Bad Air Days in Harrison County, West Virginia

Not enough data

EPA monitors in Harrison County ran on too few days between 2016 and 2025 to give a fair yearly count (about 31% of days covered). Neighbouring counties below are a better guide.

What actually helps here

EPA monitors here ran too few days to give a fair yearly count. Use AirNow for today's air.

Better or worse than it was

The worst recent year was 2023, with 1 bad day on 107 monitored days.

Date	AQI	Main pollutant
2023-06-29	166	PM2.5
2023-07-17	81	PM2.5
2020-07-05	80	PM2.5
2023-06-17	77	PM2.5
2023-06-08	74	PM2.5

Most days, not the worst ones

Across 1,149 monitored days from 2016 to 2025, the air in Harrison County rated Good on 76% of them, more often than the 72% typical of monitored counties, and Moderate on 24%. The median day sat at AQI 37; one day in ten went above 56.

The pollutant setting the AQI on an ordinary day here:

fine particles (PM2.5)100%1,149 days

Harrison County by year

Year	Days monitored	Good	Moderate	Over 100	Over 150	Median AQI	Highest AQI
2025*	116	84	32	0	0	33	68
2024	113	91	22	0	0	34	60
2023	107	82	24	1	1	39	166
2022	113	93	20	0	0	34	69
2021	115	82	33	0	0	35	69
2020	118	99	19	0	0	35	80
2019	111	84	27	0	0	41	64
2018	117	88	29	0	0	36	65
2017	122	88	34	0	0	40	71
2016	117	78	39	0	0	41	66
2015	116	65	51	0	0	46	86
2014	120	68	52	0	0	44	76
2013	119	71	48	0	0	46	73
2012	115	56	59	0	0	51	86
2011	83	41	42	0	0	51	80
2010	111	39	71	1	0	56	117

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

West Virginia compared

Ohio County1/yr
Berkeley County1/yr
Hancock Countyunder 1/yr
Wood Countyunder 1/yr
Marshall Countyunder 1/yr
Kanawha Countyunder 1/yr
Cabell Countyunder 1/yr
Brooke Countyunder 1/yr

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.