Bad Air Days in Campbell County, Kentucky: 2 a Year

2 bad air days a year

About the middle of monitored US counties. Ranked 471 of 996 monitored counties, where 1 is worst.

What makes them bad: mostly ozone: summer smog (23% particle days).

When the bad days come in Campbell

Most bad days here fall in June and September. 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.

The record for Campbell

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 6 bad days on 360 monitored days.

Date	AQI	Main pollutant
2023-06-28	187	PM2.5
2023-06-27	154	PM2.5
2023-06-29	137	PM2.5
2023-06-07	126	PM2.5
2025-09-19	122	Ozone

Most days, not the worst ones

Across 3,618 monitored days from 2016 to 2025, the air in Campbell County rated Good on 64% of them, less often than the 72% typical of monitored counties, and Moderate on 36%. The median day sat at AQI 44; one day in ten went above 61.

The pollutant setting the AQI on an ordinary day here:

fine particles (PM2.5)67%2,427 days
ozone32%1,146 days
nitrogen dioxide1%45 days

Campbell County by year

Year	Days monitored	Good	Moderate	Over 100	Over 150	Median AQI	Highest AQI
2025*	365	276	85	4	0	39	122
2024	366	285	78	3	0	40	108
2023	360	234	120	6	2	44	187
2022	362	246	115	1	0	43	105
2021	362	230	131	1	0	44	101
2020	366	246	120	0	0	43	93
2019	362	241	120	1	0	44	108
2018	350	206	143	1	0	45	101
2017	362	176	184	2	0	51	115
2016	363	160	200	3	0	52	115
2015	364	174	184	6	0	51	129
2014	364	192	168	4	0	49	112
2013	365	199	162	4	0	48	129
2012	364	163	180	21	2	52	201
2011	365	126	225	14	0	55	147
2010	364	164	193	7	0	52	133

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

Kentucky compared

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.