Air Quality in Sioux City, Iowa — Live

Live readings from PurpleAir sensors across Sioux City — with free alerts the moment the air near you turns bad.

Live Sioux City AQI from nearby PurpleAir sensors loads when this page opens in a browser, along with a live sensor map covering Sioux City and Sergeant Bluff, South Sioux City, NE, Dakota Dunes, SD, Le Mars.

Sioux City's air isn't a wildfire story — it's an industrial one. The city grew up around meatpacking, and its worst air days trace back to the plants, rail yards, and truck routes clustered along the Missouri River bottoms rather than to smoke drifting in from somewhere else. Most days the air reads fine on a citywide average, but that average can hide real spikes in the neighborhoods closest to the industrial district.

Canairy watches the sensors around your home, your kids' school, and everywhere else you care about, and tells you in plain English when the air changes enough to matter.

The meatpacking district is the reason Sioux City has an air problem

Sioux City's economy runs on hog and cattle processing — Tyson Fresh Meats and Seaboard Triumph Foods together employ thousands of people at plants clustered south of downtown along the Missouri River. That concentration of heavy processing is also the city's biggest air-quality liability. Iowa's Department of Natural Resources fined Seaboard Triumph Foods $7,000 in March 2025 for 1,920 hours of air-quality violations, after the plant's biogas flaring system repeatedly released hydrogen sulfide above its permitted limit — a February 2024 reading hit 12,089 parts per million, more than three times the 4,000 ppm cap.

DNR records show the company had been out of compliance since at least 2018, missing required monitoring equipment and failing to keep the records that would have caught the problem sooner. It's the kind of slow-moving industrial issue that doesn't make headlines the way a wildfire does, but for people living and working near the plant, it shows up as a persistent, foul-smelling gas that state regulators only formally penalized years after it started.

A grassroots sensor network found spikes the state's own monitors were missing

In summer 2025 the Iowa Environmental Council placed six PurpleAir monitors around Woodbury County, with two inside Sioux City on Geneva Street and Market Street — both areas the group flagged for already-high rates of asthma and respiratory illness. Around July 14, 2025, those monitors averaged PM2.5 readings of 153 to 154, well into the range that's unhealthy for sensitive groups, in neighborhoods within a few miles of the meatpacking district, area concrete plants, and coal-fired generation.

The council's broader finding was arguably more telling than any single spike: Woodbury County's air pollution rose about 15% over the prior decade, while similarly sized Iowa counties with just as much or more industry — Linn and Polk — showed no comparable increase. Iowa's official monitoring network is sparse enough that this kind of neighborhood-level spike had gone largely undocumented until residents started running their own sensors.

The valley and the tri-state traffic corridor add to the mix

Sioux City sits at the bottom of the Missouri River valley, pinned between the loess bluffs to the east and the river itself, at the point where Iowa, Nebraska, and South Dakota meet. That low, flat river-bottom setting is exactly where the meatpacking plants, rail yards, and grain and fertilizer handling facilities were built, and it's also where the interstate routes — I-29 running north-south and I-129 crossing into Nebraska — funnel a steady stream of truck traffic serving that same industry.

On calm days, the valley floor doesn't clear pollutants the way open, breezy terrain would, so emissions from the processing plants and the truck corridor that serves them tend to settle rather than disperse. It's a different mechanism than the West Coast's fire-driven smoke events, but the practical effect for anyone living in Riverside, the Bridgeport neighborhoods, or the areas closest to the stockyards is the same: air quality that can swing worse than the citywide number suggests.

Sioux City air quality FAQ

What is the air quality in Sioux City right now?

This page shows the current AQI for Sioux City, calculated from PurpleAir sensors across the city and updated continuously. The map below shows every live sensor, so you can check the reading closest to your own neighborhood, including areas near the meatpacking district where readings can run higher than the citywide average.

Why does Sioux City have air quality problems?

Unlike many Canairy cities, Sioux City's air issues aren't about wildfire smoke — they trace back to the meatpacking district south of downtown. Iowa's DNR fined Seaboard Triumph Foods in March 2025 for nearly 2,000 hours of air-quality violations tied to hydrogen sulfide releases, and a 2025 Iowa Environmental Council sensor network recorded PM2.5 spikes above 150 in neighborhoods near the plants, concrete facilities, and coal-fired generation.

Is Woodbury County's air pollution actually getting worse?

According to Iowa Environmental Council monitoring, Woodbury County's air pollution rose roughly 15% over the past decade, while similarly sized Iowa counties like Linn and Polk — with comparable or greater industry — did not see the same increase. That's part of why local advocates pushed for the additional PurpleAir sensors placed around Sioux City in 2025.

What AQI level is unhealthy?

Under the US EPA scale, AQI 0-50 is Good and 51-100 is Moderate. From 101 the air is Unhealthy for Sensitive Groups - kids, older adults, and people with asthma or heart conditions - and above 150 it's Unhealthy for everyone. Canairy translates these numbers into a plain-English verdict, like whether to close the windows or move a workout indoors.

Where does Canairy's Sioux City data come from?

Readings come from PurpleAir's network of laser particle sensors across Sioux City and surrounding towns, cross-referenced with government monitors and the Google Air Quality API. You can see every sensor behind your numbers on the live map - there's no black box.

Is Canairy free?

Yes. The Canairy app is free to download and includes live air quality for all your saved places, plain-English verdicts, and free push alerts when the air crosses your threshold. A paid plan adds extras like SMS text alerts.

Get Canairy free on Google Play.