Bad Air Days in Wood County, Ohio: 2 a Year

2 bad air days a year

Fewer bad air days than most monitored US counties. Ranked 558 of 996 monitored counties, where 1 is worst.

What makes them bad: mostly ozone: summer smog (0% particle days).

Which months to watch

Most bad days here fall in June and May and July. 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.

The worst days on file

In 2000 to 2009 this county averaged 23 bad days a year; in 2016 to 2025, 2. The air has improved. The worst recent year was 2023, with 4 bad days on 241 monitored days.

Date	AQI	Main pollutant
2023-06-28	126	Ozone
2023-06-29	122	Ozone
2016-05-24	115	Ozone
2018-05-28	115	Ozone
2018-07-10	112	Ozone

An ordinary day in Wood

Across 2,394 monitored days from 2016 to 2025, the air in Wood County rated Good on 87% of them, more often than the 72% typical of monitored counties, and Moderate on 12%. The median day sat at AQI 39; one day in ten went above 55.

The pollutant setting the AQI on an ordinary day here:

ozone100%2,394 days

Wood County by year

Year	Days monitored	Good	Moderate	Over 100	Over 150	Median AQI	Highest AQI
2025*	244	208	35	1	0	39	108
2024	245	203	41	1	0	41	101
2023	241	198	39	4	0	40	126
2022	242	220	22	0	0	38	97
2021	245	216	29	0	0	39	90
2020	229	216	13	0	0	34	80
2019	244	225	19	0	0	38	87
2018	245	213	30	2	0	38	115
2017	245	217	28	0	0	38	97
2016	214	170	41	3	0	41	115
2015	212	188	24	0	0	41	77
2014	214	188	25	1	0	39	101
2013	214	186	28	0	0	39	100
2012	214	145	56	13	1	44	174
2011	214	166	39	9	0	42	129
2010	214	159	53	2	0	44	105

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