EnviroNearby

Thomas County, Nebraska air quality history

Daily Air Quality Index summaries from EPA monitors in Thomas, Nebraska, 2002–2025.

92%
Good days in 2025
22
Median daily AQI, 2025
0
Days above 100 in 2025
92
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Thomas, Nebraska on 92 days. 85 of those days (92%) were in the Good range, and the median daily AQI was 22. That median is lower than the typical monitored county in Nebraska (median 34 across 10 counties), and lower than the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 92 days.

EPA did not report an AQI for every day of 2025 here (92 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.

Years with fewer than 120 monitored days (2019, 2020, 2021, 2022, 2024, 2025…) 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%2002: Good 48 of 51 days2002: Moderate 3 of 51 days20022003: Good 98 of 115 days2003: Moderate 17 of 115 days2004: Good 104 of 113 days2004: Moderate 9 of 113 days20042005: Good 105 of 116 days2005: Moderate 11 of 116 days2006: Good 105 of 110 days2006: Moderate 5 of 110 days20062007: Good 98 of 105 days2007: Moderate 7 of 105 days2008: Good 21 of 22 days2008: Moderate 1 of 22 days20082009: Good 110 of 116 days2009: Moderate 6 of 116 days2010: Good 103 of 109 days2010: Moderate 6 of 109 days20102011: Good 106 of 114 days2011: Moderate 8 of 114 days2012: Good 92 of 104 days2012: Moderate 12 of 104 days20122013: Good 102 of 113 days2013: Moderate 11 of 113 days2014: Good 92 of 94 days2014: Moderate 2 of 94 days20142015: Good 112 of 118 days2015: Moderate 6 of 118 days2016: Good 112 of 113 days2016: Moderate 1 of 113 days20162017: Good 110 of 116 days2017: Moderate 6 of 116 days2018: Good 104 of 114 days2018: Moderate 10 of 114 days20182019: Good 105 of 109 days2019: Moderate 4 of 109 days2020: Good 109 of 115 days2020: Moderate 6 of 115 days20202021: Good 111 of 117 days2021: Moderate 6 of 117 days2022: Good 85 of 89 days2022: Moderate 4 of 89 days20222024: Good 22 of 22 days2025: Good 85 of 92 days2025: Moderate 7 of 92 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 year0501002002: 90th percentile AQI 432003: 90th percentile AQI 532004: 90th percentile AQI 472005: 90th percentile AQI 492006: 90th percentile AQI 432007: 90th percentile AQI 472008: 90th percentile AQI 392009: 90th percentile AQI 412010: 90th percentile AQI 442011: 90th percentile AQI 462012: 90th percentile AQI 522013: 90th percentile AQI 482014: 90th percentile AQI 392015: 90th percentile AQI 392016: 90th percentile AQI 302017: 90th percentile AQI 422018: 90th percentile AQI 472019: 90th percentile AQI 342020: 90th percentile AQI 362021: 90th percentile AQI 442022: 90th percentile AQI 362024: 90th percentile AQI 332025: 90th percentile AQI 432002: Median AQI 142003: Median AQI 222004: Median AQI 212005: Median AQI 202006: Median AQI 182007: Median AQI 252008: Median AQI 162009: Median AQI 192010: Median AQI 222011: Median AQI 212012: Median AQI 242013: Median AQI 192014: Median AQI 182015: Median AQI 192016: Median AQI 142017: Median AQI 162018: Median AQI 212019: Median AQI 162020: Median AQI 142021: Median AQI 192022: Median AQI 172024: Median AQI 122025: Median AQI 22200220042006200820102012201420162018202020222025
  • 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
Fine particles (PM2.5)92100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2025928570000224387PM2.5
2024222200000123336PM2.5
2022898540000173655PM2.5
202111711160000194484PM2.5
202011510960000143674PM2.5
201910910540000163462PM2.5
2018114104100000214779PM2.5
201711611060000164276PM2.5
201611311210000143051PM2.5
201511811260000193973PM2.5
2014949220000183952PM2.5
2013113102110000194865PM2.5
201210492120000245262PM2.5
201111410680000214683PM2.5
201010910360000224488PM2.5
200911611060000194166PM2.5
2008222110000163952PM2.5
20071059870000254769PM2.5
200611010550000184360PM2.5
2005116105110000204970PM2.5
200411310490000214763PM2.5
200311598170000225371PM2.5
2002514830000144364PM2.5

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 2002–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem