Bad Air Days in Woodbury County, Iowa

Not enough data

EPA monitors in Woodbury County ran on too few days between 2016 and 2025 to give a fair yearly count (about 42% 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.

The record for Woodbury

The worst recent year was 2023, with 2 bad days on 118 monitored days.

Date	AQI	Main pollutant
2023-05-18	169	PM2.5
2021-07-30	168	PM2.5
2023-09-06	153	PM2.5
2025-06-01	122	Ozone
2025-05-12	101	Ozone

An ordinary day in Woodbury

Across 1,525 monitored days from 2016 to 2025, the air in Woodbury County rated Good on 75% of them, close to the 72% typical of monitored counties, and Moderate on 25%. The median day sat at AQI 40; one day in ten went above 59.

The pollutant setting the AQI on an ordinary day here:

fine particles (PM2.5)72%1,096 days
ozone27%417 days
coarse dust (PM10)1%12 days

Every recent year on file

Year	Days monitored	Good	Moderate	Over 100	Over 150	Median AQI	Highest AQI
2025*	284	226	55	3	0	39	122
2024	284	224	60	0	0	43	93
2023	118	71	45	2	2	43	169
2022	113	91	22	0	0	36	76
2021	115	79	35	1	1	42	168
2020	122	92	30	0	0	39	81
2019	118	91	27	0	0	38	83
2018	122	81	41	0	0	44	93
2017	122	87	35	0	0	37	72
2016	127	96	31	0	0	36	66
2015	121	90	31	0	0	38	99
2014	123	84	37	2	0	39	108
2013	122	79	42	1	0	42	121
2012	123	69	54	0	0	47	92
2011	125	80	45	0	0	43	80
2010	123	69	53	1	0	45	127

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

Iowa 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.