June 17, 2026
You can check the AQI near you for free in under a minute — open AirNow.gov or your phone's weather app and enter your location. The Air Quality Index runs from 0 to 500, and the higher it climbs, the dirtier the air; anything from 0 to 50 is Good and safe for nearly everyone.
Once your local reading passes 100, children, older adults, and people with heart or respiratory conditions should pay closer attention. Because outdoor air drifts inside, a clean MERV 13 filter captures the fine particles (PM2.5) behind most high readings.
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Are you getting ready to go for a walk? Maybe you want to send the kids outside to play, or you notice a thick haze on your commute. You need to know if the outdoor air is safe to breathe.
The Air Quality Index gives you a fast, reliable way to understand how clean or polluted the air is right now. It is basically a weather report for the air you breathe. You do not need a science degree to understand it. You just need to know where to look and what the colors mean.
Check your area now with Filterbuy’s real-time AQI map.
The Air Quality Index (AQI) provides a simple and quick way to determine how clean or polluted the air is.
Understanding the AQI does not require specialized knowledge—just knowing where to check and how to interpret the colors is enough.
Using tools like Filterbuy’s real-time AQI map can help you make informed decisions about outdoor activities for yourself and your family.
The Air Quality Index is a number and color system created by the Environmental Protection Agency (EPA). It helps people understand outdoor air quality and potential health concerns.
The scale runs from 0 to 500. Higher numbers mean more air pollution and a greater risk to your health. According to AirNow, an official government resource, an AQI of 50 or below is good. An AQI over 300 is hazardous.
The EPA uses the AQI to track five major outdoor air pollutants regulated by the Clean Air Act. These include ground-level ozone, particle pollution (like PM2.5 and PM10), carbon monoxide, sulfur dioxide, and nitrogen dioxide. You do not need to memorize these chemicals. Just know that the AQI measures the worst offender in your area on any given day.
Knowing your local air quality is easy. You just need a smartphone or a computer.
A live AQI map is the most accurate tool available. It lets you search by city or ZIP code. You can easily compare conditions in your neighborhood with surrounding areas.
Use Filterbuy’s live AQI map to check your area now.
You can type "AQI near me" into any major search engine or weather app. These tools will usually show you a quick number. When you see that number, make sure to check the color category and the main pollutant driving the score.
Air quality can shift from hour to hour. Wildfire smoke can move quickly with the wind. Rush-hour traffic can cause sudden pollution spikes. Heat and visible haze can also change the air quality throughout the afternoon. If the weather changes, check the live AQI map again.
The EPA divides the AQI into six simple, color-coded categories. Here is what the numbers mean for your daily routine.
| AQI Range | Air Quality Level | Outdoor Activity Guidance |
|---|---|---|
| 0–50 (Green) | Good | Normal outdoor activity is perfectly fine. |
| 51–100 (Yellow) | Moderate | Most people are okay. Unusually sensitive people may want to reduce long outdoor workouts. |
| 101–150 (Orange) | Unhealthy for Sensitive Groups | Children, older adults, pregnant people, and individuals with asthma or heart disease should reduce outdoor exertion. |
| 151–200 (Red) | Unhealthy | Everyone should consider limiting prolonged outdoor activity. Sensitive groups should stay indoors more. |
| 201–300 (Purple) | Very Unhealthy | Avoid strenuous outdoor activity completely. Focus on keeping your indoor air cleaner. |
| 301+ (Maroon) | Hazardous | Stay indoors as much as possible and follow all local health guidance. |
Local air quality changes just like the weather. Sometimes it changes hour by hour. Wind can blow wildfire smoke into your town very quickly. Ground-level ozone often spikes on hot, sunny afternoons.
Traffic and industrial pollution can build up during the morning commute. Temperature inversions can even trap cold, polluted air near the ground. This is why a green AQI in the morning can easily turn red by the afternoon.
While the AQI tracks five main pollutants, two of them cause the most problems for homeowners.
PM2.5 refers to tiny, inhalable particles that are 2.5 micrometers in diameter or smaller. These particles come from wildfire smoke, soot, and exhaust fumes. According to the EPA, PM2.5 particles are small enough to get deep into your lungs. Some can even enter your bloodstream.
Many people assume bad air quality always looks like visible smoke or haze. But ground-level ozone can be very high even when the sky looks clear blue. Ozone forms when heat and sunlight react with vehicle and industrial emissions.
Knowing your AQI is only the first step. You need to know how to respond to protect your home and your health.
Most people can continue their normal routines. You can leave your windows open and enjoy the breeze. If you are highly sensitive to air pollution, just pay attention to any mild symptoms like a scratchy throat.
Reduce your long outdoor workouts. Close your windows to keep the outdoor air from getting inside. Run your HVAC system fan to keep your home air filter circulating and cleaning the indoor air.
Move all of your activities indoors. Keep your doors and windows completely closed. Set your HVAC system to recirculate mode if you have that option. This is also the perfect time to check your home air filter and replace it if it looks dirty.
Wildfire smoke requires extra protection. The EPA recommends upgrading to an HVAC filter rated MERV 13 or higher during smoky periods. A MERV 13 filter captures fine particle pollution from the smoke. Make sure your HVAC system can handle a high-efficiency filter. You will also need to replace dirty filters more often during smoke events.
When outdoor air is poor, your filter becomes part of your home’s first line of defense. Outdoor air easily makes its way indoors through open windows, door gaps, roof leaks, and HVAC ventilation.
A properly fitted air filter captures airborne particles as air circulates through your system. Filterbuy offers MERV 8, MERV 11, and MERV 13 air filters to help you manage different levels of pollution. Choose a MERV 8 filter for basic dust control. Choose a MERV 13 filter if you need to block fine smoke particles.
Exact fit matters. If a filter is too small, air will simply bypass the filter media and blow dirt right back into your house. Filterbuy provides standard and custom sizes to guarantee a perfect fit. We recommend replacing most pleated furnace filters every 90 days. You should change them even more frequently during heavy smoke or allergy seasons.
Use this simple checklist before you head out the door:
Search your ZIP code or city on a live AQI map.
Note the number, the color, and the main pollutant.
Check whether you or someone in your home belongs to a sensitive group.
Adjust your outdoor plans if the AQI is orange, red, purple, or maroon.
Keep windows closed and upgrade your HVAC filtration when outdoor air is poor.
Recheck the map later if smoke, wind, heat, or haze changes.
The fastest way to know what is happening near you is to check the live number. Before you open the windows, go for a run, or send the kids outside, check your local AQI first.
Use Filterbuy’s real-time AQI map to see today’s air quality in your area. Check your AQI, then choose the right steps to protect your home and your air.
An AQI of 100 or below is generally safe for outdoor activities. If the AQI is between 101 and 150, sensitive groups should limit their time outside.
An AQI over 100 (the Orange category) is unhealthy for sensitive groups, including people with asthma. Asthmatics should move activities indoors and run a high-quality home air filter when the AQI reaches this level.
Yes. Wildfire smoke fills your home air filter with fine PM2.5 particles much faster than regular dust. You should check your filter weekly during smoke events and replace it as soon as it looks dark or clogged.
Yes. A MERV 13 air filter is highly effective at capturing the fine PM2.5 particles found in wildfire smoke. Always check your HVAC manual first to ensure your system has enough airflow to use a MERV 13 filter safely.
