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

2 bad air days a year

Fewer bad air days than most monitored US counties. Ranked 581 of 996 monitored counties, where 1 is worst.

What makes them bad: a mix of particles and ozone (47% particle days).

Which months to watch

Most bad days here fall in June and April 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 record for Medina

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 10 bad days on 363 monitored days.

Date	AQI	Main pollutant
2023-06-28	285	PM2.5
2023-06-29	182	PM2.5
2023-07-17	154	PM2.5
2023-06-07	133	PM2.5
2023-06-27	132	PM2.5

An ordinary day in Medina

Across 3,619 monitored days from 2016 to 2025, the air in Medina County rated Good on 68% of them, less often than the 72% typical of monitored counties, and Moderate on 31%. The median day sat at AQI 43; one day in ten went above 62.

The pollutant setting the AQI on an ordinary day here:

fine particles (PM2.5)58%2,084 days
ozone42%1,535 days

Every recent year on file

Year	Days monitored	Good	Moderate	Over 100	Over 150	Median AQI	Highest AQI
2025*	361	249	110	2	0	43	126
2024	366	236	130	0	0	44	100
2023	363	228	125	10	3	44	285
2022	362	284	76	2	0	41	126
2021	363	250	113	0	0	42	93
2020	360	280	80	0	0	38	93
2019	353	230	123	0	0	44	81
2018	365	240	125	0	0	42	100
2017	364	240	124	0	0	44	100
2016	362	234	127	1	0	44	105
2015	354	129	225	0	0	54	97
2014	261	199	61	1	0	41	105
2013	257	200	57	0	0	41	97
2012	295	160	124	11	1	48	161
2011	283	175	105	3	0	46	129
2010	324	185	133	6	1	48	161

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

Nearby counties on file

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.