Dawson County, Nebraska air quality history

Daily Air Quality Index summaries from EPA monitors in Dawson, Nebraska, 1991–2016.

100%

Good days in 2016

Median daily AQI, 2016

Days above 100 in 2016

Days with an AQI in 2016 (of 366)

In 2016, EPA reported a daily Air Quality Index (AQI) for Dawson, Nebraska on 12 days. 12 of those days (100%) were in the Good range, and the median daily AQI was 14. That median is lower than the typical monitored county in Nebraska (median 37 across 5 counties), and lower than the typical monitored U.S. county (41). The main pollutant was coarse particles (PM10) on 12 days.

EPA did not report an AQI for every day of 2016 here (12 of 366 days). Figures describe monitored days only; seasonal monitoring (for example, ozone measured only in warmer months) can make a county look cleaner or dirtier than a full-year record would.

The most recent year with data for this county is 2016; EPA's files for 2017–2025 contain no row for it, which usually means its monitors stopped reporting.

Years with fewer than 120 monitored days (2011, 2012, 2013, 2014, 2015, 2016…) 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, 2016

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
Coarse particles (PM10)	12	100%

Year-by-year data

Annual AQI summary by year
Year	Days with AQI	Good	Moderate	Median AQI	90th pct.	Max AQI	Main pollutant
2016	12	12	0	14	46	49	PM10
2015	59	57	2	18	39	62	PM10
2014	60	58	2	19	44	58	PM10
2013	60	55	5	19	50	72	PM10
2012	61	50	11	26	56	73	PM10
2011	60	54	6	21	51	93	PM10
2010	58	54	4	19	38	69	PM10
2009	61	59	2	18	38	64	PM10
2008	58	56	2	24	44	58	PM10
2007	57	50	7	26	53	83	PM10
2006	62	50	12	31	54	94	PM10
2005	61	45	16	38	64	87	PM10
2004	61	50	11	33	54	95	PM10
2003	58	48	10	33	58	91	PM10
2002	59	42	17	37	74	96	PM10
2001	61	46	15	34	58	63	PM10
2000	61	42	19	34	64	88	PM10
1999	58	44	14	35	57	94	PM10
1998	62	53	9	28	53	69	PM10
1997	62	55	7	29	51	88	PM10
1996	61	51	10	34	58	73	PM10
1995	57	47	10	27	55	85	PM10
1994	55	51	4	24	47	71	PM10
1993	54	39	15	33	61	80	PM10
1992	55	51	4	23	47	62	PM10
1991	18	15	3	27	59	78	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.

All monitored counties in Nebraska

Source: U.S. EPA AirData, “Annual AQI by County” files for 1991–2016 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem