Air Quality in Lakewood, Colorado — Live
Live readings from PurpleAir sensors across Lakewood — with free alerts when ozone or smoke moves in.
AQI 1 from 5 PurpleAir sensors · Trending down · data from PurpleAir
As of , the air quality in Lakewood, Colorado is AQI 1 — Good and falling — with PM2.5 at 0.3 µg/m³, the median of 5 live PurpleAir sensors reading 0 to 14. Canairy's verdict: Breathe easy.
For scale, that PM2.5 reading is below 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 Lakewood: weeds pollen is the strongest of the three at a very 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 Lakewood and Golden, Wheat Ridge, Morrison, Edgewater. Every dot is a real sensor, color-coded by current air quality.
Sensor by sensor in Lakewood
The sensors Canairy reads in Lakewood agree right now — all 5 sit in the Good band, a 14-point spread — so the city-wide number is a fair description of the whole area today.
| From city center | AQI | Category |
|---|---|---|
| 2.5 mi NNW | 3 | Good |
| 2.5 mi WNW | 1 | Good |
| 3.3 mi WSW | 0 | Good |
| 4.2 mi NW | 2 | Good |
| 5.6 mi NE | 14 | Good |
Most of the year, Lakewood's air is unremarkable — clean enough that it doesn't make the local news. The exception is summer, when Lakewood shares in one of the most persistent ozone problems in the country: Jefferson County sits inside the Denver Metro/North Front Range area, which the EPA classifies as a "Severe" ozone nonattainment zone. On hot, sunny, windless days from late May through August, the air quality advisory that covers the whole Front Range corridor covers Lakewood too — Jefferson County's own alert system was still flagging one as this page was written, extended through August 1, 2026.
What Canairy does for Lakewood
A clear verdict
Not just a number — a plain-English call for Lakewood: 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 Lakewood or across the country, on one screen.
Lakewood sits inside Colorado's toughest ozone category
Jefferson County, and Lakewood with it, is part of the Denver Metro/North Front Range ozone nonattainment area — a designation the EPA bumped from Moderate to Serious in December 2019 after the region missed its federal deadline, then bumped again to Severe in October 2022. The area now has until July 20, 2027 to meet the federal 8-hour ozone standard, and Denver has repeatedly ranked among the American Lung Association's most ozone-polluted metro areas in the country.
Ozone isn't smoke from a single source — it forms when tailpipe exhaust and oil-and-gas emissions from across the Front Range react with strong sun. Lakewood's elevation, higher even than downtown Denver's mile-high mark at 5,656 feet, means more intense UV to drive that chemistry, and the metro area's heavy car dependence supplies the raw material every day of ozone season.
The mountains recirculate the same polluted air over the foothills
NASA and NOAA field campaigns based in the Front Range (FRAPPE and DISCOVER-AQ) tracked something specific to this geography: daytime heating pushes polluted air up against the mountains, and as the ground cools in the evening that same air drifts back down over the foothill communities it came from, instead of clearing out. Lakewood sits almost exactly where the plains meet that foothill band, near Green Mountain and the edge of the Rockies.
That pattern shows up in real advisories, not just research papers. The Jefferson County alert extended through August 1, 2026 specifically warned that the highest ozone concentrations were expected "in the western portions of the northern Colorado Front Range, including the lower foothills" — a description that fits Lakewood's own address about as closely as a forecast can.
Ozone season is summer; winter brings back the old "brown cloud"
CDPHE runs daily ozone notifications from May 31 through August 31 each year, and Lakewood shares whatever number the Front Range corridor reports, since ozone drifts across city lines rather than respecting them. The clearest stretches tend to come with a steady wind off the mountains; the worst build over days of hot, calm, sunny weather, which is exactly the pattern behind the advisory still in effect as this was written.
Winter brings a different, older problem: the visible haze Denver-area residents have called the "brown cloud" since at least the 1970s, when cold air pools in the South Platte valley and traps vehicle exhaust and wood smoke close to the ground until a storm or strong wind scours it out. Wildfire smoke — from Colorado's own Front Range fires and occasionally from fires as far away as Canada or Nebraska — can also settle over Lakewood in a bad summer, layering on top of the ozone problem rather than replacing it.
Lakewood air quality FAQ
What is the air quality in Lakewood right now?
As of September 14, 2026 at 6:10 AM MDT, the air quality in Lakewood, Colorado is AQI 1 — Good — with PM2.5 at 0.3 µg/m³, the median of 5 live PurpleAir sensors. Open the windows. Great for outdoor activity.
Why does Lakewood get ozone advisories in summer?
Jefferson County sits inside the Denver Metro/North Front Range area, which the EPA has classified "Severe" nonattainment for ozone — the toughest category on the Front Range. Hot, sunny, calm days from late May through August let tailpipe and oil-and-gas emissions cook into ozone in strong sun, and Lakewood's foothill-edge location is close to where Jefferson County and the National Weather Service have flagged the highest concentrations landing.
What is Denver's "brown cloud"?
It's the visible haze that has settled over the Denver metro area since at least the 1970s, most often in winter, when cold, still air pools in the South Platte valley and traps vehicle exhaust and wood smoke close to the ground. Lakewood sits inside that same air basin, so a still, cold week can turn hazy even without a single wildfire burning.
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 Lakewood, 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
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Air quality near Lakewood
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