Bad Air Days in Mahoning County, Ohio: 1 a Year

1 bad air day a year

Fewer bad air days than most monitored US counties. Ranked 620 of 996 monitored counties, where 1 is worst.

What makes them bad: mostly particles: smoke and dust (77% particle days).

When the bad days come in Mahoning

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

Is a purifier worth it 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.

Better or worse than it was

In 2000 to 2009 this county averaged 21 bad days a year; in 2016 to 2025, 1. The air has improved. The worst recent year was 2023, with 6 bad days on 365 monitored days.

Date	AQI	Main pollutant
2023-06-28	226	PM2.5
2023-06-29	186	PM2.5
2023-07-17	152	PM2.5
2020-07-05	142	PM2.5
2022-06-21	129	Ozone

Most days, not the worst ones

Across 3,624 monitored days from 2016 to 2025, the air in Mahoning County rated Good on 62% of them, less often than the 72% typical of monitored counties, and Moderate on 37%. The median day sat at AQI 45; one day in ten went above 62.

The pollutant setting the AQI on an ordinary day here:

fine particles (PM2.5)74%2,678 days
ozone26%946 days

Every recent year on file

Year	Days monitored	Good	Moderate	Over 100	Over 150	Median AQI	Highest AQI
2025*	363	230	131	2	0	44	122
2024	361	239	122	0	0	44	93
2023	365	187	172	6	3	49	226
2022	349	214	132	3	0	46	129
2021	365	205	159	1	0	47	110
2020	365	251	113	1	0	43	142
2019	360	232	128	0	0	46	84
2018	365	242	123	0	0	43	90
2017	365	237	128	0	0	44	80
2016	366	222	144	0	0	45	78
2015	363	192	170	1	0	49	112
2014	363	154	208	1	0	52	114
2013	360	152	207	1	0	53	119
2012	366	144	212	10	2	53	169
2011	365	138	220	7	0	54	140
2010	365	126	232	7	0	55	140

*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.