Eagle County, Colorado air quality history

Daily Air Quality Index summaries from EPA monitors in Eagle, Colorado, 1985–2001.

100%

Good days in 1995

Median daily AQI, 1995

Days above 100 in 1995

142

Days with an AQI in 1995 (of 365)

In 1995, EPA reported a daily Air Quality Index (AQI) for Eagle, Colorado on 142 days. 142 of those days (100%) were in the Good range, and the median daily AQI was 15. That median is lower than the typical monitored county in Colorado (median 38 across 22 counties), and lower than the typical monitored U.S. county (39). The main pollutant was coarse particles (PM10) on 142 days. Across the years with fuller monitoring, the share of Good days rose: an average of 91% in 1986–1988 versus 100% in 1993–1995.

EPA did not report an AQI for every day of 1995 here (142 of 365 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 2001; EPA's files for 2002–2025 contain no row for it, which usually means its monitors stopped reporting.

Years with fewer than 120 monitored days (1996, 1997, 1998, 1999, 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, 1995

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)	142	100%

Year-by-year data

Annual AQI summary by year
Year	Days with AQI	Good	Moderate	Median AQI	90th pct.	Max AQI	Main pollutant
2001	22	22	0	12	19	33	PM10
2000	45	45	0	11	20	32	PM10
1999	49	49	0	10	24	36	PM10
1998	43	42	1	12	19	70	PM10
1997	41	41	0	10	18	41	PM10
1996	99	98	1	15	27	62	PM10
1995	142	142	0	15	22	37	PM10
1994	130	130	0	14	28	40	PM10
1993	140	138	2	18	32	73	PM10
1992	135	135	0	17	30	45	PM10
1991	143	141	2	17	33	76	PM10
1990	143	142	1	18	33	51	PM10
1989	152	150	2	19	33	52	PM10
1988	173	173	0	18	33	49	PM10
1987	135	118	17	24	54	80	PM10
1986	180	155	25	19	62	81	PM10
1985	4	4	0	19	21	21	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 Colorado

Source: U.S. EPA AirData, “Annual AQI by County” files for 1985–2001 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem