EnviroNearby

Leavenworth County, Kansas air quality history

Daily Air Quality Index summaries from EPA monitors in Leavenworth, Kansas, 2003–2025.

94%
Good days in 2025
34
Median daily AQI, 2025
0
Days above 100 in 2025
364
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Leavenworth, Kansas on 364 days. 342 of those days (94%) were in the Good range, and the median daily AQI was 34. That median is lower than the typical monitored county in Kansas (median 44 across 11 counties), and lower than the typical monitored U.S. county (40). The main pollutant was ozone on 364 days. Across the years with fuller monitoring, the share of Good days rose: an average of 77% in 2003–2005 versus 90% 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%2003: Good 144 of 223 days2003: Moderate 50 of 223 days2003: Unhealthy for Sensitive Groups 28 of 223 days2003: Unhealthy 1 of 223 days20032004: Good 322 of 363 days2004: Moderate 39 of 363 days2004: Unhealthy for Sensitive Groups 2 of 363 days2005: Good 278 of 364 days2005: Moderate 66 of 364 days2005: Unhealthy for Sensitive Groups 19 of 364 days2005: Unhealthy 1 of 364 days20052006: Good 272 of 350 days2006: Moderate 69 of 350 days2006: Unhealthy for Sensitive Groups 9 of 350 days2007: Good 301 of 365 days2007: Moderate 51 of 365 days2007: Unhealthy for Sensitive Groups 10 of 365 days2007: Unhealthy 3 of 365 days20072008: Good 334 of 365 days2008: Moderate 31 of 365 days2009: Good 332 of 360 days2009: Moderate 28 of 360 days20092010: Good 316 of 364 days2010: Moderate 45 of 364 days2010: Unhealthy for Sensitive Groups 3 of 364 days2011: Good 294 of 360 days2011: Moderate 58 of 360 days2011: Unhealthy for Sensitive Groups 8 of 360 days20112012: Good 270 of 363 days2012: Moderate 66 of 363 days2012: Unhealthy for Sensitive Groups 25 of 363 days2012: Unhealthy 2 of 363 days2013: Good 325 of 361 days2013: Moderate 35 of 361 days2013: Unhealthy for Sensitive Groups 1 of 361 days20132014: Good 331 of 363 days2014: Moderate 29 of 363 days2014: Unhealthy for Sensitive Groups 3 of 363 days2015: Good 347 of 365 days2015: Moderate 18 of 365 days20152016: Good 333 of 362 days2016: Moderate 29 of 362 days2017: Good 340 of 361 days2017: Moderate 21 of 361 days20172018: Good 325 of 362 days2018: Moderate 37 of 362 days2019: Good 347 of 362 days2019: Moderate 15 of 362 days20192020: Good 356 of 366 days2020: Moderate 10 of 366 days2021: Good 330 of 348 days2021: Moderate 16 of 348 days2021: Unhealthy for Sensitive Groups 2 of 348 days20212022: Good 341 of 365 days2022: Moderate 24 of 365 days2023: Good 303 of 364 days2023: Moderate 51 of 364 days2023: Unhealthy for Sensitive Groups 10 of 364 days20232024: Good 327 of 348 days2024: Moderate 21 of 348 days2025: Good 342 of 364 days2025: Moderate 22 of 364 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 year0501001502003: 90th percentile AQI 1052004: 90th percentile AQI 542005: 90th percentile AQI 842006: 90th percentile AQI 772007: 90th percentile AQI 772008: 90th percentile AQI 502009: 90th percentile AQI 502010: 90th percentile AQI 542011: 90th percentile AQI 712012: 90th percentile AQI 932013: 90th percentile AQI 502014: 90th percentile AQI 492015: 90th percentile AQI 482016: 90th percentile AQI 492017: 90th percentile AQI 472018: 90th percentile AQI 512019: 90th percentile AQI 452020: 90th percentile AQI 442021: 90th percentile AQI 472022: 90th percentile AQI 492023: 90th percentile AQI 642024: 90th percentile AQI 492025: 90th percentile AQI 482003: Median AQI 442004: Median AQI 352005: Median AQI 372006: Median AQI 382007: Median AQI 362008: Median AQI 352009: Median AQI 332010: Median AQI 362011: Median AQI 362012: Median AQI 382013: Median AQI 362014: Median AQI 352015: Median AQI 342016: Median AQI 352017: Median AQI 342018: Median AQI 332019: Median AQI 332020: Median AQI 322021: Median AQI 342022: Median AQI 372023: Median AQI 372024: Median AQI 362025: Median AQI 34200320052007200920112013201520172019202120232025
  • 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
Ozone364100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2025364342220000344897Ozone
2024348327210000364997Ozone
202336430351100003764129Ozone
2022365341240000374980Ozone
20213483301620003447126Ozone
2020366356100000324477Ozone
2019362347150000334597Ozone
20183623253700003351100Ozone
2017361340210000344774Ozone
2016362333290000354997Ozone
2015365347180000344871Ozone
20143633312930003549105Ozone
20133613253510003650112Ozone
201236327066252003893174Ozone
20113602945880003671147Ozone
20103643164530003654143Ozone
2009360332280000335090Ozone
2008365334310000355093Ozone
200736530151103003677174Ozone
20063502726990003877143Ozone
200536427866191003784177Ozone
20043633223920003554112Ozone
2003223144502810044105172Ozone

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 Kansas with a similar median AQI in 2025

All monitored counties in Kansas

Source: U.S. EPA AirData, “Annual AQI by County” files for 2003–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem