Jackson County, Colorado air quality history

Daily Air Quality Index summaries from EPA monitors in Jackson, Colorado, 1994–2025.

84%

Good days in 2024

Median daily AQI, 2024

Days above 100 in 2024

364

Days with an AQI in 2024 (of 366)

In 2024, EPA reported a daily Air Quality Index (AQI) for Jackson, Colorado on 364 days. 304 of those days (84%) were in the Good range, and the median daily AQI was 44. That median is lower than the typical monitored county in Colorado (median 47.5 across 30 counties), and higher than the typical monitored U.S. county (41). The main pollutant was ozone on 348 days. Across the years with fuller monitoring, the share of Good days fell: an average of 93% in 2011–2013 versus 85% in 2022–2024.

Years with fewer than 120 monitored days (2017, 2018, 2019, 2020, 2021, 2025…) 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, 2024

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
Ozone	348	96%
Fine particles (PM2.5)	13	4%
Coarse particles (PM10)	3	1%

Year-by-year data

Annual AQI summary by year
Year	Days with AQI	Good	Moderate	Unhealthy for Sensitive Groups	Median AQI	90th pct.	Max AQI	Main pollutant
2025	89	88	1	0	9	26	56	PM2.5
2024	364	304	57	3	44	58	105	Ozone
2023	365	289	75	1	45	58	108	Ozone
2022	236	216	20	0	40	49	71	Ozone
2021	116	109	7	0	7	44	90	PM2.5
2020	81	73	8	0	7	41	85	PM2.5
2019	102	102	0	0	8	17	34	PM2.5
2018	116	113	3	0	9	27	64	PM2.5
2017	117	115	1	1	7	24	110	PM2.5
2016	115	114	1	0	8	19	53	PM2.5
2015	363	345	18	0	38	47	93	Ozone
2014	363	341	22	0	40	48	77	Ozone
2013	363	324	38	1	42	51	112	Ozone
2012	363	329	34	0	40	50	72	Ozone
2011	161	161	0	0	30	40	44	Ozone
2010	111	111	0	0	9	16	47	PM2.5
2009	119	117	2	0	9	22	87	PM2.5
2008	115	114	1	0	12	24	67	PM2.5
2007	115	115	0	0	11	26	50	PM2.5
2006	112	112	0	0	10	24	37	PM2.5
2005	114	114	0	0	9	22	32	PM2.5
2004	110	110	0	0	9	19	34	PM2.5
2003	113	113	0	0	11	24	44	PM2.5
2002	97	97	0	0	8	21	33	PM2.5
2001	119	118	1	0	11	27	65	PM2.5
2000	65	63	2	0	13	26	55	PM2.5
1999	95	94	1	0	12	22	82	PM2.5
1998	88	88	0	0	13	27	45	PM2.5
1997	101	101	0	0	13	22	42	PM2.5
1996	94	93	1	0	13	29	53	PM2.5
1995	90	90	0	0	11	27	41	PM2.5
1994	36	35	1	0	11	34	52	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 Colorado with a similar median AQI in 2024

All monitored counties in Colorado

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