Crow Wing County, Minnesota air quality history

Daily Air Quality Index summaries from EPA monitors in Crow Wing, Minnesota, 2000–2025.

78%

Good days in 2025

Median daily AQI, 2025

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 Crow Wing, Minnesota on 365 days. 284 of those days (78%) were in the Good range, and the median daily AQI was 37. That median is about the same as the typical monitored county in Minnesota (median 37 across 21 counties), and lower than the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 212 days. Across the years with fuller monitoring, the share of Good days held roughly steady: an average of 77% in 2004–2006 versus 75% in 2023–2025.

Years with fewer than 120 monitored days (2000, 2001) 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.

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 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.

Pollutant	Days as main pollutant	Share of monitored days
Fine particles (PM2.5)	212	58%
Ozone	153	42%

Year-by-year data

Annual AQI summary by year
Year	Days with AQI	Good	Moderate	Unhealthy for Sensitive Groups	Unhealthy	Very Unhealthy	Median AQI	90th pct.	Max AQI	Main pollutant
2025	365	284	67	9	5	0	37	63	174	PM2.5
2024	366	298	67	1	0	0	38	55	137	PM2.5
2023	365	244	112	8	1	0	43	77	165	PM2.5
2022	365	324	41	0	0	0	37	52	67	Ozone
2021	357	289	63	2	2	1	36	61	246	Ozone
2020	359	338	21	0	0	0	31	45	79	PM2.5
2019	359	324	34	1	0	0	31	50	101	PM2.5
2018	348	292	55	1	0	0	32	57	107	PM2.5
2017	364	306	58	0	0	0	34	54	90	PM2.5
2016	357	313	44	0	0	0	34	52	84	PM2.5
2015	365	299	64	2	0	0	37	55	137	PM2.5
2014	365	309	56	0	0	0	35	55	80	PM2.5
2013	365	316	49	0	0	0	33	53	82	Ozone
2012	360	261	99	0	0	0	39	58	99	PM2.5
2011	350	266	82	2	0	0	41	60	112	PM2.5
2010	330	250	79	1	0	0	39	58	119	PM2.5
2009	360	254	106	0	0	0	40	65	97	PM2.5
2008	363	253	108	2	0	0	42	64	116	PM2.5
2007	351	241	104	6	0	0	40	63	136	PM2.5
2006	342	256	83	3	0	0	38	63	129	PM2.5
2005	328	207	116	4	1	0	44	68	152	PM2.5
2004	179	166	13	0	0	0	37	49	90	Ozone
2001	44	34	9	1	0	0	29	68	122	PM2.5
2000	12	10	1	1	0	0	13	96	103	PM2.5

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 Minnesota with a similar median AQI in 2025

All monitored counties in Minnesota

Source: U.S. EPA AirData, “Annual AQI by County” files for 2000–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem