Stoddard County, Missouri air quality history

Daily Air Quality Index summaries from EPA monitors in Stoddard, Missouri, 2000–2025.

80%

Good days in 2017

Median daily AQI, 2017

Days above 100 in 2017

122

Days with an AQI in 2017 (of 365)

In 2017, EPA reported a daily Air Quality Index (AQI) for Stoddard, Missouri on 122 days. 98 of those days (80%) were in the Good range, and the median daily AQI was 32. That median is lower than the typical monitored county in Missouri (median 42 across 21 counties), and lower than the typical monitored U.S. county (41). The main pollutant was fine particles (PM2.5) on 122 days.

EPA did not report an AQI for every day of 2017 here (122 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.

Years with fewer than 120 monitored days (2020, 2021, 2022, 2023, 2024, 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, 2017

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)	122	100%

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	12	12	0	0	0	21	40	43	PM2.5
2024	113	99	14	0	0	29	54	71	PM2.5
2023	110	79	31	0	0	37	63	98	PM2.5
2022	114	93	21	0	0	31	54	80	PM2.5
2021	109	84	25	0	0	30	56	74	PM2.5
2020	63	54	9	0	0	26	54	66	PM2.5
2019	107	89	18	0	0	31	53	61	PM2.5
2018	117	92	25	0	0	32	55	71	PM2.5
2017	122	98	24	0	0	32	54	66	PM2.5
2016	121	95	26	0	0	32	56	89	PM2.5
2015	119	87	32	0	0	37	56	76	PM2.5
2014	106	68	38	0	0	41	63	71	PM2.5
2013	107	64	43	0	0	44	60	69	PM2.5
2012	114	78	36	0	0	41	58	68	PM2.5
2011	102	58	44	0	0	47	64	79	PM2.5
2010	109	56	52	1	0	49	66	110	PM2.5
2009	105	70	35	0	0	42	62	76	PM2.5
2008	111	59	52	0	0	49	67	85	PM2.5
2007	113	41	70	2	0	54	74	123	PM2.5
2006	122	63	59	0	0	50	65	83	PM2.5
2005	78	29	49	0	0	56	85	99	PM2.5
2004	107	62	45	0	0	45	64	75	PM2.5
2003	118	35	82	1	0	56	75	106	PM2.5
2002	125	41	82	2	0	55	80	108	PM2.5
2001	122	53	68	0	1	53	74	156	PM2.5
2000	58	18	39	1	0	59	83	107	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.

All monitored counties in Missouri

Source: U.S. EPA AirData, “Annual AQI by County” files for 2000–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem