Wildfire smoke across the U.S.: How to use AirNow and health guidance
Wildfire smoke can travel hundreds of miles and make air feel “clear but unhealthy.” Here’s how to check NOAA smoke tracking, NWS health alerts, and AirNow’s AQI actions.
Wildfire smoke can drift far beyond fire lines—and even when skies look mostly clear, the main risk is fine particles in smoke. The fastest way to decide how much to limit outdoor activity is to combine three federal tools: NOAA’s smoke tracking context, NWS air-health advisories, and the AirNow Fire and Smoke Map (AQI-based actions).
What wildfire smoke is doing (and why it shows up away from fires)
EPA links wildfire smoke health risk to PM2.5—tiny particles that can irritate the airways and make it harder to breathe, especially for people with asthma, COPD, heart disease, and other cardiopulmonary conditions. Exposure risk depends on both the amount of smoke particles and how long you’re exposed.
NOAA’s smoke tracking products help explain what’s happening in the sky. NOAA’s “Smoke/Dust observed in satellite imagery” narrative is built for observations of significant smoke areas—not a precise measurement of smoke amount. In its example from Wednesday, July 01, 2026 (through 1500Z), NOAA described smoke layers moving through parts of northern Canada and southward toward Montana, plus smoke over the U.S. ultimately drifting westward into the Pacific Ocean. NOAA also cautions that the product doesn’t include a quantitative assessment of particulate density/amount and that widespread cloudiness can block detection.
Step 1 (NOAA): Check smoke observations for plume context
Start with NOAA’s “Smoke/Dust observed in satellite imagery” narrative. It’s designed to point out significant smoke areas tied to active fires and smoke that has drifted away from the source. Use it to answer: Where is smoke showing up right now, based on satellite observations?
Step 2 (NWS): Watch for Air Quality Health Advisories when smoke is expected to affect health
When NWS expects smoke to create health impacts, it relays air-health advisory messages (often issued by state or local public health agencies). A typical message follows a clear pattern:
- WHAT: Air Quality Health Advisory for wildfire smoke
- WHERE: Specific counties/areas
- WHEN: The time window when smoke may affect the area
- HEALTH INFORMATION: Who should reduce exertion and what to do
For example, one NWS Air Quality Alert example shows an advisory message for wildfire smoke with a time window of 900 AM Tuesday July 07 through 900 AM Wednesday July 08, and health guidance stating that people with heart or lung disease, older adults, and children should reduce prolonged or heavy exertion.
Step 3 (AirNow): Use the Fire and Smoke Map v4 to translate AQI into “how to adjust your day”
AirNow’s Fire and Smoke Map v4 is built to show:
- Current particle pollution AQI near your location
- Fire locations and, where available, smoke forecast outlooks
- Recommendations linked to AQI categories (developed using EPA air-quality/health expertise)
Map layers matter: AirNow notes that smoke plumes do not automatically appear in this version of the map. To see NOAA smoke plumes, use the map’s settings icon and toggle on “NOAA Smoke Plumes.”
To interpret the map, look at the colored circles (AQI categories for particle pollution): Good (0–50), Moderate (51–100), Unhealthy for Sensitive Groups (101–150), Unhealthy (151–200), Very Unhealthy (201–300), and Hazardous (301+).
When you click an AQI icon, AirNow displays a compact pop-up that includes current air quality, recommended actions, air quality history for the day, and a circle showing whether conditions are stable, improving, or getting worse. If a wildfire Smoke Outlook was issued for the area, an alert may appear in the pop-up as well.
AQI-to-actions: what to do as smoke AQI climbs
EPA’s wildfire smoke guidance provides practical cautionary messages that match AQI categories. Use these as day-to-day planning steps (especially if you’re deciding whether to let kids play outside or whether to exercise outdoors):
- Moderate (51–100): unusually sensitive people should shorten and reduce outdoor physical activity and go indoors to cleaner air if symptoms (like coughing or shortness of breath) show up.
- Unhealthy for Sensitive Groups (101–150): sensitive groups should make outdoor activities shorter and less intense, take more breaks, and go indoors to cleaner air if symptoms develop.
- Unhealthy (151–200): sensitive groups should consider rescheduling or moving physical activities inside to cleaner air; everyone else should keep outdoor physical activities shorter and less intense.
- Very Unhealthy (201–300): sensitive groups should avoid all physical activity outdoors; everyone else should limit outdoor physical activity and go indoors to cleaner air if symptoms appear.
- Hazardous (301+): avoid all physical activity outdoors. If indoor air quality is poor, keep activity levels light. (Sensitive groups should stay indoors in cleaner air and keep activity levels light.)
EPA also emphasizes extra caution for people with heart or lung disease, older adults, children (including teenagers), and pregnant women—especially during prolonged smoke events.
What to watch next
Smoke risk can shift quickly with weather and fire behavior. Keep checking:
- NOAA smoke observations for plume context
- NWS air-health advisories for the time window and the specific health guidance
- AirNow’s Fire and Smoke Map v4 for your current AQI category and AQI-linked action recommendations
If you have symptoms or a high-risk medical condition, follow clinician advice and local health guidance—not just general public-health messaging.
Sources
- AirNow Fire and Smoke Map v4 — How to use
- NOAA OSPO smoke tracking (Smoke/Dust observed in satellite imagery)
- NWS AQA product example (Air Quality Health Advisory for Wildfire Smoke)
- EPA wildfire smoke guidance (2026) — Wildfire Guide for Public Health Officials
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