Detroit Real-Time AQI Tracker
Get Alerts For Unhealthy AQI In Your Area
When air quality in your area reaches unhealthy levels, we'll send you a quick alert, along with expert tips on how to reduce your exposure.
What's Actually In Detroit Air Today?
What High AQI Means for Your Lungs in Detroit
How to Read AQI
The Air Quality Index (AQI) measures how polluted the air is and how it may affect your health.
0–50 (Good): Air quality is satisfactory.
51–100 (Moderate): Acceptable, but some pollutants may pose minor concerns.
101–150 (Unhealthy for Sensitive Groups)
151–200 (Unhealthy)
201–300 (Very Unhealthy)
301+ (Hazardous)
Moderate
Still okay for most, but if you have asthma or allergies, take it easy and avoid long outdoor workouts.
Shop MERV 11 filters→What's the Right Filter for Your AQI Level?
Detroit Air Quality Index (AQI) Today
TL;DR
Check the live air quality map above for current conditions in Detroit. Over a full year the American Lung Association’s 2026 State of the Air report ranks metro Detroit 9th worst in the country for year-round particle pollution and 11th for short-term spikes, though most days are unremarkable. The bad days arrive quickly, usually on Canadian smoke, so read the map before outdoor plans and then check your filter.
Key Takeaways
Detroit’s worst AQI on record is 650, in Southwest Detroit on July 16, 2026, the highest since recordkeeping began in 1999.
Michigan called 31 air quality alert days in 2025, 23 for fine particulates.
The EPA recommends MERV 13 during wildfire smoke, with the fan on On rather than Auto.
Detroit Air Quality Map And Forecast: How To Read The Live AQI
The live map above carries Detroit’s current AQI, the pollutant driving it and the day-ahead forecast for Wayne County. Check your own side of the city rather than a citywide average, because readings across metro Detroit can differ by a whole category in an afternoon. Filterbuy pulls them hourly from the EPA’s AirNow network, not an aggregator, and EGLE’s MiAir dashboard and the City of Detroit dashboard go finer still.
Is The Air Quality Bad In Detroit?
Measured across a full year, yes. Wayne County earned an F for ozone in the American Lung Association’s 2026 State of the Air report, with 20 high-ozone days and 25 high-PM2.5 days over 2022 to 2024, putting the metro area in the national bottom fifteen on both particle measures. Most days are fine, and that is what makes the bad ones easy to be caught out by.
Detroit’s two national rankings moved in opposite directions this year: year-round levels improved from 6th worst to 9th, while short-term spikes worsened from 22nd to 11th. That split is the part most coverage skips, and it changes what a household should do. A slowly improving average rewards a decent baseline filter; worsening spike days reward readiness, a filter already in the system before the alert rather than one ordered during it.
Why Is Detroit’s Air Quality So Bad?
Beyond the Canadian wildfire smoke covered next, Detroit’s air is shaped by what sits on the ground: heavy industry along two rivers, freight through a busy border crossing, and weather that cooks pollution into ozone in summer or traps it under an inversion in winter. A bad-air day is rarely one cause.
The industrial corridor. Southwest Detroit, River Rouge, Ecorse and Dearborn host the Marathon refinery, Cleveland-Cliffs’ Dearborn Works, DTE assets and the Great Lakes Water Authority plant.
Traffic and freight. I-75, I-94 and I-96 cut through dense neighborhoods toward the Ambassador and Gordie Howe bridges, and diesel exhaust is block-scale, so readings differ street to street.
Summer ozone. Ozone is not emitted directly but forms when sunlight cooks nitrogen oxides and volatile organic compounds, peaking on hot, still afternoons in July and August.
Winter inversions. When warm air settles over cold air near the ground, pollution has nowhere to go. EGLE called a southeast Michigan alert on that in early 2026.
How Canadian Wildfire Smoke Reaches Detroit
Wildfire smoke from Ontario and western Canada reaches Detroit when a front drags a plume south, and it is the biggest reason the city’s AQI now swings from green to red inside a day. Over 1.5 million acres burned in Ontario during 2026, and on July 16 that year Detroit hit 650, deep inside the hazardous range, with local reporting documenting a jump in hospital visits. The AirNow Fire and Smoke Map shows plumes early, and you can track smoke heading here.
What Are Detroit’s PM2.5 Levels Right Now?
For current PM2.5 levels in Detroit, refer to the live map above. PM2.5 sets the city’s AQI on most days, and these particles run under 2.5 micrometers, small enough to travel deep into the lungs. The table below gives the limits worth measuring a reading against, from the EPA NAAQS table, which works differently from the AQI.
| Benchmark | Level (µg/m³) | Set By |
|---|---|---|
| Annual national standard | 9.0 | U.S. EPA |
| 24-hour national standard | 35 | U.S. EPA |
| Annual guideline | 5 | World Health Organization |
| 24-hour guideline | 15 | World Health Organization |
How Does Air Quality Differ Across Metro Detroit And 48217?
One number for Detroit hides a lot, because EGLE runs roughly a dozen monitors across Southeast Michigan and the spread between them can cross a whole AQI category in a day. Southwest Detroit’s 48217 is the sharpest example, called Michigan’s most polluted ZIP code since University of Michigan research by Paul Mohai and Byoung-Suk Kweon, with forty industrial facilities within a few miles.
The monitor covering the ZIP code sits on its southwest edge, upwind of the heaviest sources, so readings may understate what residents nearer the refinery breathe. What matters here is not the MERV rating but the calendar: a filter working every day rather than three bad weeks wears out sooner. Rating is a filtration question, interval is a loading one, and Filterbuy ships here year-round, so we lead with interval.
What The AQI Does Not Tell You In Detroit
Detroit’s AQI, like any American city’s, covers five regulated pollutants: ozone, particulate matter, carbon monoxide, sulfur dioxide and nitrogen dioxide. It does not cover air toxics such as benzene, which is why EGLE runs separate toxics monitoring at Dearborn, River Rouge, Detroit–Southwest and 48217. A green reading means a good particle day, not a clean-air day.
The second limit is one we would rather you knew before buying from Filterbuy. A MERV filter captures particles, not gases, so on a high-ozone afternoon it does little about the pollutant driving the number, while cutting outdoor exertion does more. Filtration earns its keep on particulate days, which here is most of them.
What Is A Detroit Air Quality Alert?
A Detroit air quality alert is a public notice that pollution is expected to reach levels unhealthy for at least some people. Three agencies are involved: Michigan EGLE runs the statewide forecast, the Southeast Michigan Council of Governments issues regional advisories, and the National Weather Service relays them.
EGLE now issues Air Quality Alerts only, having retired the advisory tier used through 2024 and 2025. One is called when PM2.5 or ozone is forecast to reach Unhealthy for Sensitive Groups or worse; PM2.5 alerts run year-round, ozone alerts March 1 to October 31.
Rather than check manually, register for EnviroFlash alerts by ZIP code, read the state health department’s Your Health and Wildfire Smoke guidance, and see our mask guide on why cloth does not help.
What To Do Indoors When Detroit’s AQI Climbs
Closing the windows is step one, not the whole job, because smoke gets in through cracks and vent gaps. The EPA finds that upgrading the HVAC filter and running the fan continuously cuts indoor PM2.5 by about half. Set the fan to On, close the fireplace damper, and keep one bedroom as a clean room with a HEPA purifier. Here is how to find your filter; if it needs replacing, find your size, shop Filterbuy MERV 13 filters or set up auto-delivery.
| AQI | Category | What to Do in Detroit | Filter |
|---|---|---|---|
| 0–50 | Good | Outdoor plans are fine. | MERV 8 |
| 51–100 | Moderate | Fine for most; sensitive groups go easier. | MERV 8–11 |
| 101–150 | Unhealthy for Sensitive Groups | Sensitive groups indoors. | MERV 11–13 |
| 151–200 | Unhealthy | Everyone cuts exertion. | MERV 13 |
| 201–300 | Very Unhealthy | Stay indoors, seal up, filter nonstop. | MERV 13 + HEPA |
| 301+ | Hazardous | Stay indoors; N95 if you must go out. | MERV 13 + HEPA |
"The question I get on Detroit service calls during smoke season is whether the house can take MERV 13. Most systems built in the last twenty years can. What causes trouble is one left in past its life, because static pressure climbs and the blower starts fighting the filter. The rating is rarely the problem. The interval is."
— David Clark, Licensed HVAC Technician, Filterbuy HVAC Solutions
Filterbuy has manufactured air filters in the United States since 2013, from plants in Alabama, Florida, Pennsylvania and Utah, shipping factory-direct to more than two million households. Every smoke season the pattern repeats: the families breathing clean indoor air checked their filter in May, not during the alert. If you are weighing ratings, start with which MERV filter stops wildfire smoke.
Why We Watch Detroit Closely
I track air quality alerts for every market Filterbuy ships to, and Detroit is the one I check first in July. Not because the yearly average here is worst in the country, because it is not, but because the gap between an ordinary Tuesday and the worst day on record is wider than almost anywhere we serve. A city can look fine on paper and still hand you a 650.
Michelle Wan, Brand Manager and Air Quality Writer, Filterbuy
Supporting Statistics
Three findings explain why Filterbuy treats Detroit as a year-round filtration market rather than a fire-season one: bad-air days here are frequent, they send people to hospital, and the city starts from a higher baseline of respiratory illness than the rest of Michigan.
1. Michigan called 31 air quality alert days in 2025
The 2025 split:
23 days for fine particulate matter (PM2.5)
6 days for ground-level ozone
2 days for both pollutants at once
2023 produced the same total but split it evenly, so the move toward PM2.5 is the wildfire signal. One caveat: EGLE retired its advisory tier in March 2026, so counts either side are not comparable.
Source: Michigan EGLE, March 2026.
2. Asthma emergency visits ran 17 percent above expectation during the 2023 smoke episodes
Across 19 wildfire smoke days nationally, the CDC found in the region covering Michigan and five neighboring states:
172 excess asthma visits in one day, all ages
155 excess visits among adults 18 to 64, over two days
216 µg/m³ peak 24-hour PM2.5, six times the daily standard
Source: CDC, Morbidity and Mortality Weekly Report, August 2023.
3. Detroit’s asthma rate runs well above the state’s
According to the Michigan Department of Health and Human Services (MDHHS), asthma prevalence from 2017 to 2019 was significantly higher in Detroit than statewide:
Adults: 16.2% in Detroit compared with 11.1% statewide, a 46% higher rate.
Children: 14.6% in Detroit compared with 8.4% statewide, a 74% higher rate.
Detroit Air Quality FAQ
Why did Detroit’s AQI jump today?
Usually a wind shift has pulled wildfire smoke into Southeast Michigan, or afternoon sun has formed ozone. Both move the index within hours, so refer to the live map rather than judging by eye.
Who should be most careful when Detroit’s air quality is poor?
Children, older adults, pregnant people, outdoor workers and anyone with asthma, COPD or heart disease. They should limit hard outdoor activity from the orange band upward; everyone else from red.
Is it safe to exercise outside on an orange day in Detroit?
For most healthy adults, light activity such as walking is fine, while sensitive groups should move harder workouts indoors. Either way, shorten the session and go in if you notice coughing or chest tightness.
Do I need a HEPA filter in my furnace?
No. Most residential systems are not built for true HEPA and forcing one in restricts airflow. Use the highest MERV your system safely supports, usually between 8 and 13, and add a HEPA room purifier where you sleep.
Why does Detroit sometimes rank worst in the world for air quality?
Those headlines come from real-time global rankings taken during short smoke events, so they describe one morning rather than the year-round average. Detroit has genuinely held the top spot, as in July 2026, but conditions improve once the wind shifts.
Glossary
AQI (Air Quality Index). The EPA’s 0–500 scale turning pollutant levels into one color-coded health rating.
PM2.5. Fine inhalable particles 2.5 micrometers or smaller, the pollutant driving Detroit’s AQI most days.
Ground-level ozone. A gas formed when sunlight reacts with nitrogen oxides and VOCs. Filters do not remove it.
MERV. Minimum Efficiency Reporting Value, the 1–16 scale rating a filter’s particle capture. MERV 13 is the EPA’s wildfire benchmark.
