EnviroNearby

Sumner County, Kansas air quality history

Daily Air Quality Index summaries from EPA monitors in Sumner, Kansas, 1999–2025.

66%
Good days in 2025
45
Median daily AQI, 2025
4
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 Sumner, Kansas on 365 days. 240 of those days (66%) were in the Good range, and the median daily AQI was 45. 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 229 days. Across the years with fuller monitoring, the share of Good days held roughly steady: an average of 62% in 1999–2001 versus 60% 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%1999: Good 107 of 167 days1999: Moderate 48 of 167 days1999: Unhealthy for Sensitive Groups 9 of 167 days1999: Unhealthy 3 of 167 days19992000: Good 224 of 361 days2000: Moderate 121 of 361 days2000: Unhealthy for Sensitive Groups 15 of 361 days2000: Unhealthy 1 of 361 days2001: Good 214 of 365 days2001: Moderate 119 of 365 days2001: Unhealthy for Sensitive Groups 31 of 365 days2001: Unhealthy 1 of 365 days20012002: Good 240 of 364 days2002: Moderate 104 of 364 days2002: Unhealthy for Sensitive Groups 20 of 364 days2003: Good 219 of 364 days2003: Moderate 127 of 364 days2003: Unhealthy for Sensitive Groups 18 of 364 days20032004: Good 298 of 356 days2004: Moderate 58 of 356 days2005: Good 230 of 365 days2005: Moderate 123 of 365 days2005: Unhealthy for Sensitive Groups 12 of 365 days20052006: Good 243 of 365 days2006: Moderate 103 of 365 days2006: Unhealthy for Sensitive Groups 18 of 365 days2006: Unhealthy 1 of 365 days2007: Good 268 of 365 days2007: Moderate 94 of 365 days2007: Unhealthy for Sensitive Groups 3 of 365 days20072008: Good 267 of 365 days2008: Moderate 95 of 365 days2008: Unhealthy for Sensitive Groups 3 of 365 days2009: Good 289 of 365 days2009: Moderate 72 of 365 days2009: Unhealthy for Sensitive Groups 4 of 365 days20092010: Good 260 of 365 days2010: Moderate 98 of 365 days2010: Unhealthy for Sensitive Groups 7 of 365 days2011: Good 238 of 365 days2011: Moderate 110 of 365 days2011: Unhealthy for Sensitive Groups 17 of 365 days20112012: Good 248 of 366 days2012: Moderate 93 of 366 days2012: Unhealthy for Sensitive Groups 23 of 366 days2012: Unhealthy 2 of 366 days2013: Good 284 of 365 days2013: Moderate 77 of 365 days2013: Unhealthy for Sensitive Groups 4 of 365 days20132014: Good 292 of 364 days2014: Moderate 70 of 364 days2014: Unhealthy for Sensitive Groups 2 of 364 days2015: Good 299 of 365 days2015: Moderate 66 of 365 days20152016: Good 320 of 362 days2016: Moderate 42 of 362 days2017: Good 297 of 365 days2017: Moderate 68 of 365 days20172018: Good 293 of 365 days2018: Moderate 72 of 365 days2019: Good 287 of 365 days2019: Moderate 78 of 365 days20192020: Good 231 of 366 days2020: Moderate 132 of 366 days2020: Unhealthy for Sensitive Groups 3 of 366 days2021: Good 167 of 365 days2021: Moderate 194 of 365 days2021: Unhealthy for Sensitive Groups 4 of 365 days20212022: Good 197 of 365 days2022: Moderate 165 of 365 days2022: Unhealthy for Sensitive Groups 3 of 365 days2023: Good 179 of 365 days2023: Moderate 182 of 365 days2023: Unhealthy for Sensitive Groups 3 of 365 days2023: Unhealthy 1 of 365 days20232024: Good 232 of 362 days2024: Moderate 127 of 362 days2024: Unhealthy for Sensitive Groups 2 of 362 days2024: Unhealthy 1 of 362 days2025: Good 240 of 365 days2025: Moderate 121 of 365 days2025: Unhealthy for Sensitive Groups 3 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 year0501001999: 90th percentile AQI 972000: 90th percentile AQI 802001: 90th percentile AQI 972002: 90th percentile AQI 902003: 90th percentile AQI 862004: 90th percentile AQI 552005: 90th percentile AQI 802006: 90th percentile AQI 842007: 90th percentile AQI 672008: 90th percentile AQI 632009: 90th percentile AQI 592010: 90th percentile AQI 682011: 90th percentile AQI 842012: 90th percentile AQI 872013: 90th percentile AQI 612014: 90th percentile AQI 582015: 90th percentile AQI 582016: 90th percentile AQI 512017: 90th percentile AQI 562018: 90th percentile AQI 582019: 90th percentile AQI 572020: 90th percentile AQI 632021: 90th percentile AQI 682022: 90th percentile AQI 672023: 90th percentile AQI 672024: 90th percentile AQI 622025: 90th percentile AQI 611999: Median AQI 442000: Median AQI 442001: Median AQI 452002: Median AQI 442003: Median AQI 442004: Median AQI 312005: Median AQI 442006: Median AQI 442007: Median AQI 422008: Median AQI 412009: Median AQI 392010: Median AQI 432011: Median AQI 452012: Median AQI 422013: Median AQI 412014: Median AQI 402015: Median AQI 382016: Median AQI 382017: Median AQI 392018: Median AQI 382019: Median AQI 412020: Median AQI 452021: Median AQI 522022: Median AQI 482023: Median AQI 512024: Median AQI 442025: Median AQI 4519992001200320052007200920112013201520172019202120232025
  • 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)22963%
Ozone11231%
Coarse particles (PM10)247%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
202536524012130014561370PM2.5
202436223212721004462196PM2.5
202336517918231005167152PM2.5
202236519716530004867115PM2.5
202136516719440005268147PM2.5
202036623113230004563117PM2.5
2019365287780000415797Ozone
2018365293720000385890Ozone
2017365297680000395697Ozone
2016362320420000385190Ozone
20153652996600003858100Ozone
20143642927020004058138Ozone
20133652847740004161112Ozone
201236624893232004287156Ozone
2011365238110170004584143Ozone
20103652609870004368122Ozone
20093652897240003959136Ozone
20083652679530004163122Ozone
20073652689430004267119Ozone
2006365243103181004484151Ozone
2005365230123120004480147Ozone
2004356298580000315578Ozone
2003364219127180004486133Ozone
2002364240104200004490150Ozone
2001365214119311004597179Ozone
2000361224121151004480156Ozone
19991671074893004497166Ozone

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 1999–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem