EnviroNearby

Fajardo, Puerto Rico air quality history

Daily Air Quality Index summaries from EPA monitors in Fajardo, Puerto Rico, 1989–2025.

91%
Good days in 2016
24
Median daily AQI, 2016
1
Days above 100 in 2016
242
Days with an AQI in 2016 (of 366)

In 2016, EPA reported a daily Air Quality Index (AQI) for Fajardo, Puerto Rico on 242 days. 221 of those days (91%) were in the Good range, and the median daily AQI was 24. That median is about the same as the typical monitored county in Puerto Rico (median 23 across 7 counties), and lower than the typical monitored U.S. county (41). The main pollutant was coarse particles (PM10) on 162 days. Across the years with fuller monitoring, the share of Good days held roughly steady: an average of 90% in 1997–1999 versus 92% in 2014–2016.

EPA did not report an AQI for every day of 2016 here (242 of 366 days). Figures describe monitored days only; seasonal monitoring (for example, ozone measured only in warmer months) can make a county look cleaner or dirtier than a full-year record would.

Years with fewer than 120 monitored days (2020, 2021, 2022, 2023, 2024, 2025…) are shown in the table but left out of comparisons and trend statements.

How the days broke down each year

Each bar is one year. The colored segments show the share of monitored days that fell in each AQI category.

Share of monitored days in each AQI category, by year0%25%50%75%100%1989: Good 25 of 27 days1989: Moderate 2 of 27 days19891990: Good 20 of 20 days1991: Good 31 of 32 days1991: Moderate 1 of 32 days1992: Good 51 of 55 days1992: Moderate 4 of 55 days1993: Good 56 of 59 days1993: Moderate 3 of 59 days1994: Good 47 of 51 days1994: Moderate 4 of 51 days19941995: Good 47 of 48 days1995: Moderate 1 of 48 days1996: Good 53 of 54 days1996: Moderate 1 of 54 days1997: Good 134 of 142 days1997: Moderate 8 of 142 days1998: Good 222 of 233 days1998: Moderate 11 of 233 days1999: Good 175 of 217 days1999: Moderate 42 of 217 days19992000: Good 302 of 330 days2000: Moderate 28 of 330 days2001: Good 314 of 349 days2001: Moderate 35 of 349 days2002: Good 326 of 360 days2002: Moderate 34 of 360 days2003: Good 325 of 348 days2003: Moderate 23 of 348 days2004: Good 322 of 344 days2004: Moderate 22 of 344 days20042005: Good 314 of 349 days2005: Moderate 35 of 349 days2006: Good 317 of 351 days2006: Moderate 34 of 351 days2007: Good 313 of 352 days2007: Moderate 38 of 352 days2007: Unhealthy for Sensitive Groups 1 of 352 days2008: Good 282 of 299 days2008: Moderate 17 of 299 days2009: Good 173 of 183 days2009: Moderate 10 of 183 days20092010: Good 325 of 352 days2010: Moderate 27 of 352 days2011: Good 320 of 329 days2011: Moderate 9 of 329 days2012: Good 309 of 335 days2012: Moderate 26 of 335 days2013: Good 321 of 324 days2013: Moderate 3 of 324 days2014: Good 282 of 303 days2014: Moderate 21 of 303 days20142015: Good 299 of 322 days2015: Moderate 23 of 322 days2016: Good 221 of 242 days2016: Moderate 20 of 242 days2016: Unhealthy for Sensitive Groups 1 of 242 days2017: Good 32 of 44 days2017: Moderate 10 of 44 days2017: Unhealthy for Sensitive Groups 2 of 44 days2018: Good 22 of 24 days2018: Moderate 2 of 24 days2019: Good 93 of 119 days2019: Moderate 26 of 119 days20192020: Good 44 of 52 days2020: Moderate 8 of 52 days2021: Good 88 of 114 days2021: Moderate 26 of 114 days2022: Good 73 of 84 days2022: Moderate 11 of 84 days2023: Good 88 of 108 days2023: Moderate 20 of 108 days2024: Good 88 of 106 days2024: Moderate 18 of 106 days20242025: Good 98 of 115 days2025: Moderate 17 of 115 days2025
  • Good
  • Moderate
  • Unhealthy for Sensitive Groups
  • Unhealthy
  • Very Unhealthy
  • Hazardous

Typical and high-end AQI over time

The median is the middle day of the year. The 90th percentile is the level that only the highest 10% of days exceeded.

Median and 90th-percentile daily AQI, by year0501001989: 90th percentile AQI 431990: 90th percentile AQI 441991: 90th percentile AQI 441992: 90th percentile AQI 431993: 90th percentile AQI 451994: 90th percentile AQI 321995: 90th percentile AQI 331996: 90th percentile AQI 351997: 90th percentile AQI 351998: 90th percentile AQI 421999: 90th percentile AQI 582000: 90th percentile AQI 482001: 90th percentile AQI 512002: 90th percentile AQI 502003: 90th percentile AQI 442004: 90th percentile AQI 442005: 90th percentile AQI 512006: 90th percentile AQI 502007: 90th percentile AQI 512008: 90th percentile AQI 432009: 90th percentile AQI 392010: 90th percentile AQI 402011: 90th percentile AQI 342012: 90th percentile AQI 482013: 90th percentile AQI 322014: 90th percentile AQI 402015: 90th percentile AQI 452016: 90th percentile AQI 462017: 90th percentile AQI 732018: 90th percentile AQI 392019: 90th percentile AQI 582020: 90th percentile AQI 572021: 90th percentile AQI 582022: 90th percentile AQI 562023: 90th percentile AQI 612024: 90th percentile AQI 562025: 90th percentile AQI 571989: Median AQI 161990: Median AQI 181991: Median AQI 241992: Median AQI 191993: Median AQI 211994: Median AQI 201995: Median AQI 171996: Median AQI 201997: Median AQI 171998: Median AQI 181999: Median AQI 222000: Median AQI 232001: Median AQI 252002: Median AQI 242003: Median AQI 222004: Median AQI 202005: Median AQI 222006: Median AQI 242007: Median AQI 222008: Median AQI 222009: Median AQI 182010: Median AQI 192011: Median AQI 192012: Median AQI 212013: Median AQI 192014: Median AQI 192015: Median AQI 222016: Median AQI 242017: Median AQI 372018: Median AQI 262019: Median AQI 292020: Median AQI 272021: Median AQI 292022: Median AQI 252023: Median AQI 302024: Median AQI 282025: Median AQI 29198919941999200420092014201920242025
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2016

On each monitored day, the AQI reflects whichever measured pollutant had the highest index. This counts how many days each pollutant set the AQI. A pollutant that was not measured here cannot appear.

PollutantDays as main pollutantShare of monitored days
Coarse particles (PM10)16267%
Fine particles (PM2.5)8033%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
202511598170000295782PM2.5
202410688180000285684PM2.5
202310888200000306172PM2.5
20228473110000255678PM2.5
202111488260000295882PM2.5
2020524480000275782PM2.5
201911993260000295885PM2.5
2018242220000263954PM2.5
201744321020003773108PM2.5
20162422212010002446127PM10
2015322299230000224568PM10
2014303282210000194063PM10
201332432130000193252PM10
2012335309260000214869PM10
201132932090000193462PM10
2010352325270000194085PM10
2009183173100000183981PM10
2008299282170000224383PM10
20073523133810002251121PM10
2006351317340000245081PM2.5
2005349314350000225184PM2.5
2004344322220000204464PM10
2003348325230000224470PM2.5
2002360326340000245064PM2.5
2001349314350000255170PM2.5
2000330302280000234879PM2.5
1999217175420000225871PM2.5
1998233222110000184297PM10
199714213480000173583PM10
1996545310000203593PM10
1995484710000173355PM10
1994514740000203261PM10
1993595630000214562PM10
1992555140000194370PM10
1991323110000244480PM10
1990202000000184446PM10
1989272520000164359PM10

What this data can and can’t tell you

It is a county-level summary. EPA reports one AQI per day for the county, based on the monitors operating there. Air at a particular street, school or home can differ, especially near roads, industry or wildfire smoke.

It is not a health assessment. The AQI is EPA’s scale for communicating daily air quality. A county’s history can’t tell you what the health risk is for any particular person. For daily conditions and health guidance, see AirNow.

Rules change over time. EPA has revised AQI breakpoints, most recently for fine particles in 2024, so some year-to-year change can reflect the scale rather than the air.

All monitored counties in Puerto Rico

Source: U.S. EPA AirData, “Annual AQI by County” files for 1989–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem