The first call after a Cajon Pass smoke event usually comes 48 hours in, when the homeowner notices the kitchen still smells like a campfire. By then, the outdoor map has cleared and the visible plume has moved on, but the home’s HVAC (Heating, Ventilation, and Air Conditioning) system has been recirculating PM2.5 (fine particulate matter 2.5 microns or smaller) through every register for two days. We’ve been answering that call across San Bernardino County for years. Use this page two ways: first, to find the live map and the source agencies that update it, and second, to follow the same indoor-air checklist we use on every service call when the Air Quality Index (AQI) starts climbing.
TL;DR Quick Answers
Federal and state agencies refresh San Bernardino County’s wildfire and smoke conditions in real time, with PM2.5 and AQI readings updating as fires move through the San Bernardino National Forest, Cajon Pass, and the surrounding foothills. A fire 40 miles from your home can reach your living room within hours, which is why we treat the live map as the start of the response, not the end of it.
- See the live map: AirNow Fire and Smoke Map for current PM2.5 readings and fire icons
- Check incident detail: CAL FIRE Incidents page for active fires in the San Bernardino Unit
- Smoke moves fastest through Cajon Pass and the Inland Empire wind corridors
- AQI 100 is when sealing the home and switching HVAC behavior become the priority
- Close windows, run your HVAC system in recirculate mode, and load a MERV-13 (Minimum Efficiency Reporting Value of 13) filter when smoke is visible
Top Takeaways
- The AirNow Fire and Smoke Map gives the cleanest live view of San Bernardino County conditions
- Smoke moving through Cajon Pass and the Inland Empire arrives ahead of the visible plume in most events
- AQI 100 is the threshold where sealing the home and upgrading filtration become non-negotiable
- MERV-13 filters, recirculate-mode HVAC, and a portable HEPA (High-Efficiency Particulate Air) unit form the indoor defense
- Post-wildfire duct inspection matters because soot residue continues off-gassing for weeks
Table of Contents
How to Read Today’s San Bernardino Wildfire and Smoke Map
Open the AirNow Fire and Smoke Map first. You’ll see PM2.5 readings as colored circles across the region, fire icons marking confirmed incidents, and smoke plume overlays showing direction and reach. Larger circles mean more reliable monitor data behind the reading. The CAL FIRE Incidents page handles the second half of the picture: containment percentages, evacuation status, acreage, and damage assessment for any fire under CAL FIRE jurisdiction in the San Bernardino Unit.
Both maps are essential reading on every smoke event. Map data lags real conditions by 15 to 60 minutes, so we always pair the screen with two analog checks: a sky look and a smell test. If you can smell smoke before the dot on your ZIP code turns orange, trust your nose first.
Where Wildfires Burn in San Bernardino County and How Smoke Travels
San Bernardino County is one of the most wildfire-prone regions in the country, with the highest concentration of active fire risk along the urban-wildland interface around Devore, Lytle Creek, Crestline, Lake Arrowhead, Big Bear, and Yucaipa. Smoke from any of these zones can move into the San Bernardino Valley through Cajon Pass, settle in low elevations during inversions, and stay in the basin long after the source fire is out.
Wind patterns shape the indoor problem. Santa Ana events push smoke from the forest down through the valley toward the Inland Empire. Onshore flow can pull smoke from coastal Los Angeles County and Orange County fires inland into our basin. We track cross-county smoke through Filterbuy: San Bernardino County Live Wildfire and Smoke Map when fires are burning to our west, since plumes from Orange County frequently reach Inland Empire ZIP codes within a few hours.
Direction matters. Smoke from the north usually traces back to San Bernardino National Forest activity. Eastern smoke points to Morongo Basin or Yucca Valley sources, and smoke arriving from the west typically means a Los Angeles or Orange County fire is drifting inland.
What Today’s Smoke Means for Your Indoor Air
Wildfire smoke is mostly PM2.5, particles small enough to slip through standard fiberglass filters and recirculate through the home for hours. On every San Bernardino smoke event we work, homes running MERV-8 filters or below show measurable indoor PM2.5 within 2 to 4 hours of any door opening. The smoke does not have to be visible to be measurable.
The action list is short and works:
- Close every exterior door and window. Check the dryer vent and bathroom fan dampers for leaks
- Switch your HVAC system to recirculate. If your system has a fresh-air intake, close the damper
- Upgrade to a MERV-13 filter if your unit supports it
- Run a portable HEPA unit in primary bedrooms
- Pick one room, seal the gaps, and treat it as the clean-air room
When AQI Changes What You Should Do
The Air Quality Index converts pollutant readings into a 0 to 500 scale across six health-risk categories. We use those bands to tell people what action makes sense at what level. Read the day’s AQI and respond based on the table below.
| AQI Range | Category | What We Recommend Indoors |
| 0 to 50 | Good | Normal operation. No special action |
| 51 to 100 | Moderate | Sensitive groups limit prolonged outdoor exposure |
| 101 to 150 | Unhealthy for Sensitive Groups | Close windows, switch HVAC to recirculate |
| 151 to 200 | Unhealthy | Run MERV-13 and portable HEPA, limit door openings |
| 201 to 300 | Very Unhealthy | Set up a clean-air room, avoid outdoor exposure |
| 301 and above | Hazardous | Stay indoors, follow evacuation orders if issued |
When AQI crosses 100, the indoor strategy stops being optional. Above 200, most homes have only one reliable safe space, and that is the sealed clean-air room.
“On every post-wildfire inspection we run in San Bernardino County, we find soot loading on return-side duct walls that was not there before the smoke event, and that residue is the reason indoor air rarely returns to normal on its own.”
Essential Resources for San Bernardino Wildfire and Smoke Tracking
We pull from these every time a smoke advisory hits the Inland Empire. Each one earns its place.
- AirNow Fire and Smoke Map: The federal map we open first on every smoke event. Real-time PM2.5 monitor data, satellite-detected fire icons, and smoke plume overlays. The EPA and the U.S. Forest Service maintain it jointly.
- CAL FIRE: Incidents: California’s official live incident page. Acreage, containment percentages, evacuation orders, and damage assessment for any fire CAL FIRE manages in the San Bernardino Unit.
- InciWeb: Incident Information System: The federal interagency system for wildfires on federal lands. We use this for fires inside the San Bernardino National Forest where CAL FIRE may not be the lead agency.
- South Coast AQMD: Air Quality Advisories: The regional air agency for San Bernardino County. Smoke advisories here are specific to our basin and tell you when forecasters expect AQI to cross category thresholds.
- U.S. Forest Service: San Bernardino National Forest Fire Information: Forest-level alerts, closures, and prescribed burn notices for one of the most fire-prone forests in Southern California.
- California Air Resources Board: Smoke Ready California: The state’s wildfire smoke preparedness hub. Strong on indoor protection, MERV guidance, and HVAC settings during active smoke events.
- National Interagency Fire Center: Federal coordination point for wildland fire information across the country. We check this for context when multiple Western states are burning at once and smoke is moving regionally.
Statistics That Show Why Wildfire Smoke Demands an Indoor Response
These three sources are why we treat every smoke advisory as a home-air problem, not just an outdoor-air problem.
- The U.S. Environmental Protection Agency: Health Effects Attributed to Wildfire Smoke documents that short-term PM2.5 exposure from wildfire smoke can drive respiratory and cardiovascular outcomes, including asthma exacerbation, heart failure, and premature mortality. The same fine particles that turn the sky orange are the ones we filter out of homes for weeks afterward.
- The Centers for Disease Control and Prevention: Safety Guidelines for Wildfires and Wildfire Smoke reports that wildfire smoke can travel far from where fires burn and affect anyone, with elevated risk for children, pregnant individuals, and people with chronic heart, lung, or kidney conditions. Distance from the fire does not guarantee safety anywhere in the Inland Empire.
- The U.S. Environmental Protection Agency: Increasing Impacts of Wildfire Smoke shows that wildfire smoke now contributes substantial PM2.5 across air quality monitors in the United States and is reversing decades of progress on outdoor air quality in many regions. The trend line is the strongest argument we know for treating indoor filtration as standard equipment, not an emergency upgrade.
Final Thoughts and Opinion
Outdoor maps tell you what is burning. They do not tell you what is now circulating through your return duct, settling on your evaporator coil, or coating your filter media. That second story decides how your family breathes for the next two weeks. Our position is direct: the home is the second front line during every San Bernardino wildfire event, and the only one most families have any real control over. Track the map, plan for what it cannot show you, seal the home before the AQI peaks, and inspect the duct system once outdoor conditions clear.
Frequently Asked Questions
Where can I see a live wildfire and smoke map for San Bernardino today?
The AirNow Fire and Smoke Map is the most reliable source for live conditions. It shows current PM2.5 readings, fire locations, and smoke plumes across San Bernardino County in near real time. Pair it with the CAL FIRE Incidents page for incident-level detail like acreage, containment, and evacuation status.
How do I know if wildfire smoke is affecting my home in San Bernardino County?
Trust your senses first. If you smell smoke indoors or your eyes sting, smoke is in the home. Confirm it with AirNow’s PM2.5 reading for your ZIP code. On every smoke event we work, indoor PM2.5 starts climbing within hours of outdoor levels rising, even with the windows closed.
What MERV rating should I use during a San Bernardino wildfire?
MERV-13 is the threshold that captures the fine PM2.5 particles dominating wildfire smoke. Run MERV-13 if your HVAC system supports it without restricting airflow. If your unit is older or rated only for MERV-8, pair the existing filter with a portable HEPA air cleaner in your most-used rooms rather than forcing a higher MERV than your system can handle.
Should I run my AC during a wildfire smoke event?
Yes, with the system set to recirculate, not fresh-air intake. The California Air Resources Board recommends keeping central HVAC running continuously during smoke events so the filter has more chances to capture particles. Confirm your fresh-air damper is closed and your filter is rated MERV-13 or paired with a portable HEPA.
Do I need to clean my air ducts after a wildfire smoke event in the Inland Empire?
Often, yes. Smoke residue accumulates on duct walls, return registers, and coil surfaces, and continues to off-gas into the home for weeks after outdoor conditions clear. We see this on every post-wildfire inspection in San Bernardino County. If the smell lingers indoors after the smoke clears outside, schedule a duct inspection to confirm what the system pulled in.
Schedule Your Post-Wildfire Duct Inspection With DuctsHub
After every San Bernardino smoke advisory, we get calls from homeowners who can still smell smoke indoors two weeks later. The smell is real, and so is the soot loading we find on the return-side ducts when we open them up. Schedule a post-wildfire duct inspection with DuctsHub and let us check what the smoke left behind. When it comes to your home’s air, we don’t cut corners, we clean them.