EnviroNearby

Douglas County, Nebraska air quality history

Daily Air Quality Index summaries from EPA monitors in Douglas, Nebraska, 1980–2025.

71%
Good days in 2025
42
Median daily AQI, 2025
2
Days above 100 in 2025
365
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Douglas, Nebraska on 365 days. 259 of those days (71%) were in the Good range, and the median daily AQI was 42. That median is higher than the typical monitored county in Nebraska (median 34 across 10 counties), and about the same as the typical monitored U.S. county (40). The main pollutant was ozone on 176 days. Across the years with fuller monitoring, the share of Good days fell: an average of 69% in 1980–1982 versus 64% in 2023–2025.

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%1980: Good 229 of 366 days1980: Moderate 59 of 366 days1980: Unhealthy for Sensitive Groups 39 of 366 days1980: Unhealthy 22 of 366 days1980: Very Unhealthy 17 of 366 days19801981: Good 281 of 365 days1981: Moderate 81 of 365 days1981: Unhealthy for Sensitive Groups 3 of 365 days1982: Good 248 of 365 days1982: Moderate 101 of 365 days1982: Unhealthy for Sensitive Groups 11 of 365 days1982: Unhealthy 3 of 365 days1982: Very Unhealthy 2 of 365 days1983: Good 306 of 365 days1983: Moderate 53 of 365 days1983: Unhealthy for Sensitive Groups 6 of 365 days1984: Good 283 of 366 days1984: Moderate 70 of 366 days1984: Unhealthy for Sensitive Groups 12 of 366 days1984: Unhealthy 1 of 366 days1985: Good 247 of 365 days1985: Moderate 98 of 365 days1985: Unhealthy for Sensitive Groups 18 of 365 days1985: Unhealthy 2 of 365 days19851986: Good 301 of 365 days1986: Moderate 59 of 365 days1986: Unhealthy for Sensitive Groups 5 of 365 days1987: Good 249 of 365 days1987: Moderate 105 of 365 days1987: Unhealthy for Sensitive Groups 11 of 365 days1988: Good 226 of 366 days1988: Moderate 100 of 366 days1988: Unhealthy for Sensitive Groups 35 of 366 days1988: Unhealthy 5 of 366 days1989: Good 241 of 365 days1989: Moderate 114 of 365 days1989: Unhealthy for Sensitive Groups 10 of 365 days1990: Good 270 of 365 days1990: Moderate 87 of 365 days1990: Unhealthy for Sensitive Groups 7 of 365 days1990: Unhealthy 1 of 365 days19901991: Good 273 of 365 days1991: Moderate 88 of 365 days1991: Unhealthy for Sensitive Groups 4 of 365 days1992: Good 290 of 366 days1992: Moderate 73 of 366 days1992: Unhealthy for Sensitive Groups 3 of 366 days1993: Good 334 of 365 days1993: Moderate 31 of 365 days1994: Good 325 of 365 days1994: Moderate 38 of 365 days1994: Unhealthy for Sensitive Groups 2 of 365 days1995: Good 305 of 365 days1995: Moderate 52 of 365 days1995: Unhealthy for Sensitive Groups 8 of 365 days19951996: Good 313 of 366 days1996: Moderate 52 of 366 days1996: Unhealthy 1 of 366 days1997: Good 289 of 365 days1997: Moderate 72 of 365 days1997: Unhealthy for Sensitive Groups 4 of 365 days1998: Good 302 of 365 days1998: Moderate 57 of 365 days1998: Unhealthy for Sensitive Groups 4 of 365 days1998: Unhealthy 2 of 365 days1999: Good 241 of 365 days1999: Moderate 113 of 365 days1999: Unhealthy for Sensitive Groups 9 of 365 days1999: Unhealthy 2 of 365 days2000: Good 134 of 366 days2000: Moderate 223 of 366 days2000: Unhealthy for Sensitive Groups 9 of 366 days20002001: Good 145 of 365 days2001: Moderate 216 of 365 days2001: Unhealthy for Sensitive Groups 4 of 365 days2002: Good 155 of 365 days2002: Moderate 208 of 365 days2002: Unhealthy for Sensitive Groups 2 of 365 days2003: Good 159 of 365 days2003: Moderate 200 of 365 days2003: Unhealthy for Sensitive Groups 5 of 365 days2003: Unhealthy 1 of 365 days2004: Good 166 of 366 days2004: Moderate 194 of 366 days2004: Unhealthy for Sensitive Groups 6 of 366 days2005: Good 126 of 365 days2005: Moderate 227 of 365 days2005: Unhealthy for Sensitive Groups 12 of 365 days20052006: Good 125 of 365 days2006: Moderate 231 of 365 days2006: Unhealthy for Sensitive Groups 9 of 365 days2007: Good 78 of 365 days2007: Moderate 276 of 365 days2007: Unhealthy for Sensitive Groups 11 of 365 days2008: Good 33 of 366 days2008: Moderate 322 of 366 days2008: Unhealthy for Sensitive Groups 11 of 366 days2009: Good 200 of 365 days2009: Moderate 164 of 365 days2009: Unhealthy for Sensitive Groups 1 of 365 days2010: Good 163 of 365 days2010: Moderate 196 of 365 days2010: Unhealthy for Sensitive Groups 6 of 365 days20102011: Good 148 of 365 days2011: Moderate 214 of 365 days2011: Unhealthy for Sensitive Groups 3 of 365 days2012: Good 128 of 366 days2012: Moderate 224 of 366 days2012: Unhealthy for Sensitive Groups 14 of 366 days2013: Good 184 of 365 days2013: Moderate 178 of 365 days2013: Unhealthy for Sensitive Groups 3 of 365 days2014: Good 206 of 365 days2014: Moderate 158 of 365 days2014: Unhealthy for Sensitive Groups 1 of 365 days2015: Good 198 of 365 days2015: Moderate 165 of 365 days2015: Unhealthy for Sensitive Groups 2 of 365 days20152016: Good 225 of 366 days2016: Moderate 139 of 366 days2016: Unhealthy for Sensitive Groups 2 of 366 days2017: Good 171 of 365 days2017: Moderate 194 of 365 days2018: Good 198 of 365 days2018: Moderate 163 of 365 days2018: Unhealthy for Sensitive Groups 4 of 365 days2019: Good 273 of 365 days2019: Moderate 92 of 365 days2020: Good 267 of 366 days2020: Moderate 97 of 366 days2020: Unhealthy for Sensitive Groups 1 of 366 days2020: Unhealthy 1 of 366 days20202021: Good 244 of 365 days2021: Moderate 116 of 365 days2021: Unhealthy for Sensitive Groups 5 of 365 days2022: Good 278 of 365 days2022: Moderate 86 of 365 days2022: Unhealthy for Sensitive Groups 1 of 365 days2023: Good 211 of 365 days2023: Moderate 130 of 365 days2023: Unhealthy for Sensitive Groups 22 of 365 days2023: Unhealthy 2 of 365 days2024: Good 233 of 366 days2024: Moderate 132 of 366 days2024: Unhealthy for Sensitive Groups 1 of 366 days2025: Good 259 of 365 days2025: Moderate 104 of 365 days2025: Unhealthy for Sensitive Groups 2 of 365 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 year0501001502001980: 90th percentile AQI 1541981: 90th percentile AQI 691982: 90th percentile AQI 801983: 90th percentile AQI 581984: 90th percentile AQI 671985: 90th percentile AQI 801986: 90th percentile AQI 571987: 90th percentile AQI 841988: 90th percentile AQI 1031989: 90th percentile AQI 801990: 90th percentile AQI 671991: 90th percentile AQI 671992: 90th percentile AQI 631993: 90th percentile AQI 491994: 90th percentile AQI 511995: 90th percentile AQI 641996: 90th percentile AQI 541997: 90th percentile AQI 641998: 90th percentile AQI 601999: 90th percentile AQI 762000: 90th percentile AQI 822001: 90th percentile AQI 762002: 90th percentile AQI 772003: 90th percentile AQI 742004: 90th percentile AQI 732005: 90th percentile AQI 882006: 90th percentile AQI 802007: 90th percentile AQI 882008: 90th percentile AQI 892009: 90th percentile AQI 672010: 90th percentile AQI 792011: 90th percentile AQI 752012: 90th percentile AQI 822013: 90th percentile AQI 692014: 90th percentile AQI 662015: 90th percentile AQI 632016: 90th percentile AQI 612017: 90th percentile AQI 642018: 90th percentile AQI 672019: 90th percentile AQI 592020: 90th percentile AQI 572021: 90th percentile AQI 642022: 90th percentile AQI 572023: 90th percentile AQI 912024: 90th percentile AQI 612025: 90th percentile AQI 621980: Median AQI 441981: Median AQI 391982: Median AQI 431983: Median AQI 361984: Median AQI 391985: Median AQI 381986: Median AQI 361987: Median AQI 421988: Median AQI 441989: Median AQI 431990: Median AQI 401991: Median AQI 401992: Median AQI 371993: Median AQI 331994: Median AQI 311995: Median AQI 331996: Median AQI 341997: Median AQI 361998: Median AQI 351999: Median AQI 422000: Median AQI 552001: Median AQI 542002: Median AQI 532003: Median AQI 532004: Median AQI 522005: Median AQI 572006: Median AQI 562007: Median AQI 622008: Median AQI 682009: Median AQI 482010: Median AQI 522011: Median AQI 542012: Median AQI 562013: Median AQI 502014: Median AQI 462015: Median AQI 482016: Median AQI 452017: Median AQI 522018: Median AQI 472019: Median AQI 422020: Median AQI 422021: Median AQI 432022: Median AQI 412023: Median AQI 452024: Median AQI 452025: Median AQI 421980198519901995200020052010201520202025
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2025

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
Ozone17648%
Fine particles (PM2.5)16746%
Coarse particles (PM10)226%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
202536525910420004262137Ozone
202436623313210004561101PM2.5
2023365211130222004591169Ozone
20223652788610004157108Ozone
202136524411650004364150PM2.5
20203662679711004257157PM2.5
2019365273920000425980PM2.5
201836519816340004767108PM2.5
20173651711940000526490PM2.5
201636622513920004561130PM2.5
201536519816520004863122PM2.5
201436520615810004666110PM2.5
201336518417830005069118PM2.5
2012366128224140005682140PM2.5
201136514821430005475109PM2.5
201036516319660005279137PM2.5
200936520016410004867124PM2.5
200836633322110006889121PM2.5
200736578276110006288141PM2.5
200636512523190005680122PM2.5
2005365126227120005788122PM2.5
200436616619460005273142PM2.5
200336515920051005374186PM2.5
200236515520820005377112PM2.5
200136514521640005476140PM2.5
200036613422390005582131PM2.5
199936524111392004276164Ozone
19983653025742003560195Ozone
19973652897240003664122Ozone
19963663135201003454168Ozone
19953653055280003364147Ozone
19943653253820003151112Ozone
1993365334310000334984Ozone
19923662907330003763129Ozone
19913652738840004067115Ozone
19903652708771004067151Ozone
1989365241114100004380136Ozone
19883662261003550044103169Ozone
1987365249105110004284126Ozone
19863653015950003657122Ozone
198536524798182003880159Ozone
198436628370121003967182Ozone
19833653065360003658128Ozone
1982365248101113204380218CO
19813652818130003969131Ozone
198036622959392217044154226Ozone

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 Nebraska with a similar median AQI in 2025

All monitored counties in Nebraska

Source: U.S. EPA AirData, “Annual AQI by County” files for 1980–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem