EnviroNearby

Linn County, Kansas air quality history

Daily Air Quality Index summaries from EPA monitors in Linn, Kansas, 1998–2014.

81%
Good days in 2013
39
Median daily AQI, 2013
0
Days above 100 in 2013
364
Days with an AQI in 2013 (of 365)

In 2013, EPA reported a daily Air Quality Index (AQI) for Linn, Kansas on 364 days. 295 of those days (81%) were in the Good range, and the median daily AQI was 39. That median is about the same as the typical monitored county in Kansas (median 40 across 10 counties), and lower than the typical monitored U.S. county (42). The main pollutant was ozone on 293 days. Across the years with fuller monitoring, the share of Good days rose: an average of 61% in 1998–2000 versus 73% in 2011–2013.

The most recent year with data for this county is 2014; EPA's files for 2015–2025 contain no row for it, which usually means its monitors stopped reporting.

Years with fewer than 120 monitored days (2014) 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%1998: Good 150 of 240 days1998: Moderate 70 of 240 days1998: Unhealthy for Sensitive Groups 17 of 240 days1998: Unhealthy 3 of 240 days19981999: Good 210 of 361 days1999: Moderate 130 of 361 days1999: Unhealthy for Sensitive Groups 18 of 361 days1999: Unhealthy 3 of 361 days2000: Good 219 of 353 days2000: Moderate 111 of 353 days2000: Unhealthy for Sensitive Groups 20 of 353 days2000: Unhealthy 3 of 353 days20002001: Good 217 of 362 days2001: Moderate 135 of 362 days2001: Unhealthy for Sensitive Groups 10 of 362 days2002: Good 246 of 365 days2002: Moderate 110 of 365 days2002: Unhealthy for Sensitive Groups 9 of 365 days20022003: Good 216 of 363 days2003: Moderate 132 of 363 days2003: Unhealthy for Sensitive Groups 15 of 363 days2004: Good 291 of 366 days2004: Moderate 74 of 366 days2004: Unhealthy for Sensitive Groups 1 of 366 days20042005: Good 228 of 359 days2005: Moderate 119 of 359 days2005: Unhealthy for Sensitive Groups 12 of 359 days2006: Good 237 of 363 days2006: Moderate 114 of 363 days2006: Unhealthy for Sensitive Groups 12 of 363 days20062007: Good 259 of 365 days2007: Moderate 104 of 365 days2007: Unhealthy for Sensitive Groups 2 of 365 days2008: Good 275 of 363 days2008: Moderate 88 of 363 days20082009: Good 295 of 363 days2009: Moderate 67 of 363 days2009: Unhealthy for Sensitive Groups 1 of 363 days2010: Good 283 of 365 days2010: Moderate 82 of 365 days20102011: Good 253 of 365 days2011: Moderate 103 of 365 days2011: Unhealthy for Sensitive Groups 9 of 365 days2012: Good 255 of 366 days2012: Moderate 97 of 366 days2012: Unhealthy for Sensitive Groups 14 of 366 days20122013: Good 295 of 364 days2013: Moderate 69 of 364 days2014: Good 1 of 1 days2014
  • 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 year0501001998: 90th percentile AQI 971999: 90th percentile AQI 872000: 90th percentile AQI 902001: 90th percentile AQI 802002: 90th percentile AQI 742003: 90th percentile AQI 842004: 90th percentile AQI 572005: 90th percentile AQI 802006: 90th percentile AQI 772007: 90th percentile AQI 712008: 90th percentile AQI 612009: 90th percentile AQI 602010: 90th percentile AQI 632011: 90th percentile AQI 712012: 90th percentile AQI 772013: 90th percentile AQI 572014: 90th percentile AQI 251998: Median AQI 451999: Median AQI 462000: Median AQI 452001: Median AQI 462002: Median AQI 432003: Median AQI 442004: Median AQI 372005: Median AQI 442006: Median AQI 442007: Median AQI 412008: Median AQI 402009: Median AQI 382010: Median AQI 402011: Median AQI 422012: Median AQI 422013: Median AQI 392014: Median AQI 25199820002002200420062008201020122014
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2013

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
Ozone29380%
Fine particles (PM2.5)6919%
Nitrogen dioxide (NO₂)21%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20141100000252525Ozone
2013364295690000395782Ozone
201236625597140004277143Ozone
201136525310390004271147Ozone
2010365283820000406397Ozone
20093632956710003860101Ozone
2008363275880000406197Ozone
200736525910420004171112Ozone
2006363237114120004477140Ozone
2005359228119120004480126Ozone
20043662917410003757115Ozone
2003363216132150004484147Ozone
200236524611090004374129Ozone
2001362217135100004680133Ozone
2000353219111203004590177Ozone
1999361210130183004687159Ozone
199824015070173004597179Ozone

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.

All monitored counties in Kansas

Source: U.S. EPA AirData, “Annual AQI by County” files for 1998–2014 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem