EnviroNearby

Kane County, Illinois air quality history

Daily Air Quality Index summaries from EPA monitors in Kane, Illinois, 1980–2025.

62%
Good days in 2025
45
Median daily AQI, 2025
9
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 Kane, Illinois on 365 days. 226 of those days (62%) were in the Good range, and the median daily AQI was 45. That median is higher than the typical monitored county in Illinois (median 42 across 23 counties), and higher than the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 220 days. Across the years with fuller monitoring, the share of Good days fell: an average of 91% in 1980–1982 versus 65% 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%1980: Good 239 of 277 days1980: Moderate 27 of 277 days1980: Unhealthy for Sensitive Groups 11 of 277 days19801981: Good 303 of 338 days1981: Moderate 27 of 338 days1981: Unhealthy for Sensitive Groups 5 of 338 days1981: Unhealthy 3 of 338 days1982: Good 311 of 322 days1982: Moderate 11 of 322 days1983: Good 294 of 344 days1983: Moderate 30 of 344 days1983: Unhealthy for Sensitive Groups 15 of 344 days1983: Unhealthy 4 of 344 days1983: Very Unhealthy 1 of 344 days1984: Good 312 of 355 days1984: Moderate 34 of 355 days1984: Unhealthy for Sensitive Groups 8 of 355 days1984: Unhealthy 1 of 355 days1985: Good 309 of 348 days1985: Moderate 31 of 348 days1985: Unhealthy for Sensitive Groups 8 of 348 days19851986: Good 319 of 353 days1986: Moderate 30 of 353 days1986: Unhealthy for Sensitive Groups 3 of 353 days1986: Unhealthy 1 of 353 days1987: Good 289 of 342 days1987: Moderate 38 of 342 days1987: Unhealthy for Sensitive Groups 13 of 342 days1987: Unhealthy 2 of 342 days1988: Good 233 of 313 days1988: Moderate 47 of 313 days1988: Unhealthy for Sensitive Groups 29 of 313 days1988: Unhealthy 3 of 313 days1988: Very Unhealthy 1 of 313 days1989: Good 302 of 351 days1989: Moderate 37 of 351 days1989: Unhealthy for Sensitive Groups 10 of 351 days1989: Unhealthy 2 of 351 days1990: Good 316 of 353 days1990: Moderate 33 of 353 days1990: Unhealthy for Sensitive Groups 4 of 353 days19901991: Good 302 of 355 days1991: Moderate 38 of 355 days1991: Unhealthy for Sensitive Groups 11 of 355 days1991: Unhealthy 3 of 355 days1991: Very Unhealthy 1 of 355 days1992: Good 329 of 350 days1992: Moderate 13 of 350 days1992: Unhealthy for Sensitive Groups 6 of 350 days1992: Unhealthy 2 of 350 days1993: Good 330 of 358 days1993: Moderate 21 of 358 days1993: Unhealthy for Sensitive Groups 7 of 358 days1994: Good 317 of 364 days1994: Moderate 37 of 364 days1994: Unhealthy for Sensitive Groups 7 of 364 days1994: Unhealthy 2 of 364 days1994: Very Unhealthy 1 of 364 days1995: Good 310 of 365 days1995: Moderate 36 of 365 days1995: Unhealthy for Sensitive Groups 12 of 365 days1995: Unhealthy 6 of 365 days1995: Very Unhealthy 1 of 365 days19951996: Good 325 of 359 days1996: Moderate 26 of 359 days1996: Unhealthy for Sensitive Groups 8 of 359 days1997: Good 329 of 365 days1997: Moderate 30 of 365 days1997: Unhealthy for Sensitive Groups 6 of 365 days1998: Good 312 of 355 days1998: Moderate 36 of 355 days1998: Unhealthy for Sensitive Groups 7 of 355 days1999: Good 322 of 360 days1999: Moderate 29 of 360 days1999: Unhealthy for Sensitive Groups 9 of 360 days2000: Good 277 of 365 days2000: Moderate 83 of 365 days2000: Unhealthy for Sensitive Groups 5 of 365 days20002001: Good 243 of 365 days2001: Moderate 111 of 365 days2001: Unhealthy for Sensitive Groups 10 of 365 days2001: Unhealthy 1 of 365 days2002: Good 243 of 363 days2002: Moderate 96 of 363 days2002: Unhealthy for Sensitive Groups 21 of 363 days2002: Unhealthy 3 of 363 days2003: Good 293 of 364 days2003: Moderate 64 of 364 days2003: Unhealthy for Sensitive Groups 7 of 364 days2004: Good 313 of 365 days2004: Moderate 49 of 365 days2004: Unhealthy for Sensitive Groups 3 of 365 days2005: Good 264 of 365 days2005: Moderate 83 of 365 days2005: Unhealthy for Sensitive Groups 13 of 365 days2005: Unhealthy 5 of 365 days20052006: Good 282 of 337 days2006: Moderate 54 of 337 days2006: Unhealthy for Sensitive Groups 1 of 337 days2007: Good 278 of 365 days2007: Moderate 77 of 365 days2007: Unhealthy for Sensitive Groups 10 of 365 days2008: Good 308 of 364 days2008: Moderate 54 of 364 days2008: Unhealthy for Sensitive Groups 2 of 364 days2009: Good 313 of 365 days2009: Moderate 52 of 365 days2010: Good 305 of 365 days2010: Moderate 57 of 365 days2010: Unhealthy for Sensitive Groups 3 of 365 days20102011: Good 314 of 356 days2011: Moderate 39 of 356 days2011: Unhealthy for Sensitive Groups 3 of 356 days2012: Good 294 of 347 days2012: Moderate 45 of 347 days2012: Unhealthy for Sensitive Groups 6 of 347 days2012: Unhealthy 2 of 347 days2013: Good 301 of 319 days2013: Moderate 18 of 319 days2014: Good 314 of 363 days2014: Moderate 48 of 363 days2014: Unhealthy for Sensitive Groups 1 of 363 days2015: Good 289 of 363 days2015: Moderate 73 of 363 days2015: Unhealthy for Sensitive Groups 1 of 363 days20152016: Good 286 of 358 days2016: Moderate 64 of 358 days2016: Unhealthy for Sensitive Groups 8 of 358 days2017: Good 275 of 353 days2017: Moderate 77 of 353 days2017: Unhealthy for Sensitive Groups 1 of 353 days2018: Good 275 of 364 days2018: Moderate 84 of 364 days2018: Unhealthy for Sensitive Groups 5 of 364 days2019: Good 210 of 284 days2019: Moderate 70 of 284 days2019: Unhealthy for Sensitive Groups 4 of 284 days2020: Good 204 of 279 days2020: Moderate 68 of 279 days2020: Unhealthy for Sensitive Groups 6 of 279 days2020: Unhealthy 1 of 279 days20202021: Good 188 of 285 days2021: Moderate 96 of 285 days2021: Unhealthy for Sensitive Groups 1 of 285 days2022: Good 189 of 285 days2022: Moderate 93 of 285 days2022: Unhealthy for Sensitive Groups 3 of 285 days2023: Good 178 of 288 days2023: Moderate 89 of 288 days2023: Unhealthy for Sensitive Groups 16 of 288 days2023: Unhealthy 5 of 288 days2024: Good 237 of 328 days2024: Moderate 90 of 328 days2024: Unhealthy for Sensitive Groups 1 of 328 days2025: Good 226 of 365 days2025: Moderate 130 of 365 days2025: Unhealthy for Sensitive Groups 8 of 365 days2025: Unhealthy 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 year0501001501980: 90th percentile AQI 711981: 90th percentile AQI 541982: 90th percentile AQI 411983: 90th percentile AQI 771984: 90th percentile AQI 581985: 90th percentile AQI 541986: 90th percentile AQI 501987: 90th percentile AQI 671988: 90th percentile AQI 1011989: 90th percentile AQI 641990: 90th percentile AQI 541991: 90th percentile AQI 671992: 90th percentile AQI 451993: 90th percentile AQI 491994: 90th percentile AQI 581995: 90th percentile AQI 711996: 90th percentile AQI 501997: 90th percentile AQI 501998: 90th percentile AQI 551999: 90th percentile AQI 542000: 90th percentile AQI 712001: 90th percentile AQI 752002: 90th percentile AQI 842003: 90th percentile AQI 642004: 90th percentile AQI 572005: 90th percentile AQI 842006: 90th percentile AQI 612007: 90th percentile AQI 712008: 90th percentile AQI 552009: 90th percentile AQI 582010: 90th percentile AQI 612011: 90th percentile AQI 542012: 90th percentile AQI 672013: 90th percentile AQI 472014: 90th percentile AQI 552015: 90th percentile AQI 602016: 90th percentile AQI 592017: 90th percentile AQI 642018: 90th percentile AQI 632019: 90th percentile AQI 662020: 90th percentile AQI 662021: 90th percentile AQI 672022: 90th percentile AQI 672023: 90th percentile AQI 872024: 90th percentile AQI 632025: 90th percentile AQI 731980: Median AQI 291981: Median AQI 241982: Median AQI 241983: Median AQI 281984: Median AQI 281985: Median AQI 301986: Median AQI 281987: Median AQI 281988: Median AQI 311989: Median AQI 311990: Median AQI 291991: Median AQI 311992: Median AQI 271993: Median AQI 311994: Median AQI 321995: Median AQI 291996: Median AQI 291997: Median AQI 291998: Median AQI 281999: Median AQI 302000: Median AQI 362001: Median AQI 372002: Median AQI 382003: Median AQI 322004: Median AQI 312005: Median AQI 352006: Median AQI 312007: Median AQI 342008: Median AQI 332009: Median AQI 322010: Median AQI 372011: Median AQI 322012: Median AQI 312013: Median AQI 302014: Median AQI 342015: Median AQI 362016: Median AQI 362017: Median AQI 402018: Median AQI 392019: Median AQI 422020: Median AQI 422021: Median AQI 442022: Median AQI 422023: Median AQI 462024: Median AQI 422025: Median AQI 451980198519901995200020052010201520202025
  • 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)22060%
Ozone14540%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
202536522613081004573165PM2.5
20243282379010004263105Ozone
202328817889165004687174Ozone
20222851899330004267129Ozone
20212851889610004467112Ozone
20202792046861004266161Ozone
20192842107040004266112Ozone
20183642758450003963122Ozone
20173532757710004064143Ozone
20163582866480003659140Ozone
20153632897310003660124Ozone
20143633144810003455101Ozone
2013319301180000304797Ozone
20123472944562003167169Ozone
20113563143930003254126Ozone
20103653055730003761122Ozone
2009365313520000325897Ozone
20083643085420003355101Ozone
200736527877100003471140Ozone
20063372825410003161108Ozone
200536526483135003584166Ozone
20043653134930003157112Ozone
20033642936470003264126Ozone
200236324396213003884161Ozone
2001365243111101003775151Ozone
20003652778350003671115Ozone
19993603222990003054150Ozone
19983553123670002855122Ozone
19973653293060002950147Ozone
19963593252680002950140Ozone
199536531036126102971205Ozone
19943643173772103258204Ozone
19933583302170003149126Ozone
19923503291362002745187Ozone
199135530238113103167201Ozone
19903533163340002954126Ozone
198935130237102003164154Ozone
1988313233472931031101205Ozone
198734228938132002867166Ozone
19863533193031002850161Ozone
19853483093180003054143Ozone
19843553123481002858156Ozone
198334429430154102877204Ozone
1982322311110000244167Ozone
19813383032753002454182Ozone
198027723927110002971143Ozone

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 Illinois with a similar median AQI in 2025

All monitored counties in Illinois

Source: U.S. EPA AirData, “Annual AQI by County” files for 1980–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem