Bad Air Days in Hall County, Nebraska: 1 a Year

1 bad air day a year

Fewer bad air days than most monitored US counties. Ranked 674 of 996 monitored counties, where 1 is worst.

What makes them bad: mostly particles: smoke and dust (100% particle days).

Which months to watch

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

Is a purifier worth it 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.

The record for Hall

The worst recent year was 2023, with 3 bad days on 342 monitored days.

Date	AQI	Main pollutant
2023-05-18	190	PM2.5
2023-09-06	163	PM2.5
2023-09-07	153	PM2.5
2021-07-31	134	PM2.5
2025-08-01	118	PM2.5

An ordinary day in Hall

Across 2,479 monitored days from 2016 to 2025, the air in Hall County rated Good on 81% of them, more often than the 72% typical of monitored counties, and Moderate on 18%. The median day sat at AQI 31; one day in ten went above 55.

The pollutant setting the AQI on an ordinary day here:

fine particles (PM2.5)95%2,357 days
ozone5%122 days

Year by year

Year	Days monitored	Good	Moderate	Over 100	Over 150	Median AQI	Highest AQI
2025*	337	278	57	2	0	34	118
2024	323	248	75	0	0	32	80
2023	342	251	88	3	3	35	190
2022	350	301	49	0	0	27	84
2021	357	268	87	2	0	34	134
2020	338	296	42	0	0	26	87
2019	97	87	10	0	0	25	64
2018	111	92	19	0	0	30	72
2017	111	92	19	0	0	31	64
2016	113	102	11	0	0	29	59
2015	115	98	17	0	0	32	83
2014	120	91	29	0	0	32	77
2013	114	83	31	0	0	36	79
2012	119	82	37	0	0	40	74
2011	119	92	27	0	0	37	69
2010	113	86	27	0	0	35	79

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

Elsewhere in Nebraska

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.