quality in Bayamon, Puerto Rico is improving over the past decade. The median AQI has changed by +12 points from 2014 to 2023.
Bayamon, 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 Bayamon, Puerto Rico is Carbon Monoxide. This is the dominant contributor to elevated AQI readings in the Bayamon County area.
Bayamon, 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 Carbon Monoxide, which can affect respiratory health.
With a median AQI of 22 (Good), outdoor exercise in Bayamon, Puerto Rico is generally safe year-round. Bayamon, Puerto Rico averages 0 days per year when athletes should move workouts indoors.