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Use a local PM2.5 reading, not sight or smell alone. In the United States, open the AirNow Fire and Smoke Map, search your location, and inspect the nearest PM2.5 monitor or sensor. Its AQI, timestamp, recent history, and trend tell you whether smoke is affecting the air where you are. A satellite plume can show smoke aloft without proving that ground-level air is polluted, while the general AirNow dial may be reporting ozone instead of smoke.
Start with the local PM2.5 reading
Wildfire smoke contains fine particles called PM2.5 (particulate matter 2.5 micrometers or smaller). These particles are the main measurement to check during a smoke event. The most useful answer is the reading closest to your actual location, with its measurement time and recent direction of change.
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Open the AirNow Fire and Smoke Map on a phone or computer. The map combines permanent regulatory monitors, temporary monitors installed for an event, and air sensors. That combination gives more local coverage than relying on one regional number.
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- 【Professional 10-in-1 Air Quality Monitor】This professional 10-in-1 air quality monitor accurately measures carbon dioxide (CO2), formaldehyde (HCHO), total volatile organic compounds (TVOC), temperature, humidity, AQI, PM2.5, PM1.0, PM10 in real time, and features a clock (Connect your phone to the monitor via Bluetooth: MT13S, and it will automatically calibrate the time). It helps you keep track of your indoor air quality at a glance, making it ideal for home use.
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How to check your location step by step
1. Open the Fire and Smoke Map
- Go to the AirNow Fire and Smoke Map.
- Enter your city, town, or ZIP code in the location search, or allow the site to use your device’s geolocation.
- Zoom in until you can distinguish the measurement icons around your home, workplace, school, or travel destination.
Use the map for the place where people will actually spend time. A regional reading several miles away may not reflect a valley, hillside, coastal area, or neighborhood separated by changing winds.
2. Select the nearest PM2.5 icon
Tap or click a nearby monitor or sensor. The information panel identifies the current AQI and provides the measurement’s same-day history, recommended actions, and a trend such as stable, improving, or worsening. Record the time shown with the value; a number without a timestamp is difficult to interpret during a rapidly changing fire.
The icon’s size or shape indicates whether the source is a permanent monitor, a temporary event monitor, or an air sensor. All three can help you understand local conditions, but they are different measurement types. If several are nearby, compare their distance and timestamps rather than automatically choosing the highest or lowest value.
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The map displays particle pollution through the U.S. Air Quality Index (AQI). Use the category attached to the selected location, not just the color of a broad map area.
| AQI | Category | What the category tells you |
|---|---|---|
| 0–50 | Good | The displayed air-quality level is in the Good range for the measured pollutant. |
| 51–100 | Moderate | The displayed level is in the Moderate range. |
| 101–150 | Unhealthy for Sensitive Groups | The map identifies conditions that can be a concern for people in groups at increased risk. |
| 151–200 | Unhealthy | The displayed particle-pollution level is in the Unhealthy range. |
| 201–300 | Very Unhealthy | The displayed level is in the Very Unhealthy range. |
| 301 and higher | Hazardous | The displayed level is in the Hazardous range. |
AirNow places health recommendations for the displayed AQI category in the location panel. Follow those current recommendations instead of trying to translate a color into a personal medical decision yourself.
4. Review the history and trend
Open the same-day history before deciding that one number represents the whole event. A reading marked worsening means the latest value is moving in the wrong direction even if the color has not changed yet. A stable or improving trend gives different context from a single spike. Recheck after a change in wind, fire behavior, or local weather because smoke concentrations can change quickly.
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- High Accuracy & Fast Refresh Data: With this smart sensor, the PM2.5 accuracy is ±15 µg/m³ while temperature and humidity accuracies are ±0.54°F and ±3%RH.The two-second correction data feature shows the latest changes in PM2.5, temperature, and humidity.Keep sensor clear for accurate detection.
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- Switchable Display: Press the top button for the clock & PM2.5 display. Long press for 2 seconds to switch to bright screen mode & night mode. The LED indicator displays 4 levels of ambient air quality. 2.4G Wi-Fi is required to display the time.
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5. Look for a Smoke Outlook
Some larger fires have a Smoke Outlook. These outlooks are issued when air-resource advisers are assigned and describe possible smoke impacts over the next several days. An outlook is a planning aid, not a replacement for the current monitor reading: use the current PM2.5 value for conditions now and the outlook for what may happen later.
6. Recheck when conditions change
Refresh the map or revisit it before spending extended time outdoors, commuting through a smoky area, or making plans for children and other people at increased risk. AirNow specifically notes that wildfire smoke concentrations can change quickly, so a morning value may not describe the afternoon or evening.
How to interpret the map’s different layers
PM2.5 measurements are ground-level evidence
A monitor or sensor reports particles measured at or near the surface. The result is the best available indication of what the air is like at that point, although distance, elevation, siting, and timing still matter. Compare a reading at your location with another only after checking those details.
The smoke-plume layer is context, not a local reading
The map’s smoke plume comes from satellite detection. Satellites cannot see the plume at night or through clouds, and smoke is generally easiest to detect in the afternoon. A detected plume can also be smoke aloft that has not mixed down to the ground. Therefore, plume presence does not by itself prove that your breathing-level air is polluted, and plume absence does not prove that it is clear. Select the PM2.5 measurement for your location.
Why the main AirNow dial can disagree
The general AirNow AQI dial and the Fire and Smoke Map are not interchangeable. The dial may be showing another pollutant, such as ozone, or it may have no nearby PM2.5 monitor. During a wildfire, use the Fire and Smoke Map because it includes temporary monitors and sensor data that the general dial may not represent.
What to do when nearby readings disagree
Different numbers do not automatically mean that one source is broken. Use the following checks in order:
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- Compact, Portable & Easy to Use: Small enough to carry anywhere, with a clear display showing temperature, humidity, AQI, and PM2.5 at a glance. Ideal for home, office, school, or travel.
| Comparison | Question to ask | How it affects the interpretation |
|---|---|---|
| Pollutant | Is the value for PM2.5 or for ozone or another pollutant? | Wildfire-smoke decisions should start with PM2.5. A dial driven by ozone may not describe smoke. |
| Measurement type | Is the source a permanent monitor, temporary monitor, or sensor? | The devices have different roles and methods. Treat a sensor as useful additional context, not automatically equivalent to a regulatory monitor. |
| Distance and location | How close is each source, and is it on the same side of a hill, valley, roadway, or fire? | Smoke can vary over short distances. The source closest to where you are may be more relevant than a distant regional station. |
| Timestamp | Were the values recorded at the same time? | Values taken hours apart may reflect a real change rather than a disagreement. |
| Recent trend | Does the history show stable, improving, or worsening conditions? | The trend helps distinguish a temporary spike from a continuing rise or fall. |
| Satellite layer | Are you comparing a plume with a measurement? | A plume is remotely detected smoke and may be aloft; it is not a ground-level PM2.5 value. |
If the official permanent monitor and a nearby sensor differ, keep both the device type and placement in view. A sensor beside a road, near a building exhaust, or in a sheltered location can experience conditions unlike a monitor placed elsewhere. The map’s panel and timestamp provide the information needed to make that comparison; do not average the numbers yourself or assume the higher one is always correct.
Health context during a smoke event
Wildfire smoke can make outdoor air unhealthy to breathe. EPA identifies people with heart or lung disease, older adults, children and teenagers, and people who are more heavily exposed as groups at increased risk of health effects. Burning eyes and a runny nose are possible symptoms, but symptoms are not a reliable substitute for checking the local PM2.5 reading: someone can be affected before symptoms are obvious, and symptoms can have other causes.
When you select a location on the Fire and Smoke Map, use the health and air-quality actions shown for that AQI category. Those recommendations are designed for the displayed conditions and are updated with the map’s current data. If the reading changes category, reopen the panel rather than carrying forward advice from an earlier value.
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If there is no monitor close to you
Large gaps between stations are possible, especially in rural or mountainous areas. First zoom out slightly and inspect temporary monitors and sensors, not only permanent regulatory stations. AirNow includes these sources to improve spatial coverage during events.
A consumer PM2.5 air-quality sensor is optional. It can provide a reading closer to your home when the nearest official monitor is far away, but it is not required to use the Fire and Smoke Map. Treat its result as supplementary context and note the device’s location, timestamp, and measurement type. Do not describe a low-cost sensor as equivalent to a regulatory monitor, and do not infer that one household reading represents an entire town.
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- Designed for Trend Detection, Not Just Spot Readings – Track PM2.5 and HCHO fluctuations to identify pollution sources like cooking, incense, or renovation fumes. Built-in 12-hour trend histogram helps you spot peaks and verify ventilation effectiveness instantly.
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- Pre-Calibrated & Ready to Use – Factory-calibrated for hassle-free startup. For most accurate readings, avoid using alcohol, perfumes, disinfectant sprays, or strong cleaning agents near the device during testing. Also allow 10 minutes for warm-up after moving between hot and cold environments – this ensures stable, reliable data every time.
When coverage is sparse, combine the closest available PM2.5 value with its trend, the distance to your location, and the Smoke Outlook if one is available. The smoke-plume layer can add geographic context, but it still cannot replace a ground-level measurement.
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Using a phone
The free AirNow app provides current and forecast air-quality information and access to the smoke map. In the app, tap the smoke icon to open the map, search for your location, and select the nearby PM2.5 icon just as you would on the web. Forecast information helps with planning, while the selected monitor’s current value and timestamp describe conditions now.
Keep the app or map available during an active event and check again after a noticeable change in smoke, wind, or visibility. A saved screenshot can become stale quickly; always look at the timestamp before relying on it.
Troubleshooting common situations
The map shows smoke, but my monitor is low
Check whether the plume is satellite-detected smoke aloft, whether clouds or nighttime observation limit the satellite layer, and whether the selected monitor is current. A plume alone does not establish ground-level pollution.
The main AirNow dial looks better than the smoke map
Open the Fire and Smoke Map and select the PM2.5 source. The dial may be using ozone or may lack a nearby PM2.5 monitor, while the smoke map includes temporary monitors and sensors.
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There is no icon at my exact address
Search nearby areas and inspect all permanent, temporary, and sensor icons. Compare distance and timestamps. If no useful source is close, use the nearest available PM2.5 reading with its limitations clearly in mind and check any available Smoke Outlook.
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- Know your air – An Alexa air quality monitor that makes it easy to understand what’s in your indoor air.
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Two nearby icons show different AQI values
Compare pollutant, source type, location, timestamp, and trend. Short-distance variation and rapidly changing smoke can produce genuine differences. Do not merge the values into an average that the map does not report.
The value has not changed, but conditions look different outside
Verify the timestamp and refresh the map. Smoke can change quickly, and a delayed or distant measurement may not capture a local shift immediately. Look at the same-day history and trend after refreshing.
I smell smoke but cannot see a plume
Use the PM2.5 reading rather than visibility or smell. Satellite plumes can be hidden by darkness or clouds, and odor alone does not quantify the particle concentration at ground level.
For readers outside the United States
The procedure and AQI categories above describe U.S.-focused AirNow and EPA resources. If you are elsewhere, use your national, regional, or local environmental or public-health agency’s PM2.5 reporting system and follow its scale and health guidance. Names, thresholds, monitor coverage, and alerts can differ by country.
A practical checking routine
- Open the AirNow Fire and Smoke Map and search the place where you will be.
- Select the nearest PM2.5 monitor or sensor and note its AQI, timestamp, same-day history, and trend.
- Check the category-specific recommendations displayed in the panel.
- Compare nearby sources by pollutant, measurement type, distance, and time if values differ.
- Use the Smoke Outlook for several-day planning when one is available, but use the current PM2.5 value for conditions now.
- Refresh whenever smoke or weather changes and before making a new outdoor plan.
This routine answers the specific question—whether wildfire smoke is affecting the air at your location—using the closest available PM2.5 evidence rather than a visual impression or a regional dial that may represent a different pollutant.
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