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.
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)
Still okay for most, but if you have asthma or allergies, take it easy and avoid long outdoor workouts.
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By Michelle Wan, Brand Manager & Air Quality Writer | Filterbuy · Reviewed by David Clark, Licensed HVAC Technician · Published July 6, 2026 · Updated July 6, 2026
Check the live map on this page for your exact ZIP code before you plan outdoor time.
Going outside is fine for most people when the AQI is under 100, and sensitive groups should ease off above 100.
The pollutant most likely driving today’s number is fine particle pollution (PM2.5) from winter inversions or wildfire smoke, with ground-level ozone a lesser factor on hot summer afternoons.
Your strongest indoor protection is a MERV 13 filter with the windows closed when the AQI climbs.
Minneapolis’s AQI updates hourly and follows the U.S. EPA Air Quality Index scale, which spans 0–500: 0–50 is Good (green), 51–100 is Moderate (yellow), 101–150 is Unhealthy for Sensitive Groups (orange), 151–200 is Unhealthy (red), 201–300 is Very Unhealthy (purple), and 301 and above is Hazardous (maroon). On most days across the Twin Cities the reading sits in the Good to Moderate range. It spikes higher during winter particle episodes and when wildfire smoke reaches the Upper Midwest. In our experience helping Minnesota households, the figure people underestimate most is not the daily high, it is how fast the number climbs once smoke arrives. If you are in a sensitive group, treat orange as your signal to move activity indoors.
AQI categories follow the U.S. EPA Air Quality Index scale. Check the live map for current conditions in your area.
Minneapolis’s AQI is driven mostly by fine particle pollution (PM2.5): winter particles trapped by cold-air inversions and summer wildfire smoke.
Readings change hour to hour, so check the live map before outdoor plans rather than trusting yesterday’s forecast.
Wildfire smoke now reaches Minnesota. Canadian smoke has pushed the Twin Cities into unhealthy conditions in recent summers, with 2023 setting a record for alert days.
Sensitive groups (kids, older adults, and anyone with asthma or heart disease) should act at a lower AQI than everyone else.
When outdoor air turns orange or worse, your indoor air becomes your safest space, and a MERV 13 filter helps keep it that way.
Sensitive groups should act at a lower AQI than the general public. Guidance based on U.S. EPA and CDC recommendations.
Minneapolis’s air tells two different stories depending on the season. In winter, cold and stagnant air settles into a temperature inversion that traps wood smoke, vehicle exhaust, and home-heating particles close to the ground. That is why fine particle pollution runs roughly twice as high in the coldest months as it does in summer, and why a calm, frigid January day can quietly push the number up. Fine particles, called PM2.5, are small enough to slip past your body’s defenses and reach deep into your lungs.
The second story is wildfire smoke, and it is the shift worth understanding. Minneapolis used to sit downwind of very little smoke. Now the Upper Midwest catches plumes from Canadian and western fires, and those events can turn a Good-air morning into an Unhealthy afternoon within hours. Ground-level ozone plays a smaller role here than in hotter states, since the metro only nudges the temperatures that cook up ozone during July and August. We noticed the smoke change in our own inbox before the forecasts caught up, as questions from Minnesota customers about smoke-rated filters climbed within days of the haze arriving.
Patterns vary by year and location. Always check the live AQI for current conditions.
Minneapolis’s air also depends on where you stand. The mix that fuels a bad-air day along a downtown freeway looks nothing like the air over a quiet lake neighborhood, and knowing your part of the metro tells you which pollutant to watch first. This is the part generic AQI maps leave out, so we mapped it to the city. For readings down to your own block, the City of Minneapolis publishes neighborhood sensor data.
Area patterns are general and shift with weather and wildfire seasons. Always check the live map for your exact location.
A lot of Minnesotans assume their home is automatically a refuge. It is not. When outdoor PM2.5 spikes, those particles work their way indoors through gaps, doors, and fresh-air intakes. The good news is that you have real control over the air you breathe most of the day. Running your HVAC system with a high-efficiency filter, keeping windows closed during smoke events, and watching the live AQI are three moves that genuinely change your exposure. Most guides skip this part. In the Minneapolis homes Filterbuy ships to, the ones that ride out a smoke event comfortably are not the ones that react fastest. They are the ones that already had a MERV 13 filter built for smoke and fine particles installed before the alert, since that rating captures a large share of the particle sizes that make Minneapolis’s worst air days dangerous.
I have spent the last few years turning Minnesota’s air data into plain advice, and the change that reset my own habits was how ordinary a bad-air day has become here. I check the AQI the way I check the weather now, and I keep a spare MERV 13 in the closet from May through October. If I had one sentence to leave with a Minneapolis family, it is this: Decide your plan on a clear day, so a smoke afternoon never catches you deciding.
Michelle Wan, Brand Manager & Air Quality Writer, Filterbuy
After manufacturing filters for over a decade and serving more than two million households, we have learned that people underestimate how much of their day is spent breathing indoor air. When Minneapolis’s AQI turns orange or red, the filter in your system stops being a maintenance item and becomes a health tool. Match the filter to the threat, keep it fresh, and you have done more for your family’s lungs than almost anything else you can do at home.
David Heacock, Founder and CEO, Filterbuy
You cannot see ozone or fine particles drifting over your street, but you can stay a step ahead of them. These are the seven resources the Filterbuy team leans on every day, and the ones we would hand any Minneapolis family that wants to protect the people under their roof.
Minnesota’s own monitors reveal the fine particles and smoke you cannot see, and a quick email signup means each poor-air day lands in your inbox before it lands in your lungs. Source: Minnesota Pollution Control Agency Current Air Quality Conditions
AirNow is the EPA’s own air-quality service and the data source behind most live maps, so you can trust the number, the color, and the pollutant before you make a single call for your household. Source: AirNow AQI Basics
Federal guidance walks you through sealing smoke out and points to a MERV 13 filter as the workhorse for trapping the fine particles that sneak indoors, with a low-cost DIY option when a purifier is out of reach. Source: EPA On Creating A Clean Room During A Wildfire
The CDC spells out who is most vulnerable to smoke, from young kids and older adults to anyone with asthma, heart disease, or a pregnancy, plus the early symptoms worth watching for. Source: CDC On How Wildfire Smoke Affects Your Body
The National Weather Service explains how it forecasts ozone and smoke and what an official air quality alert is really asking you to do that day. Source: National Weather Service Air Quality Safety
Straight from the city, this dashboard maps sensor readings by Minneapolis neighborhood, so you can see the air on your block instead of a citywide average. Source: City of Minneapolis Air Monitoring Dashboard
Peer-reviewed research from Aguilera and colleagues found that wildfire-specific PM2.5 sends more people to the hospital for breathing trouble than everyday particle pollution, the science behind why we tell every family to have a MERV 13 ready before smoke is in the forecast. Source: Peer-Reviewed Research On Wildfire Smoke And Respiratory Health
Don’t take our word for it. The invisible stuff in Minneapolis’s air shows up in the data. Here’s why we tell every family to watch the AQI and keep a fresh filter in the system.
The Twin Cities Earned An F For Particle Pollution
The Minneapolis-St. Paul metro ranked 39th worst in the nation for short-term particle pollution in the 2026 report.
Hennepin County averaged 4.5 unhealthy air days a year, the worst daily particle grade of the metro’s counties.
Source: American Lung Association 2026 State of the Air, Minnesota
Wildfire Smoke Now Reaches Minnesota
Minnesota set a record with 52 air quality alert days in 2023.
Sixteen of those alerts were driven by fine particles from wildfire smoke.
Source: Minnesota Pollution Control Agency On Record Air Quality Alerts
Air Pollution Is A Local Health Burden
Fine particles and ozone play a role in about 10% of all deaths in the Twin Cities metro.
That is on top of nearly 500 hospitalizations and emergency room visits for heart and lung problems.
Source: Minnesota Department of Health and MPCA Life and Breath Report
That is why Filterbuy treats a MERV 13 filter as a health tool rather than a maintenance item.
Air quality in Minneapolis has quietly changed. For years, most residents could ignore the AQI and be fine. That is no longer a safe habit. After years of shipping filters into this state, the shift we cannot unsee is how routinely a clear morning turns into a stay-inside afternoon once smoke or winter inversions move in. Our honest take at Filterbuy is that the AQI now deserves a spot on your daily glance, right next to the temperature. It costs you nothing, it takes five seconds, and you can look up your AQI by ZIP code to see exactly when to protect the people under your roof.
Bookmark the live map above and check it before any outdoor exercise, yard work, or kids’ sports.
Sign up for Minnesota Pollution Control Agency air quality alerts so bad days reach you before you head outside.
On orange or worse days, close windows, run your HVAC on the fan or recirculate setting, and stay indoors when you can.
Confirm the filter in your system is fresh and rated for fine particles. If you are unsure of your size, find your exact filter size and set a replacement reminder.
MERV stands for Minimum Efficiency Reporting Value. Higher ratings capture smaller particles.
A: Use the live map at the top of this page, then enter your ZIP code or neighborhood for a reading specific to your area. The map pulls hourly data, so refresh it before you make outdoor plans rather than relying on an earlier forecast.
A: An AQI above 100 (orange) is Unhealthy for Sensitive Groups, and above 150 (red) is Unhealthy for everyone. If you have asthma, heart disease, or you are caring for young children or older adults, start limiting outdoor time once the reading hits orange.
A: On cold, calm days a temperature inversion traps pollution near the ground while home heating and wood smoke run hardest. Fine particle levels can run about twice as high in winter as in summer, which is why a clear, frigid day can still post a higher number than you would expect.
A: Yes, and we have watched it happen. Smoke from Canadian and western wildfires now travels into the Upper Midwest, and 2023 set a record for Minnesota air quality alert days. Wildfire smoke is a growing driver of Minneapolis’s worst air days.
A: Set the fan to the on setting so your system filters air continuously instead of only when it is heating or cooling. Switch to recirculate or close the fresh-air intake so you are not pulling smoke inside, and keep the highest MERV filter your system handles. On auto with a low-grade filter, a smoke day mostly passes your air by.
A: Most modern systems handle MERV 13 without trouble. A very old or undersized system can lose some airflow, though. If your airflow feels weak or your manual caps the rating, step down to MERV 11 or check with a technician before upgrading. Clean air should not come at the cost of your system.
A: Moderate air (51 to 100) is fine for most people. If you have asthma or you are planning a hard workout, ease up near the yellow-to-orange line, and on smoky summer days check the map again right before you head out, since the number can climb fast.
A: Fine particles can hang in your home for hours after the outdoor number drops. Keep your fan and filter running a while longer, hold off on candles or heavy cooking that add indoor particles, and swap the filter once conditions clear if it looks loaded.
A: For fine particles and smoke, a MERV 13 filter is the practical choice for most homes, and it is the rating the EPA points to for reducing indoor smoke particles. In our experience, the filter most homes already have installed is a step or two behind what a smoke day calls for. If you are weighing options, here is how to choose the right MERV rating for your system. Keep it fresh, since a loaded filter cannot do its job.
Clean indoor air is the part of Minneapolis’s air quality you actually control, and it is the one we have watched families win on again and again. When the map turns orange, the right filter turns your home into the safest room in the Twin Cities. Shop Filterbuy MERV 13 filters, match the MERV rating to the threat, and keep your family breathing easier on the good days and the bad ones.
