Henry County, Indiana air quality history

Daily Air Quality Index summaries from EPA monitors in Henry, Indiana, 2000–2025.

70%

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 Henry, Indiana on 365 days. 255 of those days (70%) were in the Good range, and the median daily AQI was 37. That median is lower than the typical monitored county in Indiana (median 41 across 33 counties), and lower than the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 365 days. Across the years with fuller monitoring, the share of Good days rose: an average of 51% in 2011–2014 versus 70% in 2023–2025.

Years with fewer than 120 monitored days (2016, 2018, 2019, 2020, 2021, 2022…) 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)	365	100%

Year-by-year data

Annual AQI summary by year
Year	Days with AQI	Good	Moderate	Unhealthy for Sensitive Groups	Unhealthy	Median AQI	90th pct.	Max AQI	Main pollutant
2025	365	255	110	0	0	37	59	95	PM2.5
2024	361	282	79	0	0	34	55	75	PM2.5
2023	348	214	124	8	2	44	64	192	PM2.5
2022	111	87	24	0	0	34	55	95	PM2.5
2021	117	78	39	0	0	38	62	82	PM2.5
2020	118	87	31	0	0	39	57	67	PM2.5
2019	119	81	38	0	0	37	58	67	PM2.5
2018	116	80	35	1	0	41	60	111	PM2.5
2017	120	86	34	0	0	38	57	66	PM2.5
2016	119	87	32	0	0	37	57	69	PM2.5
2015	121	77	44	0	0	38	61	75	PM2.5
2014	121	66	54	1	0	48	64	119	PM2.5
2013	120	62	58	0	0	49	64	87	PM2.5
2012	119	65	54	0	0	47	65	76	PM2.5
2011	120	56	64	0	0	52	70	93	PM2.5
2010	117	43	73	1	0	55	73	107	PM2.5
2009	118	46	72	0	0	52	67	92	PM2.5
2008	116	44	72	0	0	54	71	87	PM2.5
2007	113	30	82	1	0	58	75	103	PM2.5
2006	111	39	72	0	0	55	76	88	PM2.5
2005	111	24	81	5	1	59	89	157	PM2.5
2004	117	44	73	0	0	55	77	87	PM2.5
2003	117	41	74	2	0	55	82	104	PM2.5
2002	114	27	86	1	0	58	79	124	PM2.5
2001	109	36	71	2	0	58	81	118	PM2.5
2000	13	2	11	0	0	56	68	71	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 Indiana with a similar median AQI in 2025

All monitored counties in Indiana

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