Air Quality in Aurora, Colorado — Live
Live readings from sensors across Aurora — including the city's own AIRVIEW network — with free alerts when summer ozone or drifting wildfire smoke push the air past healthy.
AQI 77 from 5 PurpleAir sensors · Trending up · data from PurpleAir
As of , the air quality in Aurora, Colorado is AQI 77 — Moderate and rising — with PM2.5 at 23.1 µg/m³, the median of 5 live PurpleAir sensors reading 76 to 83. Canairy's verdict: Mostly clear.
For scale, that PM2.5 reading is about 1.5 times the World Health Organization's 24-hour guideline of 15 µg/m³. The WHO figure is a daily average and this is a live reading, so read it as a sense of magnitude rather than a formal exceedance — a brief spike and a bad day are not the same thing. More on the WHO guidelines
Pollen today in Aurora: weeds pollen is the strongest of the three at a high level, from Google's pollen forecast. Canairy shows the tree, grass and weed forecast beside the air reading on every plan, including the free one.
Free to download · Live data from PurpleAir & public monitors
Live PurpleAir sensor map for Aurora and Denver, Centennial, Parker, Commerce City. Every dot is a real sensor, color-coded by current air quality.
Sensor by sensor in Aurora
The sensors Canairy reads in Aurora agree right now — all 5 sit in the Moderate band, a 7-point spread — so the city-wide number is a fair description of the whole area today.
| From city center | AQI | Category |
|---|---|---|
| 2.4 mi W | 76 | Moderate |
| 2.5 mi SSE | 77 | Moderate |
| 6.0 mi SSW | 79 | Moderate |
| 7.2 mi SSW | 83 | Moderate |
| 9.9 mi SW | 77 | Moderate |
Aurora's air is fine on most days, but ozone is the real story here, not wildfire smoke. Aurora sits inside the nine-county Denver Metro/North Front Range area that regulators reclassified from "moderate" to "serious" ozone nonattainment in 2024, based on monitoring from 2021 through 2023 that showed the region still isn't meeting the EPA's health standard. On hot, sunny, windless summer afternoons, that shows up as a genuine spike, even under a blue sky.
What Canairy does for Aurora
A clear verdict
Not just a number — a plain-English call for Aurora: open the windows, or keep them shut.
Smoke alerts
A push or text the moment the air crosses your threshold — and again when it clears.
A heads-up before it's bad
Trend alerts catch the air turning, so you can close up the house before the smoke settles in.
Every place you care about
Home, work, the kids' school — across Aurora or across the country, on one screen.
What the air in Aurora is doing next
| When | Expected air quality | Main pollutant |
|---|---|---|
| Today | Good | ozone |
Forecast from EPA AirNow for the Denver-Boulder reporting area. Canairy watches the live sensors against it and tells you when the air actually crosses your threshold, rather than leaving you to check.
Aurora's real air problem is ozone, not smoke
The Denver Metro/North Front Range ozone nonattainment area covers nine counties — Adams, Arapahoe, Boulder, Broomfield, Denver, Douglas, Jefferson, Weld, and part of Larimer — and Aurora sits inside three of them: Arapahoe, Adams, and Douglas. In 2024 the Colorado Department of Public Health and Environment asked the EPA to reclassify the region from "moderate" to "serious" nonattainment for the 2015 ozone standard, based on monitoring data from 2021 through 2023 that still exceeded the federal limit.
Ozone isn't released directly — it forms when vehicle exhaust and vapors from oil and gas wells in the DJ Basin to the north and east cook in strong sunlight. Aurora sits roughly a mile above sea level, where sunlight is more intense, so on hot, calm summer days the same traffic and drilling emissions that would be background noise at lower elevation can push ozone into the range that's rough on kids, older adults, and anyone with asthma.
Aurora built its own air-quality network for a reason
Aurora's Energy & Environment Division runs AIRVIEW, the city's own air-monitoring program — 15 stations spread across every ward, the first government-sponsored network of its kind in the city. The stations track particulate matter, VOCs, ozone, carbon monoxide, and nitrogen dioxide, plus temperature, humidity, and wind, because a single citywide number hides a lot in a city this size.
Aurora covers more than 165 square miles across three counties, from older neighborhoods near the Aurora Mall to newer subdivisions out past E-470 close to Denver International Airport. Traffic on I-225, I-70, and E-470 concentrates pollution differently block by block, which is exactly why Canairy reads sensors near the places you've actually saved instead of one number for the whole city.
When Canadian wildfire smoke does drift in
Aurora doesn't have a local fire season the way California does, but it isn't immune to smoke from far away. In May 2023, smoke from Canadian wildfires pushed into northeastern Colorado hard enough that the state health department issued an air quality health advisory covering 22 counties, including Adams and Arapahoe — Aurora's home counties — and Denver briefly ranked among the worst air quality of any city in the world.
Those events are occasional, not seasonal, and they can arrive with little warning since the source is thousands of miles away. That's the case for watching the numbers rather than the sky: Colorado's clear, sunny weather doesn't always mean the air matches it, whether the cause is imported smoke or a still, hot ozone afternoon.
Aurora air quality FAQ
What is the air quality in Aurora right now?
As of September 15, 2026 at 8:59 AM MDT, the air quality in Aurora, Colorado is AQI 77 — Moderate — with PM2.5 at 23.1 µg/m³, the median of 5 live PurpleAir sensors. Sensitive groups may want to take it slower outside.
Why is ozone Aurora's biggest air-quality problem, not wildfire smoke?
Aurora sits inside the Denver Metro/North Front Range ozone nonattainment area, reclassified "serious" by the EPA in 2024 after monitoring from 2021 through 2023 showed the region still exceeding the federal ozone standard. High elevation intensifies the sunlight that cooks vehicle exhaust and oil-and-gas vapors into ozone, so summer afternoons — not fire season — are when Aurora's air is most likely to cross into unhealthy territory.
Does wildfire smoke ever reach Aurora?
Yes, occasionally. In May 2023, smoke from Canadian wildfires was thick enough over northeastern Colorado that the state issued an air quality health advisory for 22 counties, including Aurora's home counties of Adams and Arapahoe, and Denver briefly had some of the worst air quality of any city in the world. It's an occasional event carried in from far away, not an annual local fire season.
What the AQI numbers mean
| AQI | Category | What it means for you |
|---|---|---|
| 0–50 | Good | Open the windows. Great for outdoor activity. |
| 51–100 | Moderate | Sensitive groups may want to take it slower outside. |
| 101–150 | Unhealthy for Sensitive Groups | Kids, elderly, and respiratory conditions stay closer to home. |
| 151–200 | Unhealthy | Skip outdoor exercise. Close windows. |
| 201–300 | Very Unhealthy | Limit time outside. N95 if you must go. |
| 301+ | Hazardous | Health emergency. Stay inside, run filtration if you have it. |
Canairy lets you tighten these bands if you’re more sensitive than the EPA default, so an alert can fire before the official category changes. How to read the Air Quality Index
Where these readings come from
The AQI at the top of this page is the median of the 5 curated PurpleAir sensors Canairy tracks in and around Aurora, with outliers set aside so that one sensor brought indoors — or parked beside a barbecue — cannot set the number for a whole city. Every sensor behind it is listed above with its distance and bearing from the city center. There is no black box here.
In the app, a place you save resolves the same way first. When no neighborhood sensor is reporting it falls back to the nearest EPA AirNow monitor, and anything modeled rather than measured is labelled a regional estimate rather than passed off as a sensor reading. How low-cost sensors compare to regulatory monitors
About Canairy
Canairy is free to download. The free plan covers one saved place with live readings, a plain-English verdict, and push alerts when the air crosses a threshold you choose. Paid plans add more places, faster refreshes, and SMS alerts. It is built by two parents in Sonoma County, California, who got tired of guessing whether it was safe to send the kids outside. Why we built it
Go deeper
Air quality near Aurora
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