EnviroNearby

Marengo County, Alabama air quality history

Daily Air Quality Index summaries from EPA monitors in Marengo, Alabama, 1989–2006.

100%
Good days in 2006
19
Median daily AQI, 2006
0
Days above 100 in 2006
16
Days with an AQI in 2006 (of 365)

In 2006, EPA reported a daily Air Quality Index (AQI) for Marengo, Alabama on 16 days. 16 of those days (100%) were in the Good range, and the median daily AQI was 19. That median is lower than the typical monitored county in Alabama (median 49 across 19 counties), and lower than the typical monitored U.S. county (44). The main pollutant was coarse particles (PM10) on 16 days.

EPA did not report an AQI for every day of 2006 here (16 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 2006; EPA's files for 2007–2025 contain no row for it, which usually means its monitors stopped reporting.

Years with fewer than 120 monitored days (2001, 2002, 2003, 2004, 2005, 2006…) 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 44 of 45 days1989: Moderate 1 of 45 days19891990: Good 55 of 59 days1990: Moderate 4 of 59 days1991: Good 55 of 55 days19911992: Good 51 of 51 days1993: Good 57 of 59 days1993: Moderate 2 of 59 days19931994: Good 60 of 60 days1995: Good 40 of 40 days19951996: Good 59 of 60 days1996: Moderate 1 of 60 days1997: Good 56 of 57 days1997: Moderate 1 of 57 days19971998: Good 55 of 55 days1999: Good 52 of 54 days1999: Moderate 2 of 54 days19992000: Good 57 of 57 days2001: Good 60 of 60 days20012002: Good 57 of 58 days2002: Moderate 1 of 58 days2003: Good 36 of 36 days20032004: Good 56 of 56 days2005: Good 49 of 49 days20052006: Good 16 of 16 days2006
  • 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 371990: 90th percentile AQI 471991: 90th percentile AQI 411992: 90th percentile AQI 331993: 90th percentile AQI 351994: 90th percentile AQI 371995: 90th percentile AQI 311996: 90th percentile AQI 321997: 90th percentile AQI 341998: 90th percentile AQI 371999: 90th percentile AQI 412000: 90th percentile AQI 312001: 90th percentile AQI 362002: 90th percentile AQI 322003: 90th percentile AQI 302004: 90th percentile AQI 312005: 90th percentile AQI 322006: 90th percentile AQI 261989: Median AQI 221990: Median AQI 201991: Median AQI 221992: Median AQI 211993: Median AQI 221994: Median AQI 221995: Median AQI 201996: Median AQI 191997: Median AQI 201998: Median AQI 251999: Median AQI 262000: Median AQI 212001: Median AQI 192002: Median AQI 172003: Median AQI 192004: Median AQI 172005: Median AQI 192006: Median AQI 191989199119931995199719992001200320052006
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2006

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)16100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2006161600000192631PM10
2005494900000193249PM10
2004565600000173139PM10
2003363600000193036PM10
2002585710000173253PM10
2001606000000193649PM10
2000575700000213149PM10
1999545220000264151PM10
1998555500000253747PM10
1997575610000203452PM10
1996605910000193251PM10
1995404000000203147PM10
1994606000000223743PM10
1993595720000223551PM10
1992515100000213343PM10
1991555500000224150PM10
1990595540000204767PM10
1989454410000223752PM10

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.

Counties in Alabama with a similar median AQI in 2006

All monitored counties in Alabama

Source: U.S. EPA AirData, “Annual AQI by County” files for 1989–2006 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem