EnviroNearby

Manati, Puerto Rico air quality history

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

100%
Good days in 2005
17
Median daily AQI, 2005
0
Days above 100 in 2005
19
Days with an AQI in 2005 (of 365)

In 2005, EPA reported a daily Air Quality Index (AQI) for Manati, Puerto Rico on 19 days. 19 of those days (100%) were in the Good range, and the median daily AQI was 17. 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 19 days.

EPA did not report an AQI for every day of 2005 here (19 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 43 of 49 days1990: Moderate 6 of 49 days19901991: Good 44 of 46 days1991: Moderate 2 of 46 days1992: Good 57 of 61 days1992: Moderate 4 of 61 days19921993: Good 52 of 59 days1993: Moderate 7 of 59 days1994: Good 49 of 54 days1994: Moderate 5 of 54 days19941995: Good 51 of 52 days1995: Moderate 1 of 52 days1996: Good 50 of 51 days1996: Moderate 1 of 51 days19961997: Good 46 of 52 days1997: Moderate 6 of 52 days1998: Good 56 of 56 days19981999: Good 52 of 55 days1999: Moderate 3 of 55 days2000: Good 51 of 54 days2000: Moderate 3 of 54 days20002001: Good 60 of 61 days2001: Moderate 1 of 61 days2002: Good 59 of 61 days2002: Moderate 2 of 61 days20022003: Good 54 of 58 days2003: Moderate 4 of 58 days2004: Good 56 of 60 days2004: Moderate 4 of 60 days20042005: Good 19 of 19 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 521991: 90th percentile AQI 341992: 90th percentile AQI 441993: 90th percentile AQI 551994: 90th percentile AQI 491995: 90th percentile AQI 311996: 90th percentile AQI 331997: 90th percentile AQI 581998: 90th percentile AQI 351999: 90th percentile AQI 422000: 90th percentile AQI 372001: 90th percentile AQI 342002: 90th percentile AQI 382003: 90th percentile AQI 422004: 90th percentile AQI 352005: 90th percentile AQI 361990: Median AQI 221991: Median AQI 191992: Median AQI 191993: Median AQI 311994: Median AQI 251995: Median AQI 181996: Median AQI 191997: Median AQI 231998: Median AQI 191999: Median AQI 222000: Median AQI 192001: Median AQI 192002: Median AQI 192003: Median AQI 192004: Median AQI 162005: Median AQI 17199019921994199619982000200220042005
  • 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)19100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2005191900000173639PM10
2004605640000163560PM10
2003585440000194267PM10
2002615920000193860PM10
2001616010000193452PM10
2000545130000193769PM10
1999555230000224252PM10
1998565600000193547PM10
1997524660000235891PM10
1996515010000193391PM10
1995525110000183153PM10
1994544950000254966PM10
1993595270000315565PM10
1992615740000194469PM10
1991464420000193475PM10
1990494360000225260PM10

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