EnviroNearby

Sherman County, Kansas air quality history

Daily Air Quality Index summaries from EPA monitors in Sherman, Kansas, 1985–2025.

90%
Good days in 2025
27
Median daily AQI, 2025
0
Days above 100 in 2025
333
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Sherman, Kansas on 333 days. 300 of those days (90%) were in the Good range, and the median daily AQI was 27. 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 fine particles (PM2.5) on 251 days. Across the years with fuller monitoring, the share of Good days fell: an average of 93% in 1994–1996 versus 89% in 2023–2025.

Years with fewer than 120 monitored days (2011, 2012, 2013, 2014, 2015, 2016…) 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%1985: Good 20 of 21 days1985: Moderate 1 of 21 days19851986: Good 41 of 46 days1986: Moderate 5 of 46 days1987: Good 39 of 49 days1987: Moderate 10 of 49 days1988: Good 39 of 45 days1988: Moderate 6 of 45 days1989: Good 37 of 40 days1989: Moderate 3 of 40 days1990: Good 54 of 55 days1990: Moderate 1 of 55 days19901991: Good 52 of 54 days1991: Moderate 2 of 54 days1992: Good 52 of 58 days1992: Moderate 6 of 58 days1993: Good 105 of 108 days1993: Moderate 3 of 108 days1994: Good 319 of 347 days1994: Moderate 28 of 347 days1995: Good 332 of 364 days1995: Moderate 31 of 364 days1995: Unhealthy for Sensitive Groups 1 of 364 days19951996: Good 139 of 143 days1996: Moderate 4 of 143 days1997: Good 44 of 45 days1997: Moderate 1 of 45 days1998: Good 55 of 58 days1998: Moderate 3 of 58 days1999: Good 47 of 57 days1999: Moderate 10 of 57 days2000: Good 56 of 58 days2000: Moderate 2 of 58 days20002001: Good 61 of 61 days2002: Good 47 of 55 days2002: Moderate 8 of 55 days2003: Good 54 of 56 days2003: Moderate 2 of 56 days2004: Good 47 of 48 days2004: Moderate 1 of 48 days2005: Good 43 of 43 days20052006: Good 44 of 44 days2007: Good 53 of 53 days2008: Good 47 of 51 days2008: Moderate 4 of 51 days2009: Good 49 of 51 days2009: Moderate 2 of 51 days2010: Good 49 of 50 days2010: Moderate 1 of 50 days20102011: Good 48 of 50 days2011: Moderate 1 of 50 days2011: Unhealthy for Sensitive Groups 1 of 50 days2012: Good 51 of 57 days2012: Moderate 6 of 57 days2013: Good 56 of 61 days2013: Moderate 4 of 61 days2013: Unhealthy for Sensitive Groups 1 of 61 days2014: Good 61 of 61 days2015: Good 58 of 59 days2015: Moderate 1 of 59 days20152016: Good 48 of 58 days2016: Moderate 10 of 58 days2017: Good 228 of 232 days2017: Moderate 4 of 232 days2018: Good 344 of 350 days2018: Moderate 6 of 350 days2019: Good 354 of 358 days2019: Moderate 4 of 358 days2020: Good 282 of 303 days2020: Moderate 20 of 303 days2020: Unhealthy for Sensitive Groups 1 of 303 days20202021: Good 308 of 320 days2021: Moderate 11 of 320 days2021: Very Unhealthy 1 of 320 days2022: Good 338 of 360 days2022: Moderate 18 of 360 days2022: Unhealthy for Sensitive Groups 3 of 360 days2022: Hazardous 1 of 360 days2023: Good 315 of 334 days2023: Moderate 19 of 334 days2024: Good 271 of 324 days2024: Moderate 51 of 324 days2024: Unhealthy for Sensitive Groups 2 of 324 days2025: Good 300 of 333 days2025: Moderate 33 of 333 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 year0501001985: 90th percentile AQI 361986: 90th percentile AQI 521987: 90th percentile AQI 531988: 90th percentile AQI 521989: 90th percentile AQI 471990: 90th percentile AQI 411991: 90th percentile AQI 421992: 90th percentile AQI 511993: 90th percentile AQI 361994: 90th percentile AQI 481995: 90th percentile AQI 491996: 90th percentile AQI 421997: 90th percentile AQI 431998: 90th percentile AQI 391999: 90th percentile AQI 572000: 90th percentile AQI 382001: 90th percentile AQI 352002: 90th percentile AQI 532003: 90th percentile AQI 432004: 90th percentile AQI 362005: 90th percentile AQI 352006: 90th percentile AQI 272007: 90th percentile AQI 352008: 90th percentile AQI 442009: 90th percentile AQI 362010: 90th percentile AQI 422011: 90th percentile AQI 452012: 90th percentile AQI 512013: 90th percentile AQI 442014: 90th percentile AQI 332015: 90th percentile AQI 362016: 90th percentile AQI 542017: 90th percentile AQI 312018: 90th percentile AQI 312019: 90th percentile AQI 312020: 90th percentile AQI 442021: 90th percentile AQI 382022: 90th percentile AQI 412023: 90th percentile AQI 442024: 90th percentile AQI 582025: 90th percentile AQI 491985: Median AQI 201986: Median AQI 301987: Median AQI 371988: Median AQI 251989: Median AQI 211990: Median AQI 221991: Median AQI 241992: Median AQI 301993: Median AQI 251994: Median AQI 351995: Median AQI 341996: Median AQI 281997: Median AQI 171998: Median AQI 191999: Median AQI 202000: Median AQI 212001: Median AQI 192002: Median AQI 172003: Median AQI 192004: Median AQI 162005: Median AQI 192006: Median AQI 192007: Median AQI 192008: Median AQI 192009: Median AQI 192010: Median AQI 192011: Median AQI 192012: Median AQI 212013: Median AQI 192014: Median AQI 152015: Median AQI 182016: Median AQI 202017: Median AQI 152018: Median AQI 142019: Median AQI 122020: Median AQI 132021: Median AQI 172022: Median AQI 182023: Median AQI 192024: Median AQI 272025: Median AQI 27198519901995200020052010201520202025
  • 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)25175%
Coarse particles (PM10)8225%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2025333300330000274993PM2.5
20243242715120002758138PM2.5
2023334315190000194478PM10
20223603381830011841494PM10
20213203081100101738221PM10
20203032822010001344106PM10
201935835440000123158PM10
201835034460000143191PM10
201723222840000153160PM10
20165848100000205498PM10
2015595810000183673PM10
2014616100000153349PM10
20136156410001944104PM10
2012575160000215178PM10
20115048110001945106PM10
2010504910000194259PM10
2009514920000193661PM10
2008514740000194467PM10
2007535300000193542PM10
2006444400000192737PM10
2005434300000193540PM10
2004484710000163654PM10
2003565420000194386PM10
2002554780000175366PM10
2001616100000193548PM10
2000585620000213863PM10
19995747100000205789PM10
1998585530000193975PM10
1997454410000174351PM10
199614313940000284270Ozone
19953643323110003449115Ozone
1994347319280000354890Ozone
199310810530000253655Ozone
1992585260000305177PM10
1991545220000244279PM10
1990555410000224151PM10
1989403730000214769PM10
1988453960000255262PM10
19874939100000375362PM10
1986464150000305282PM10
1985212010000203655PM10

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 1985–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem