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

1 bad air day a year

Fewer bad air days than most monitored US counties. Ranked 622 of 996 monitored counties, where 1 is worst.

What makes them bad: mostly particles: smoke and dust (62% particle days).

Which months to watch

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

The worst days on file

In 2000 to 2009 this county averaged 25 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
2017-11-26	162	PM2.5
2023-06-28	160	PM2.5
2023-06-29	156	PM2.5
2017-11-27	149	PM2.5
2016-06-14	119	Ozone

An ordinary day in Lawrence

Across 3,637 monitored days from 2016 to 2025, the air in Lawrence County rated Good on 69% of them, close to the 72% typical of monitored counties, and Moderate on 31%. The median day sat at AQI 43; one day in ten went above 59.

The pollutant setting the AQI on an ordinary day here:

fine particles (PM2.5)65%2,375 days
ozone35%1,261 days

Lawrence County by year

Year	Days monitored	Good	Moderate	Over 100	Over 150	Median AQI	Highest AQI
2025*	365	259	106	0	0	42	90
2024	366	264	102	0	0	43	99
2023	365	225	134	6	2	46	160
2022	361	220	141	0	0	45	74
2021	365	210	155	0	0	46	99
2020	354	279	75	0	0	40	77
2019	365	263	102	0	0	43	77
2018	365	271	92	2	0	42	119
2017	365	292	71	2	1	40	162
2016	366	227	136	3	0	46	119
2015	365	187	175	3	0	50	112
2014	365	163	201	1	0	52	103
2013	364	159	204	1	0	52	105
2012	364	136	218	10	1	53	161
2011	364	99	253	12	0	56	126
2010	306	71	221	14	1	59	152

*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.