EnviroNearby

Thurston County, Nebraska air quality history

Daily Air Quality Index summaries from EPA monitors in Thurston, Nebraska, 2003–2008.

74%
Good days in 2008
38
Median daily AQI, 2008
0
Days above 100 in 2008
47
Days with an AQI in 2008 (of 366)

In 2008, EPA reported a daily Air Quality Index (AQI) for Thurston, Nebraska on 47 days. 35 of those days (74%) were in the Good range, and the median daily AQI was 38. That median is higher than the typical monitored county in Nebraska (median 34 across 5 counties), and lower than the typical monitored U.S. county (44). The main pollutant was fine particles (PM2.5) on 47 days.

EPA did not report an AQI for every day of 2008 here (47 of 366 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 2008; EPA's files for 2009–2025 contain no row for it, which usually means its monitors stopped reporting.

Years with fewer than 120 monitored days (2003, 2004, 2005, 2006, 2007, 2008) 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%2003: Good 33 of 44 days2003: Moderate 11 of 44 days20032004: Good 75 of 105 days2004: Moderate 30 of 105 days20042005: Good 75 of 114 days2005: Moderate 39 of 114 days20052006: Good 78 of 105 days2006: Moderate 27 of 105 days20062007: Good 76 of 114 days2007: Moderate 38 of 114 days20072008: Good 35 of 47 days2008: Moderate 12 of 47 days2008
  • 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 year0501002003: 90th percentile AQI 612004: 90th percentile AQI 582005: 90th percentile AQI 642006: 90th percentile AQI 612007: 90th percentile AQI 622008: 90th percentile AQI 552003: Median AQI 332004: Median AQI 372005: Median AQI 372006: Median AQI 342007: Median AQI 372008: Median AQI 38200320042005200620072008
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2008

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)47100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20084735120000385577PM2.5
200711476380000376291PM2.5
200610578270000346186PM2.5
200511475390000376496PM2.5
200410575300000375887PM2.5
20034433110000336175PM2.5

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.

All monitored counties in Nebraska

Source: U.S. EPA AirData, “Annual AQI by County” files for 2003–2008 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem