EnviroNearby

Barceloneta, Puerto Rico air quality history

Daily Air Quality Index summaries from EPA monitors in Barceloneta, Puerto Rico, 1990–2005.

100%
Good days in 2005
15
Median daily AQI, 2005
0
Days above 100 in 2005
18
Days with an AQI in 2005 (of 365)

In 2005, EPA reported a daily Air Quality Index (AQI) for Barceloneta, Puerto Rico on 18 days. 18 of those days (100%) were in the Good range, and the median daily AQI was 15. That median is lower than the typical monitored county in Puerto Rico (median 31.5 across 4 counties), and lower than the typical monitored U.S. county (44). The main pollutant was coarse particles (PM10) on 18 days.

EPA did not report an AQI for every day of 2005 here (18 of 365 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.

The most recent year with data for this county is 2005; EPA's files for 2006–2025 contain no row for it, which usually means its monitors stopped reporting.

Years with fewer than 120 monitored days (2000, 2001, 2002, 2003, 2004, 2005…) 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%1990: Good 42 of 49 days1990: Moderate 7 of 49 days19901991: Good 45 of 49 days1991: Moderate 4 of 49 days1992: Good 55 of 58 days1992: Moderate 3 of 58 days19921993: Good 59 of 60 days1993: Moderate 1 of 60 days1994: Good 49 of 55 days1994: Moderate 6 of 55 days19941995: Good 53 of 55 days1995: Moderate 2 of 55 days1996: Good 51 of 52 days1996: Moderate 1 of 52 days19961997: Good 46 of 51 days1997: Moderate 5 of 51 days1998: Good 47 of 47 days19981999: Good 49 of 49 days2000: Good 43 of 46 days2000: Moderate 3 of 46 days20002001: Good 52 of 53 days2001: Moderate 1 of 53 days2002: Good 48 of 50 days2002: Moderate 2 of 50 days20022003: Good 49 of 53 days2003: Moderate 4 of 53 days2004: Good 52 of 56 days2004: Moderate 4 of 56 days20042005: Good 18 of 18 days2005
  • 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 year0501001990: 90th percentile AQI 541991: 90th percentile AQI 401992: 90th percentile AQI 451993: 90th percentile AQI 441994: 90th percentile AQI 511995: 90th percentile AQI 271996: 90th percentile AQI 341997: 90th percentile AQI 491998: 90th percentile AQI 311999: 90th percentile AQI 392000: 90th percentile AQI 432001: 90th percentile AQI 292002: 90th percentile AQI 312003: 90th percentile AQI 362004: 90th percentile AQI 362005: 90th percentile AQI 321990: Median AQI 221991: Median AQI 211992: Median AQI 181993: Median AQI 191994: Median AQI 191995: Median AQI 181996: Median AQI 191997: Median AQI 231998: Median AQI 171999: Median AQI 182000: Median AQI 182001: Median AQI 162002: Median AQI 192003: Median AQI 192004: Median AQI 162005: Median AQI 15199019921994199619982000200220042005
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2005

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)18100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2005181800000153235PM10
2004565240000163659PM10
2003534940000193661PM10
2002504820000193153PM10
2001535210000162952PM10
2000464330000184369PM10
1999494900000183948PM10
1998474700000173142PM10
1997514650000234992PM10
1996525110000193498PM10
1995555320000182756PM10
1994554960000195170PM10
1993605910000194459PM10
1992585530000184566PM10
1991494540000214076PM10
1990494270000225458PM10

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 1990–2005 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem