An air quality map by zip code turns the invisible into a single number you can act on. That reading can swing from a calm green 30 to a hazy red 180 between breakfast and dinner, especially when wildfire smoke drifts in from a fire you'll never see. We're obsessed with the air you breathe, and a quick ZIP search is the fastest way to know what's actually around your home right now.
Reading it well takes about a minute once you know what the numbers and colors are saying. That minute can change how you plan a smoky afternoon.
An air quality map by ZIP code shows your local AQI as a live number and color from nearby monitors.
Read it fast. Type your ZIP, read the number and color, then tap your station for the main pollutant.
Colors run from green for good up to maroon for hazardous. Orange and up means sensitive groups should limit outdoor time.
When your AQI passes 150, close the home, recirculate the HVAC, and check your filter.
An AQI map by ZIP code turns live local readings into a simple number and color.
Green and yellow are routine. Orange and up means sensitive groups should take care.
When the AQI passes 150, close the home, set the HVAC to recirculate, and check the filter.
Match the filter to the air. MERV 8 for everyday dust, MERV 11 for allergens, MERV 13 for smoke when airflow allows.
The Air Quality Index, or AQI, runs from 0 to 500. Low numbers mean clean air. High numbers mean more risk to your health. A map pulls live readings from monitoring stations and sensors, then paints each spot with a number and a color for whatever pollutant is worst at that moment, usually fine particles called PM2.5 or ground-level ozone. If you want the full background on how the Air Quality Index is calculated, that reference is a solid place to start.
Reading an AQI map by zip is quick once you know where to look. Here's the order we walk customers through.
Type your ZIP code or city into the map's search box so it centers on your area.
Read the number and color at your spot. That's your current AQI and its category.
Tap the nearest station to see the main pollutant and how it has moved over the last few hours.
Compare a couple of nearby ZIP codes. Readings can jump from one neighborhood to the next during smoke or rush-hour traffic.
Check back later if the wind kicks up or the sky turns hazy.
When you want a live look across the country, you can check the live AQI map for the USA and search any ZIP in seconds.
The U.S. AQI uses six colors, and each one tells you who should pay attention.
Green, 0 to 50, Good. The air is healthy for everyone.
Yellow, 51 to 100, Moderate. A few unusually sensitive people may want to ease up on long outdoor efforts.
Orange, 101 to 150, Unhealthy for Sensitive Groups. Children, older adults, pregnant people, and anyone with asthma or heart or lung conditions should take it easier outside.
Red, 151 to 200, Unhealthy. Everyone may start to feel it, and sensitive groups feel it sooner.
Purple, 201 to 300, Very Unhealthy. Treat it as a health alert and limit your time outdoors.
Maroon, 301 and above, Hazardous. Stay inside with the air sealed and filtered.
One glance at the color tells you whether today is a normal-plans day or a take-it-easy day.
Most U.S. air quality data starts at the Environmental Protection Agency and flows through AirNow, the government's official reporting system. When you open an EPA air quality map, you're usually looking at AirNow data. Consumer maps and low-cost sensor networks provide readings between official monitors, filling gaps where no station is nearby.
There's a trade-off worth knowing. Official monitors are highly accurate, but they sit miles apart. Sensor maps cover more ground with a little less precision. Read both together, and you get a fuller picture than either one gives you alone, which matters most when smoke is moving fast.
A reading earns its keep when it changes what you do. Once your local AQI passes 100, ease off hard outdoor activity and start closing windows and doors. When it passes 150, switch your HVAC to recirculate and pull your filter for a look. Smoke and fine particles load a filter far faster than everyday house dust, so the one that looked fine last week can clog in a couple of smoky days.
Match the filter to the air. MERV 8 handles everyday dust and lint. MERV 11 grabs the smaller stuff from pets and pollen. MERV 13 captures fine particles in wildfire smoke, as long as your system maintains normal airflow with one installed. After a rough air stretch, we watch those filters come back darker and heavier than a normal month should explain, and that's the clearest sign it's time for a fresh one.
“After manufacturing filters for over a decade and serving more than two million households, we've learned how fast indoor air follows the reading outside. Checking the AQI map for your ZIP code is the first move. Matching your filter to that reading is the second, and it's the one most people forget.” — Filterbuy Team
Reading the map is step one. Acting on it is how you protect your family. We're obsessed with clean air, and we want you to leave this page knowing exactly where to turn next. These seven trusted sources take you from a number on a screen to real protection inside your home.
When you want the real number, go to the people who set the standard. AirNow is the EPA's official AQI system, so you can trust the reading and its category before you make a single call for your household.
Source: AirNow's official guide to using the Air Quality Index
Good protection starts before the air turns. The National Weather Service forecasts ozone and smoke, so you can time workouts, errands, and the kids' outdoor plans around cleaner hours instead of guessing.
Source: The National Weather Service air quality safety guidance
You're the one looking out for everyone under your roof, and the CDC helps you do it well. It spells out which family members feel poor air first and what to do as the AQI climbs.
Source: The CDC's guidance on air quality and your health
This is where a reading becomes real protection. The EPA's guide walks you through portable air cleaners and HVAC filters and points you toward MERV 13, or the highest rating your system can handle. It's the choice we help families get right every day.
Source: The EPA's Guide to Air Cleaners in the Home
Protecting your home shouldn't feel complicated. The American Lung Association answers the everyday questions about using the AQI and turns a worrying number into a few simple moves anyone in the family can follow.
Source: The American Lung Association's guide to protecting yourself from poor air quality
When someone you love has asthma or allergies, the right gear matters even more. The Asthma and Allergy Foundation covers room size, clean air delivery rate, and the devices worth skipping, so you can pick air cleaning that truly cuts their triggers.
Source: The Asthma and Allergy Foundation's advice on choosing an air cleaner
Once you see what poor air really does, you won't look at your home the same way. MedlinePlus lays out the health costs of air pollution in plain language and gives you the reason behind every filter change and window check.
Source: MedlinePlus on the health costs of air pollution
Here's the evidence behind our advice. Every figure matches what we see in real homes.
More than 40% of Americans live where the air turns unhealthy at times. A quick ZIP check catches it early.
Source: NASA's report on its TEMPO air-monitoring instrument
More than 4 million deaths in 2019 were traced to long-term PM2.5 exposure, now the top environmental health risk. Clean indoor air is real protection.
Source: The U.S.-based Health Effects Institute's State of Global Air analysis
MERV 13 plus a portable air cleaner cut a home's indoor-to-outdoor PM2.5 ratio to 0.22, down from 0.55, in a wildfire study. We see the same story in the filters customers send back.
Source: A peer-reviewed study of household PM2.5 interventions during a wildfire
Treat a reading as a prompt rather than a verdict. One orange afternoon doesn't mean you need to overhaul your home. It means today's a good day to close the windows, run the system on recirculate, and glance at your filter. The habit that protects your household is small and repeatable. Check the ZIP-level reading when the air looks or smells off, then let what you see guide a couple of easy moves.
You're the one watching out for the people under your roof. A clear map and a good filter just make that job easier.
Bookmark a live AQI map and check it on hazy, windy, or smoky days.
Write down your filter size and the MERV rating you run now.
Keep a spare filter on hand before smoke season starts.
Open an AQI map, type your ZIP code or city into the search box, and read the number and color for your spot. Most maps let you tap a nearby station for the main pollutant and its recent trend.
Green is good, yellow is moderate, orange is unhealthy for sensitive groups, red is unhealthy for everyone, purple is very unhealthy, and maroon is hazardous. The higher the number behind the color, the bigger the health concern.
They overlap. The EPA's AirNow system supplies the official data behind most real-time air quality maps, and many consumer maps layer in sensor readings for denser coverage.
Air turns unhealthy for sensitive groups at an AQI of 101 and unhealthy for everyone at 151. Readings of 201 and up are very unhealthy or hazardous, and they call for staying indoors.
Check your filter once your local AQI passes 150, especially during wildfire smoke. Fine particles load filters fast, so swap yours early if it looks dark or your airflow drops.
Most maps refresh throughout the day. Check again whenever the wind shifts or the sky turns hazy, since conditions can change within hours.
Air quality can change fast, but staying ready doesn't have to be hard. Check the live AQI map for your ZIP whenever the air looks off, and keep the right filter on hand for the days it counts. Filterbuy has been making pleated MERV 8, MERV 11, and MERV 13 filters in the USA since 2013, in standard and custom sizes, so a clean one is ready the moment your reading climbs.
