EnviroNearby

Neosho County, Kansas air quality history

Daily Air Quality Index summaries from EPA monitors in Neosho, Kansas, 1988–2025.

64%
Good days in 2025
44
Median daily AQI, 2025
3
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 Neosho, Kansas on 365 days. 234 of those days (64%) were in the Good range, and the median daily AQI was 44. That median is about the same as the typical monitored county in Kansas (median 44 across 11 counties), and higher than the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 207 days. Across the years with fuller monitoring, the share of Good days fell: an average of 81% in 1988–2014 versus 57% in 2023–2025.

Years with fewer than 120 monitored days (2008, 2009, 2010, 2011, 2012, 2013…) 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%1988: Good 165 of 184 days1988: Moderate 14 of 184 days1988: Unhealthy for Sensitive Groups 3 of 184 days1988: Unhealthy 2 of 184 days19881989: Good 255 of 336 days1989: Moderate 71 of 336 days1989: Unhealthy for Sensitive Groups 10 of 336 days1990: Good 56 of 57 days1990: Moderate 1 of 57 days1991: Good 56 of 58 days1991: Moderate 2 of 58 days1992: Good 54 of 56 days1992: Moderate 2 of 56 days1993: Good 59 of 61 days1993: Moderate 2 of 61 days19931994: Good 57 of 58 days1994: Moderate 1 of 58 days1995: Good 50 of 51 days1995: Moderate 1 of 51 days1996: Good 46 of 48 days1996: Moderate 2 of 48 days1997: Good 50 of 50 days1998: Good 51 of 51 days19981999: Good 46 of 58 days1999: Moderate 12 of 58 days2000: Good 57 of 59 days2000: Moderate 2 of 59 days2001: Good 56 of 57 days2001: Moderate 1 of 57 days2002: Good 57 of 58 days2002: Moderate 1 of 58 days2003: Good 57 of 58 days2003: Moderate 1 of 58 days20032004: Good 58 of 58 days2005: Good 55 of 56 days2005: Moderate 1 of 56 days2006: Good 61 of 61 days2007: Good 56 of 58 days2007: Moderate 2 of 58 days2008: Good 54 of 59 days2008: Moderate 5 of 59 days20082009: Good 60 of 60 days2010: Good 61 of 61 days2011: Good 54 of 56 days2011: Moderate 2 of 56 days2012: Good 60 of 61 days2012: Moderate 1 of 61 days2013: Good 59 of 61 days2013: Moderate 2 of 61 days20132014: Good 256 of 331 days2014: Moderate 74 of 331 days2014: Unhealthy for Sensitive Groups 1 of 331 days2015: Good 311 of 364 days2015: Moderate 52 of 364 days2015: Unhealthy for Sensitive Groups 1 of 364 days2016: Good 321 of 366 days2016: Moderate 45 of 366 days2017: Good 304 of 365 days2017: Moderate 61 of 365 days2018: Good 285 of 359 days2018: Moderate 74 of 359 days20182019: Good 219 of 365 days2019: Moderate 145 of 365 days2019: Unhealthy for Sensitive Groups 1 of 365 days2020: Good 235 of 366 days2020: Moderate 129 of 366 days2020: Unhealthy for Sensitive Groups 2 of 366 days2021: Good 171 of 362 days2021: Moderate 189 of 362 days2021: Unhealthy for Sensitive Groups 2 of 362 days2022: Good 201 of 360 days2022: Moderate 159 of 360 days2023: Good 147 of 365 days2023: Moderate 215 of 365 days2023: Unhealthy for Sensitive Groups 1 of 365 days2023: Unhealthy 2 of 365 days20232024: Good 247 of 366 days2024: Moderate 116 of 366 days2024: Unhealthy for Sensitive Groups 2 of 366 days2024: Unhealthy 1 of 366 days2025: Good 234 of 365 days2025: Moderate 128 of 365 days2025: Unhealthy for Sensitive Groups 1 of 365 days2025: Unhealthy 1 of 365 days2025: Hazardous 1 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 year0501001988: 90th percentile AQI 511989: 90th percentile AQI 711990: 90th percentile AQI 431991: 90th percentile AQI 421992: 90th percentile AQI 431993: 90th percentile AQI 381994: 90th percentile AQI 391995: 90th percentile AQI 451996: 90th percentile AQI 321997: 90th percentile AQI 321998: 90th percentile AQI 341999: 90th percentile AQI 602000: 90th percentile AQI 362001: 90th percentile AQI 322002: 90th percentile AQI 362003: 90th percentile AQI 382004: 90th percentile AQI 322005: 90th percentile AQI 372006: 90th percentile AQI 402007: 90th percentile AQI 462008: 90th percentile AQI 462009: 90th percentile AQI 262010: 90th percentile AQI 342011: 90th percentile AQI 442012: 90th percentile AQI 332013: 90th percentile AQI 282014: 90th percentile AQI 592015: 90th percentile AQI 542016: 90th percentile AQI 522017: 90th percentile AQI 552018: 90th percentile AQI 572019: 90th percentile AQI 622020: 90th percentile AQI 592021: 90th percentile AQI 662022: 90th percentile AQI 662023: 90th percentile AQI 712024: 90th percentile AQI 612025: 90th percentile AQI 621988: Median AQI 251989: Median AQI 401990: Median AQI 211991: Median AQI 221992: Median AQI 271993: Median AQI 211994: Median AQI 201995: Median AQI 201996: Median AQI 211997: Median AQI 171998: Median AQI 221999: Median AQI 252000: Median AQI 202001: Median AQI 202002: Median AQI 172003: Median AQI 212004: Median AQI 172005: Median AQI 212006: Median AQI 232007: Median AQI 202008: Median AQI 202009: Median AQI 162010: Median AQI 192011: Median AQI 192012: Median AQI 192013: Median AQI 142014: Median AQI 402015: Median AQI 362016: Median AQI 372017: Median AQI 382018: Median AQI 402019: Median AQI 452020: Median AQI 442021: Median AQI 512022: Median AQI 482023: Median AQI 542024: Median AQI 442025: Median AQI 44198819931998200320082013201820232025
  • 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)20757%
Ozone14540%
Coarse particles (PM10)134%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
202536523412811014462315PM2.5
202436624711621004461168Ozone
202336514721512005471161PM2.5
20223602011590000486694PM2.5
202136217118920005166145PM2.5
202036623512920004459106PM2.5
201936521914510004562119PM2.5
2018359285740000405787Ozone
2017365304610000385577Ozone
2016366321450000375287Ozone
20153643115210003654122Ozone
20143312567410004059116Ozone
2013615920000142858PM10
2012616010000193359PM10
2011565420000194455PM10
2010616100000193447PM10
2009606000000162649PM10
2008595450000204674PM10
2007585620000204683PM10
2006616100000234044PM10
2005565510000213751PM10
2004585800000173238PM10
2003585710000213851PM10
2002585710000173655PM10
2001575610000203255PM10
2000595720000203664PM10
19995846120000256072PM10
1998515100000223444PM10
1997505000000173244PM10
1996484620000213261PM10
1995515010000204552PM10
1994585710000203951PM10
1993615920000213863PM10
1992565420000274352PM10
1991585620000224256PM10
1990575610000214353PM10
198933625571100004071133Ozone
19881841651432002551154Ozone

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 1988–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem