EnviroNearby

Colbert County, Alabama air quality history

Daily Air Quality Index summaries from EPA monitors in Colbert, Alabama, 1990–2019.

90%
Good days in 2019
38
Median daily AQI, 2019
0
Days above 100 in 2019
263
Days with an AQI in 2019 (of 365)

In 2019, EPA reported a daily Air Quality Index (AQI) for Colbert, Alabama on 263 days. 238 of those days (90%) were in the Good range, and the median daily AQI was 38. That median is lower than the typical monitored county in Alabama (median 42 across 15 counties), and lower than the typical monitored U.S. county (41). The main pollutant was ozone on 219 days. Across the years with fuller monitoring, the share of Good days rose: an average of 69% in 1994–2002 versus 87% in 2017–2019.

EPA did not report an AQI for every day of 2019 here (263 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 2019; EPA's files for 2020–2025 contain no row for it, which usually means its monitors stopped reporting.

Years with fewer than 120 monitored days (1996, 1997, 1998, 1999, 2000, 2001…) 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 56 of 58 days1990: Moderate 2 of 58 days19901991: Good 55 of 57 days1991: Moderate 2 of 57 days1992: Good 58 of 58 days1993: Good 59 of 60 days1993: Moderate 1 of 60 days1994: Good 190 of 285 days1994: Moderate 75 of 285 days1994: Unhealthy for Sensitive Groups 19 of 285 days1994: Unhealthy 1 of 285 days1995: Good 129 of 165 days1995: Moderate 34 of 165 days1995: Unhealthy for Sensitive Groups 2 of 165 days19951996: Good 54 of 54 days1997: Good 59 of 59 days1998: Good 48 of 48 days1999: Good 10 of 82 days1999: Moderate 70 of 82 days1999: Unhealthy for Sensitive Groups 2 of 82 days2000: Good 18 of 106 days2000: Moderate 86 of 106 days2000: Unhealthy for Sensitive Groups 2 of 106 days20002001: Good 36 of 100 days2001: Moderate 64 of 100 days2002: Good 185 of 294 days2002: Moderate 94 of 294 days2002: Unhealthy for Sensitive Groups 12 of 294 days2002: Unhealthy 3 of 294 days2003: Good 197 of 317 days2003: Moderate 113 of 317 days2003: Unhealthy for Sensitive Groups 6 of 317 days2003: Unhealthy 1 of 317 days2004: Good 178 of 276 days2004: Moderate 98 of 276 days2005: Good 149 of 278 days2005: Moderate 119 of 278 days2005: Unhealthy for Sensitive Groups 10 of 278 days20052006: Good 154 of 282 days2006: Moderate 121 of 282 days2006: Unhealthy for Sensitive Groups 7 of 282 days2007: Good 149 of 283 days2007: Moderate 119 of 283 days2007: Unhealthy for Sensitive Groups 15 of 283 days2008: Good 175 of 277 days2008: Moderate 102 of 277 days2009: Good 161 of 323 days2009: Moderate 162 of 323 days2010: Good 124 of 355 days2010: Moderate 230 of 355 days2010: Unhealthy for Sensitive Groups 1 of 355 days20102011: Good 189 of 279 days2011: Moderate 89 of 279 days2011: Unhealthy for Sensitive Groups 1 of 279 days2012: Good 204 of 283 days2012: Moderate 73 of 283 days2012: Unhealthy for Sensitive Groups 6 of 283 days2013: Good 225 of 285 days2013: Moderate 60 of 285 days2014: Good 224 of 284 days2014: Moderate 60 of 284 days2015: Good 221 of 280 days2015: Moderate 59 of 280 days20152016: Good 241 of 282 days2016: Moderate 40 of 282 days2016: Unhealthy for Sensitive Groups 1 of 282 days2017: Good 244 of 283 days2017: Moderate 39 of 283 days2018: Good 235 of 277 days2018: Moderate 42 of 277 days2019: Good 238 of 263 days2019: Moderate 25 of 263 days2019
  • 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 361991: 90th percentile AQI 381992: 90th percentile AQI 311993: 90th percentile AQI 351994: 90th percentile AQI 931995: 90th percentile AQI 711996: 90th percentile AQI 271997: 90th percentile AQI 301998: 90th percentile AQI 321999: 90th percentile AQI 892000: 90th percentile AQI 822001: 90th percentile AQI 782002: 90th percentile AQI 842003: 90th percentile AQI 722004: 90th percentile AQI 672005: 90th percentile AQI 802006: 90th percentile AQI 742007: 90th percentile AQI 902008: 90th percentile AQI 662009: 90th percentile AQI 642010: 90th percentile AQI 702011: 90th percentile AQI 632012: 90th percentile AQI 642013: 90th percentile AQI 562014: 90th percentile AQI 562015: 90th percentile AQI 562016: 90th percentile AQI 522017: 90th percentile AQI 532018: 90th percentile AQI 542019: 90th percentile AQI 501990: Median AQI 191991: Median AQI 201992: Median AQI 191993: Median AQI 211994: Median AQI 421995: Median AQI 351996: Median AQI 141997: Median AQI 161998: Median AQI 201999: Median AQI 642000: Median AQI 632001: Median AQI 552002: Median AQI 442003: Median AQI 462004: Median AQI 452005: Median AQI 492006: Median AQI 482007: Median AQI 492008: Median AQI 452009: Median AQI 512010: Median AQI 542011: Median AQI 442012: Median AQI 432013: Median AQI 402014: Median AQI 392015: Median AQI 392016: Median AQI 412017: Median AQI 392018: Median AQI 372019: Median AQI 381990199520002005201020152019
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2019

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
Ozone21983%
Fine particles (PM2.5)4417%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2019263238250000385065Ozone
2018277235420000375493Ozone
2017283244390000395367Ozone
20162822414010004152115Ozone
2015280221590000395676Ozone
2014284224600000395687Ozone
2013285225600000405680Ozone
20122832047360004364136Ozone
20112791898910004463101Ozone
201035512423010005470105PM2.5
20093231611620000516479PM2.5
20082771751020000456697Ozone
2007283149119150004990122Ozone
200628215412170004874129Ozone
2005278149119100004980126Ozone
2004276178980000456793Ozone
200331719711361004672151Ozone
200229418594123004484166Ozone
200110036640000557890PM2.5
2000106188620006382124PM2.5
199982107020006489123PM2.5
1998484800000203241PM10
1997595900000163041PM10
1996545400000142744PM10
19951651293420003571133Ozone
199428519075191004293185Ozone
1993605910000213551PM10
1992585800000193140PM10
1991575520000203854PM10
1990585620000193662PM10

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 2019

All monitored counties in Alabama

Source: U.S. EPA AirData, “Annual AQI by County” files for 1990–2019 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem