Bad Air Days in Scioto County, Ohio: under 1 a Year

under 1 bad air day a year

Fewer bad air days than most monitored US counties. Ranked 687 of 996 monitored counties, where 1 is worst.

What makes them bad: mostly particles: smoke and dust (100% particle days).

When the bad days come in Scioto

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

What to buy, and what not to

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.

Better or worse than it was

In 2000 to 2009 this county averaged 4 bad days a year; in 2016 to 2025, under 1. The air has improved. The worst recent year was 2023, with 7 bad days on 365 monitored days.

Date	AQI	Main pollutant
2025-03-06	238	PM10
2023-06-28	172	PM2.5
2023-06-29	160	PM2.5
2023-11-29	136	PM2.5
2016-11-08	129	PM2.5

The air on a normal day

Across 3,653 monitored days from 2016 to 2025, the air in Scioto County rated Good on 83% of them, more often than the 72% typical of monitored counties, and Moderate on 17%. The median day sat at AQI 23; one day in ten went above 50.

The pollutant setting the AQI on an ordinary day here:

coarse dust (PM10)51%1,862 days
fine particles (PM2.5)49%1,791 days

Year by year

Year	Days monitored	Good	Moderate	Over 100	Over 150	Median AQI	Highest AQI
2025*	365	204	159	2	1	46	238
2024	366	248	118	0	0	40	80
2023	365	223	135	7	2	44	172
2022	365	340	25	0	0	17	74
2021	365	333	32	0	0	16	86
2020	366	347	19	0	0	14	93
2019	365	337	28	0	0	14	78
2018	365	338	27	0	0	13	84
2017	365	344	21	0	0	13	70
2016	366	321	44	1	0	15	129
2015	365	319	46	0	0	16	93
2014	365	315	50	0	0	19	89
2013	365	307	58	0	0	19	78
2012	366	300	66	0	0	20	73
2011	365	296	69	0	0	22	94
2010	365	287	78	0	0	24	84

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

Elsewhere in Ohio

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.