Air quality in Trego County, KS

Q: How often is the air bad in Trego County?

From 2021 to 2025, monitors in Trego County recorded about 4 bad-air days a year with an AQI above 100, which is unhealthy for sensitive groups or worse. The worst year in that stretch was 2021, with 6 bad-air days.

Q: What causes bad air in Trego County?

Bad days here come from both fine particles such as smoke and blowing dust. Bad days cluster in April, August and September.

Q: Where can I see today's air quality in Trego County?

AirNow, run by the EPA and its partners, shows the current AQI and tomorrow's forecast for your ZIP code. Its fire and smoke map adds smoke plumes. On a typical day the AQI in Trego County is about 43, which is good, fine for everyone. Check it most in April, August and September, when bad days here cluster.

EPA monitor readings, 2021 to 2025 · 3,000 people

A few bad days a yearFine particles and dust

For today's air and tomorrow's forecast, check AirNow by ZIP code.

Bad-air days a year

days with an AQI over 100

19 bad-air days in 5 years of readings, 2021 to 2025. That's down from about 8 a year in the early 2000s. Trego County has the 2nd most bad-air days of the 10 Kansas counties with monitors.

<1day unhealthy for everyoneAQI over 150, a year

43AQI on a typical dayGood: fine for everyone

Apr, Aug and Sepworst monthsFine particles and dust

318worst day since 2016Dec 15, 2021, dust

How to read the AQIThe EPA's air score runs from 0 to 500. Higher is worse. Over 100 counts as a bad-air day.

Typical day 43 (Good)Worst day 318 (Hazardous)

Good0 to 50Moderate51 to 100Sensitive groups101 to 150Unhealthy151 to 200Very unhealthy201 to 300Hazardous301 to 500

When bad air happens in Trego County

Average bad-air days in each month, from 10 years of daily readings since 2016. Most fall in April, August and September.

Jan0

Feb0

Mar0

Apr0.4

May0

Jun0.1

Jul0.2

Aug0.4

Sep0.4

Oct0.2

Nov0

Dec0.2

Fine particles (smoke, soot)Dust (coarse particles)Ozone (smog)Bars stack in that order, from the bottom.

See the numbers by month

Average bad-air days a year in each month in Trego County, from 10 years of daily readings
Month	Ozone	Fine particles	Dust	All
January	0	0	0	0
February	0	0	0	0
March	0	0	0	0
April	0	0.1	0.3	0.4
May	0	0	0	0
June	0.1	0	0	0.1
July	0.2	0	0	0.2
August	0	0.4	0	0.4
September	0.1	0.3	0	0.4
October	0	0	0.2	0.2
November	0	0	0	0
December	0	0	0.2	0.2

The worst day since 2016 was December 15, 2021: AQI 318, from dust and coarse particles.

What causes it

The pollutant that pushed the AQI over 100 on each of the 21 bad-air days since 2016.

19%Ozone: smog that forms in sunlight on hot days

38%Fine particles: smoke and soot

33%Dust: coarse particles blown up by wind

10%Other gases, such as nitrogen dioxide

Bad days here come from both fine particles such as smoke and blowing dust.

CDC estimates by month, 2001 to 2022

The CDC's model counts bad-air days at the county's worst spot, from monitors and satellites. Particles (brown) fill the inside of the ring and ozone (blue) the outside.

See it on the map Compare with Ellis County Smoke or smog?

See the numbers by month

CDC estimated bad-air days a year in each month in Trego County, 2001 to 2022
Month	Fine particles	Ozone
January	0	0
February	0	0
March	0	0
April	0	0
May	0	0
June	0	0.5
July	0	0.2
August	0.1	0.3
September	0	0
October	0	0
November	0	0
December	0	0

What helps in Trego County

Bad days here come from fine particles and dust. Filtering the air at home helps with both.

Keep one room clean on smoky days

Shut the windows and run an air purifier sized for the room.

Choosing a purifier →

Upgrade the furnace filter

Use MERV 13 if your system can take it, and run the fan on smoky days.

Furnace filters →

Watch for wind and dust warnings

Dust days come with wind. When the forecast calls for high wind or the Weather Service posts a dust warning, plan to stay in.

AirNow →

For today's reading and tomorrow's forecast, check AirNow by ZIP code. Its fire and smoke map adds smoke plumes.

Purifiers with a verified smoke rating

For a clean room on smoky days. Each has a smoke CADR tested by AHAM's independent program and is certified by California as a mechanical cleaner, so it makes no ozone.

Bedroom or small room

Levoit Vital 100S-P

143 smoke CADR

Everyday: up to 222 sq ft
Heavy smoke: up to 143 sq ft
Filters: about $40 a year

The cheapest unit we found with a verified smoke rating. Enough for a bedroom clean room.

$119.99 at Levoit

Best value for smoke

Levoit Vital 200S-P

250 smoke CADR

Everyday: up to 388 sq ft
Heavy smoke: up to 250 sq ft
Filters: about $50 a year

The most verified smoke cleaning per dollar of any qualifying model: 75% more than the 100S-P for $50 more.

$169.99 at Levoit

Living room or open floor

Levoit Core 600S-P

391 smoke CADR

Everyday: up to 606 sq ft
Heavy smoke: up to 391 sq ft
Filters: $60 to $120 a year

For a big room or a small apartment. Buy the LAP-C601S-WUS version, which CARB lists as mechanical.

$299.99 at Levoit

Why all 3 are Levoit: of the models we checked that pass both tests, these give the most verified smoke cleaning per dollar at each room size. Medify's MA-25 and MA-40 also pass but cost more for the same cleaning.

Ratings from the AHAM Verifide directory and CARB's certified list. Prices from Levoit's site, checked November 7, 2026; they change. We don't earn anything from these links. How to pick a purifier

Every year since 2000

Bad-air days each year. The striped part is days unhealthy for everyone, over AQI 150. The worst recent year was 2021, with 6 bad-air days.

Unhealthy for sensitive groups (101 to 150)Unhealthy or worse (over 150)

See the numbers by year

Bad-air days each year in Trego County
Year	Bad-air days	Over 150
2000	18	1
2001	14	0
2002	1	0
2003	1	0
2004	4	0
2005	6	0
2006	19	0
2007	1	0
2008	0	0
2009	1	0
2010	4	0
2011	11	0
2012	13	0
2013	0	0
2014	0	0
2015	1	0
2016	0	0
2017	0	0
2018	1	0
2019	0	0
2020	1	0
2021	6	1
2022	3	1
2023	5	1
2024	4	0
2025	1	0

Trego County and its neighbors

Bad-air days a year, 2021 to 2025. Kansas counties with monitors averaged about 4 bad-air days a year, weighted by population.

Trego County4

Nearest counties with a full report: Sedgwick County, KS (4 bad-air days a year), Hall County, NE (1 bad-air day a year).

Questions people ask about air in Trego County

How often is the air bad in Trego County?

From 2021 to 2025, monitors in Trego County recorded about 4 bad-air days a year with an AQI above 100, which is unhealthy for sensitive groups or worse. The worst year in that stretch was 2021, with 6 bad-air days.

What causes bad air in Trego County?

Bad days here come from both fine particles such as smoke and blowing dust. Bad days cluster in April, August and September.

Where can I see today's air quality in Trego County?

AirNow, run by the EPA and its partners, shows the current AQI and tomorrow's forecast for your ZIP code. Its fire and smoke map adds smoke plumes. On a typical day the AQI in Trego County is about 43, which is good, fine for everyone. Check it most in April, August and September, when bad days here cluster.

About these numbers

Day counts come from the EPA's county air quality summaries, which take the worst reading across a county's monitors each day. Monitors here reported on about 363 days a year from 2021 to 2025. A county is large, and your street can be cleaner or worse. CDC's model, which estimates every county from monitors and satellites, gives the worst spot in Trego County almost no high-particle days and almost no high-ozone days a year from 2018 to 2022.

Sources: EPA AirData county AQI summaries (2000 to 2025) and daily county AQI (2016 to 2025); CDC Environmental Public Health Tracking Network modeled PM2.5 and ozone (2001 to 2022). Updated November 8, 2026.