Air Quality in Salt Lake City, Utah — Live

Live readings from PurpleAir sensors across Salt Lake City — with free alerts the moment the air turns.

Live Salt Lake City AQI from nearby PurpleAir sensors loads when this page opens in a browser, along with a live sensor map covering Salt Lake City and West Valley City, Murray, South Salt Lake, Sandy, Bountiful.

Salt Lake City sits in a bowl. The Wasatch Mountains close it on the east, the Oquirrhs on the west, and Traverse Mountain across the south, and the Utah Division of Air Quality says that ring does two things at once: it holds cold air in the valley and it shields the valley from the stronger winds above that would otherwise clear it out. In winter that produces the inversion — cold air pinned under a lid of warmer air, with everything the city emits stuck underneath it. Utah averages about 18 days a year when PM2.5 goes past the national standard, and a typical winter brings five or six multi-day inversion episodes.

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 inversion, and why it does not just blow through

Inversions usually set up after a snowstorm. Snow cover keeps the surface air cold while clear skies warm the layer above it, and when a high-pressure system settles in, sinking warm air caps the valley like a lid over a bowl. Pollution then accumulates day after day with nowhere to go. In January 2026 an inversion held over Salt Lake City for more than a week; on Tuesday 13 January the city ranked worst in the nation for air quality, with the AQI at 123 in the middle of the afternoon and mandatory no-burn restrictions in place.

What you are breathing on those days is mostly not soot straight out of a tailpipe. The Division of Air Quality says secondary ammonium nitrate makes up as much as 70 percent of the particulate mass during an inversion — it forms in the air itself, out of nitrogen oxides, ammonia, sulfur dioxide and organic compounds from vehicles, wood burning, homes and industry. One outside contributor turned out to be unusually large: NOAA research flights in 2017 traced 10 to 25 percent of regional PM2.5 during winter pollution episodes to a single facility, the US Magnesium refinery on the Great Salt Lake, whose chlorine and bromine emissions speed up particle formation. That work was published in early 2023. Regulators have kept the Salt Lake City area on EPA's books as a Serious nonattainment area for the 2006 24-hour PM2.5 standard since 2017, and it was still listed that way as of 30 June 2026.

The lake is drying, and the lakebed blows into town

This one is recent and it is real. Utah's Division of Water Resources reports that more than 800 square miles of Great Salt Lake bed have been exposed as the lake has retreated, with dust becoming a problem where the protective crust has broken down and fine silt and clay are left bare — Farmington Bay and Bear River Bay especially. The agency counts more than 2.66 million people living downwind and names arsenic among the elements of chronic concern in that sediment. On 8 July 2026, thunderstorm outflow winds pushed a visible wall of dust east and south off the lake and across the Salt Lake Valley, with particle pollution running to roughly four times the healthy limit.

Research published in April 2026 by Utah State University and the University of Utah followed the metals further than the air. Leafy vegetables exposed to Great Salt Lake dust held elevated arsenic and uranium even after a thorough wash, and in the team's modelling more than a third of the exposure scenarios for children passed the level of concern for toxic metals. The practical point for anyone with a sensor: a dust event looks like a smoke event on the readout. A PurpleAir monitor counts fine particles, and it will not tell you whether they came off a fire or off the lakebed.

Summer swaps particles for ozone and smoke

The warm half of the year has its own problem. The Northern Wasatch Front — Salt Lake, Davis, Weber and Tooele counties — was designated nonattainment in 2018 under the 2015 ozone standard of 70 parts per billion, was moved up to Moderate, and was reclassified to Serious in December 2024. In April 2026 EPA proposed repealing that reclassification, arguing the area would have met the standard but for emissions transported in from outside the United States and smoke from wildfires. Whichever way that lands, the ozone itself has been stubborn: state researchers note that the fourth-highest 8-hour ozone reading each year has barely moved over the past decade even as nitrogen dioxide fell substantially.

Wildfire smoke sits on top of all of it. A study run in the Salt Lake region in summer 2022, SAMOZA, was designed partly to work out how much smoke was distorting ozone measurements and how much worse pollutant levels ran on smoke days versus clear ones. In practice that means a July afternoon here can be bad for two different reasons at once, and only one of them shows up on a particle sensor.

Salt Lake City air quality FAQ

Why is there smoke in Salt Lake City today?

In summer it is usually wildfire smoke, either from fires burning in Utah or from fires hundreds of miles away in the West that the upper-level winds carry over the valley. In winter, haze that looks like smoke is far more likely to be an inversion: cold air trapped under warm air, holding vehicle exhaust, wood smoke and industrial emissions in the valley for days. And there is a third possibility that is specific to this place. Strong winds off the exposed bed of the Great Salt Lake can push dust across the valley, as they did on 8 July 2026, and on a sensor that dust reads much like smoke.

What is the air quality in Salt Lake City right now?

This page shows the current AQI for Salt Lake City, calculated from PurpleAir sensors around the valley and updated continuously. During an inversion the readings can vary a lot by elevation — the benches up against the Wasatch sometimes sit above the worst of the trapped layer while the valley floor stays in it — so it is worth finding the sensor nearest to you on the map below rather than relying on a single citywide number.

How long does a Salt Lake City inversion usually last?

Days, and sometimes well over a week. Inversions typically form after a snowstorm and hold as long as the high-pressure system above the valley holds. The Utah Division of Air Quality says a typical winter brings roughly five or six multi-day episodes, and Utah averages about 18 days a year when PM2.5 exceeds the national standard. The inversion that settled over the city in January 2026 lasted more than a week before a weather change cleared it.

Is the dust from the Great Salt Lake actually dangerous?

State agencies and university researchers are taking it seriously. Utah's Division of Water Resources says more than 800 square miles of lakebed are now exposed, identifies arsenic among the elements of chronic concern in the sediment, and counts more than 2.66 million people living downwind. Utah State University and University of Utah research published in April 2026 found elevated arsenic and uranium in leafy vegetables exposed to the dust even after washing, and modelled child exposure above levels of concern in more than a third of scenarios. What a home sensor can tell you is when particle levels spike; it cannot tell you what those particles are made of.

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.

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.