Air Quality in Rapid City, South Dakota — Live

Live readings from PurpleAir sensors across Rapid City — with free alerts when west-side dust or Black Hills smoke moves in.

Live Rapid City AQI from nearby PurpleAir sensors loads when this page opens in a browser, along with a live sensor map covering Rapid City and Box Elder, Sturgis, Black Hawk, Piedmont.

Most of the year, Rapid City's air is genuinely good — this isn't a smoggy metro or a smoke-choked valley town. The two real exceptions are geography-specific: winter high-wind dust events on the west side of the city, and the occasional smoky stretch from a Black Hills fire or drifting Canadian wildfire smoke in summer.

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.

Why west Rapid City gets its own dust advisories

Rapid City is split by a low ridge locals call the Gap, and the two sides aren't equal when it comes to air. West of the Gap is where most of the city's quarrying and heavy land-disturbance activity sits, and when strong winds pick up, that exposed soil turns into blowing dust. South Dakota's Department of Agriculture and Natural Resources tracks this under a Natural Events Action Plan written specifically for Rapid City, built to cut PM10 — coarse windblown dust — during high-wind stretches.

These alerts aren't a once-a-decade thing. DANR's own alert history clusters heavily in December and January — 16 alerts in 2021, 10 in 2023 — which lines up with Rapid City's Chinook winds, the warm, dry gusts that roll down off the Black Hills roughly 20 times a winter and can push a January afternoon into the 50s or 60s. When one of those windy stretches is forecast, the city's advisory (fronted publicly by city environmental planner Morgan Twombly) asks construction crews and quarry operators to water down sites and hold off on grading, and asks kids, older adults, and anyone with asthma to plan around it.

Wildfire smoke: Black Hills fires and Canadian drift

The forest around Rapid City burns more often than the city itself. The 2000 Jasper Fire tore through 83,508 acres near Jewel Cave in the southern Black Hills — still the largest wildfire in South Dakota history. The Legion Lake Fire started near Custer State Park in December 2017 and burned close to 54,000 acres, a reminder that Black Hills fire risk isn't confined to summer once conditions turn dry enough.

But the bigger, more frequent source of smoky days in Rapid City in recent years hasn't been a local fire at all — it's been smoke drifting down from Canada. In 2023, Canadian wildfire smoke gave the city hazy skies and moderate AQI readings, part of a pattern the state's own air monitoring flagged as pushing particle pollution higher across South Dakota that fire season.

What to actually do on a bad-air day

If you're on the west side of town, check the air before committing to an afternoon outside in winter — a clear morning can turn hazy by lunch once a Chinook starts moving dust around. If wildfire smoke is the driver instead, close windows early; fine smoke particles get indoors well before the air smells like a campfire.

Canairy reads the sensors near the places you've actually saved instead of one faraway monitor, so you get a number for your side of the Gap, not just downtown. Set your threshold once, and we'll tell you when it's crossed, and when it clears.

Rapid City air quality FAQ

What is the air quality in Rapid City right now?

This page shows the current AQI for Rapid City, calculated from PurpleAir sensors across the city and cross-referenced with state and federal monitors, updated continuously. The map below shows every live sensor, so you can check the reading closest to your own neighborhood — including west of the Gap, where conditions often run different from downtown.

Why does west Rapid City get high-wind dust alerts?

West Rapid City sits across a low ridge called the Gap from downtown and is home to most of the city's quarrying and land-disturbance activity. When strong winds - often the same Chinook gusts that warm South Dakota winters - pick up loose soil on that side of town, the state's Department of Agriculture and Natural Resources issues a dust advisory under its Natural Events Action Plan for Rapid City, a pattern that shows up most winters between December and February.

Does Canadian wildfire smoke reach Rapid City?

Yes. In 2023, smoke drifting down from Canadian wildfires gave Rapid City hazy skies and moderate air quality readings, part of a broader pattern that pushed particle pollution across South Dakota that fire season. Local Black Hills fires, like the 83,508-acre Jasper Fire in 2000, can add to it depending on wind direction.

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 Rapid City data come from?

Readings come from PurpleAir's network of laser particle sensors across Rapid 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.