Bad Air Days in Juneau, Alaska: under 1 a Year

under 1 bad air day a year

Rare: among the cleanest-air counties EPA monitors. Ranked 773 of 996 monitored counties, where 1 is worst.

What makes them bad: mostly particles: smoke and dust (100% particle days).

The bad-air season here

Most bad days here fall in July and January and December. 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

The worst recent year was 2019, with 3 bad days on 362 monitored days.

Date	AQI	Main pollutant
2019-07-07	145	PM2.5
2025-01-01	138	PM2.5
2019-07-06	115	PM2.5
2019-07-08	108	PM2.5
2017-01-01	103	PM2.5

The air on a normal day

Across 3,518 monitored days from 2016 to 2025, the air in Juneau rated Good on 83% of them, more often than the 72% typical of monitored counties, and Moderate on 17%. The median day sat at AQI 24; one day in ten went above 57.

The pollutant setting the AQI on an ordinary day here:

fine particles (PM2.5)98%3,454 days
coarse dust (PM10)2%64 days

Every recent year on file

Year	Days monitored	Good	Moderate	Over 100	Median AQI	Highest AQI
2025*	363	306	56	1	23	138
2024	356	304	52	0	24	84
2023	364	314	50	0	24	78
2022	342	291	51	0	21	95
2021	357	315	42	0	20	89
2020	361	320	40	1	19	101
2019	362	280	79	3	27	145
2018	352	268	84	0	31	85
2017	356	281	74	1	20	103
2016	305	224	81	0	27	90
2015	351	262	89	0	28	92
2014	351	251	99	1	31	124
2013	345	280	63	2	25	107
2012	362	277	84	1	28	117
2011	353	253	100	0	31	89
2010	359	231	127	1	35	112

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

Elsewhere in Alaska

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.