Bad Air Days in Jasper County, Missouri: under 1 a Year

under 1 bad air day a year

Fewer bad air days than most monitored US counties. Ranked 712 of 996 monitored counties, where 1 is worst.

What makes them bad: a mix of particles and ozone (44% particle days).

Which months to watch

Most bad days here fall in June and March and April. Averaged over 2016 to 2025.

What actually helps 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 Jasper

In 2000 to 2009 this county averaged 5 bad days a year; in 2016 to 2025, under 1. The air has improved. The worst recent year was 2023, with 4 bad days on 365 monitored days.

Date	AQI	Main pollutant
2025-03-14	162	PM10
2023-06-06	119	Ozone
2025-04-10	116	PM10
2016-05-05	110	PM10
2023-11-27	110	PM10

Most days, not the worst ones

Across 3,641 monitored days from 2016 to 2025, the air in Jasper County rated Good on 84% of them, more often than the 72% typical of monitored counties, and Moderate on 16%. The median day sat at AQI 38; one day in ten went above 57.

The pollutant setting the AQI on an ordinary day here:

ozone60%2,181 days
coarse dust (PM10)40%1,460 days

Year by year

Year	Days monitored	Good	Moderate	Over 100	Over 150	Median AQI	Highest AQI
2025*	365	305	58	2	1	38	162
2024	366	296	70	0	0	41	99
2023	365	288	73	4	0	42	119
2022	363	283	79	1	0	41	108
2021	360	298	62	0	0	38	93
2020	366	320	46	0	0	35	82
2019	365	324	40	1	0	37	108
2018	365	304	61	0	0	36	95
2017	365	325	40	0	0	36	74
2016	361	319	41	1	0	34	110
2015	365	307	58	0	0	35	98
2014	360	283	76	1	0	38	103
2013	362	303	57	2	0	35	105
2012	327	221	82	24	2	41	154
2011	365	237	107	21	3	43	172
2010	365	273	86	6	0	39	140

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

Missouri compared

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, and on why a purifier does not touch ozone in smoke vs ozone.