Bad Air Days in Outagamie County, Wisconsin: 3 a Year

3 bad air days a year

About the middle of monitored US counties. Ranked 339 of 996 monitored counties, where 1 is worst.

What makes them bad: mostly particles: smoke and dust (67% particle days).

When the bad days come in Outagamie

Most bad days here fall in June and July and August and May. Averaged over 2016 to 2025.

What actually helps here

Bad air days are rare here. A standard furnace filter is enough; no purifier needed for outdoor air.
On the odd bad day, check AirNow and keep windows shut.

Better or worse than it was

In 2000 to 2009 this county averaged 11 bad days a year; in 2016 to 2025, 3. The air has improved. The worst recent year was 2023, with 13 bad days on 360 monitored days.

Date	AQI	Main pollutant
2023-06-28	186	PM2.5
2023-06-27	184	PM2.5
2025-07-31	172	PM2.5
2025-07-30	170	PM2.5
2023-06-29	168	PM2.5

Most days, not the worst ones

Across 3,617 monitored days from 2016 to 2025, the air in Outagamie County rated Good on 70% of them, close to the 72% typical of monitored counties, and Moderate on 29%. The median day sat at AQI 41; one day in ten went above 63.

The pollutant setting the AQI on an ordinary day here:

fine particles (PM2.5)63%2,293 days
ozone37%1,324 days

Year by year

Year	Days monitored	Good	Moderate	Over 100	Over 150	Median AQI	Highest AQI
2025*	365	264	92	9	6	38	172
2024	366	291	75	0	0	37	99
2023	360	195	152	13	5	48	186
2022	365	241	123	1	0	43	122
2021	363	226	134	3	0	44	139
2020	366	254	110	2	0	40	126
2019	365	258	105	2	0	41	119
2018	361	264	96	1	0	42	101
2017	357	280	77	0	0	37	90
2016	349	272	75	2	0	36	108
2015	362	242	120	0	0	43	98
2014	365	196	166	3	0	48	111
2013	365	211	153	1	0	46	105
2012	366	194	160	12	1	49	182
2011	303	198	101	4	0	42	119
2010	261	208	49	4	0	40	108

*2025 may be a partial year in EPA's file.

Elsewhere in Wisconsin

How this is counted

A bad air day is a day the county's daily AQI from EPA AirData went above 100, the level where EPA tells children, older adults and people with asthma or heart disease to cut back outdoors. Monitors do not run every day, so yearly counts are scaled to 365 days. This is the record, not today's air: for that, check AirNow. More on the method in how the county numbers are made, on the AQI 100 line in what counts as a bad air day.