Hall County, Nebraska air quality history

Daily Air Quality Index summaries from EPA monitors in Hall, Nebraska, 1994–2025.

82%

Good days in 2025

Median daily AQI, 2025

Days above 100 in 2025

337

Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Hall, Nebraska on 337 days. 278 of those days (82%) were in the Good range, and the median daily AQI was 34. That median is about the same as the typical monitored county in Nebraska (median 34 across 10 counties), and lower than the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 215 days. Across the years with fuller monitoring, the share of Good days held roughly steady: an average of 79% in 2014–2021 versus 78% in 2023–2025.

Years with fewer than 120 monitored days (2013, 2015, 2016, 2017, 2018, 2019…) 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)	215	64%
Ozone	122	36%

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	337	278	57	2	0	34	54	118	PM2.5
2024	323	248	75	0	0	32	56	80	PM2.5
2023	342	251	88	0	3	35	58	190	PM2.5
2022	350	301	49	0	0	27	53	84	PM2.5
2021	357	268	87	2	0	34	58	134	PM2.5
2020	338	296	42	0	0	26	53	87	PM2.5
2019	97	87	10	0	0	25	51	64	PM2.5
2018	111	92	19	0	0	30	54	72	PM2.5
2017	111	92	19	0	0	31	52	64	PM2.5
2016	113	102	11	0	0	29	49	59	PM2.5
2015	115	98	17	0	0	32	53	83	PM2.5
2014	120	91	29	0	0	32	55	77	PM2.5
2013	114	83	31	0	0	36	62	79	PM2.5
2012	119	82	37	0	0	40	59	74	PM2.5
2011	119	92	27	0	0	37	57	69	PM2.5
2010	113	86	27	0	0	35	57	79	PM2.5
2009	118	95	23	0	0	34	58	75	PM2.5
2008	109	74	35	0	0	36	59	69	PM2.5
2007	111	74	37	0	0	41	63	77	PM2.5
2006	119	85	34	0	0	35	58	71	PM2.5
2005	113	78	35	0	0	37	62	78	PM2.5
2004	106	70	36	0	0	42	63	82	PM2.5
2003	111	64	47	0	0	43	63	92	PM2.5
2002	114	83	31	0	0	33	61	85	PM2.5
2001	106	68	37	1	0	43	60	102	PM2.5
2000	110	66	43	1	0	41	67	112	PM2.5
1999	73	40	33	0	0	44	67	97	PM2.5
1995	25	25	0	0	0	17	25	39	PM10
1994	29	29	0	0	0	19	38	44	PM10

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 Nebraska with a similar median AQI in 2025

All monitored counties in Nebraska

Source: U.S. EPA AirData, “Annual AQI by County” files for 1994–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem