When the hills above Los Angeles exploded in flames early last month, Matt Rahn snapped into action.

Rahn, though, isn’t a firefighter who was called into duty to help battle what became one of the biggest and most destructive fires in California history. Rather, he’s a wildfire researcher at Cal State San Marcos who, in 2019, created a unique degree program called Wildfire Science and the Urban Interface. He’s also the executive director of the Wildfire Conservancy, a nonprofit research foundation dedicated to serving the state’s firefighters and protecting its communities.

The wildfires that devastated the L.A. area, and even caused minor damage in pockets of San Diego County, have been contained. But the significant problem of grappling with ever larger and more dangerous fires fueled by climate change is only growing worse, and Rahn can be found permanently stationed on the front lines of that fight.

Question: What was the nature of the work you were doing during the L.A. fires last month?

Matt Rahn: I and my team at the Wildfire Conservancy have been doing research related to firefighter health and safety. Specifically, we have been conducting an exposure study related to the toxic, hazardous and carcinogenic materials firefighters are exposed to in a wildland urban interface fire. We are collecting data on exposures using silicon wrist bands (as a passive sampling device that is extremely good at absorbing all the contaminants firefighters are exposed to). We compare these to urine and blood samples taken from firefighters to track exposure to substances like polycyclic aromatic hydrocarbons (or PAHs), volatile organic compounds (or VOCs), heavy metals and other compounds. We use a variety of techniques, including micro RNA analysis that can measure the change in gene expression, particularly those responsible for either causing (or suppressing) cancer. 

Q: What was your reaction when you first heard about the fires? Could you have imagined that it would ever get that bad in the nation’s second-most-populous city?

MR: Sadly, I wasn’t shocked. For over 10 years now, we have been saying what is now common vernacular: We no longer have a “fire season,” we have a year-round fire risk. And we no longer have “wildfires” but rather fires in the wildland urban interface (or WUI), which is the area where human development and infrastructure meet undeveloped wildland or natural areas. But this change began much longer ago. 

In 1991, in a remarkable and singularly cataclysmic event, the Oakland Hills became engulfed by a devastating fire that resulted in 3,280 homes lost, 25 fatalities and 1,520 acres burned. At that time, the loss was unthinkable; by today’s standards, the Oakland Hills fire, while still tragic, is certainly not the largest of its kind. That resulted in renewed recognition of the dangers posed by fires in the WUI and prompted new research and development into improved prevention and suppression methods, policy, and procedure of these kinds of fires. Unfortunately, that focus was short-lived, and over a decade would pass until California experienced another devastating wildfire, this time in San Diego County, that would grab national attention. 

Engulfing more than 280,000 acres, destroying 3,241 homes and causing the loss of 16 lives, the 2003 Cedar fire surpassed all records and became the most devastating fire in California’s history. With a total economic loss of nearly $2.5 billion, we realized that the devastation was not contained to acres burned; the fiscal impacts to our communities far outweighed the actual cost of fighting this megafire. Even with a peak of 6,635 firefighters battling the blaze, suppression was less than 2% of the total cost of that wildfire incident.

For more context, since 1970, the U.S. has witnessed a roughly 300% increase in acres burned each year. Fifty years ago, wildfires would burn about 3 million acres per year across the entire U.S.; today, a single fire in California can consume one-third of that historic national acreage. So, fast forward to the fires in Paradise, California in 2018 and the 2023 fires in Maui, where over 100 people lost their lives. Sadly, we all should have seen this coming.

Q: Do you think there’s any merit to the criticism that city officials could have done more to keep the fires from getting so out of control? Or was this strictly a scenario of worst-case environmental conditions?

MR: Persistent drought, hot and dry temperatures, and extremely high winds in a community not built to modern standards for wildfire-prone areas were dangerous starting conditions for any fire event. The high winds provided an extremely short opportunity to prevent a conflagration. These winds also prevented the use of aerial attacks in the early stages of the fire. Fire agencies were left with ground resources, battling one of the most difficult and hazardous fire storms in U.S. history. Given the extreme fire behavior and conditions, the ultimate suppression and containment of the fires and prevention of additional losses was due in large part to the remarkable firefighter staffing and surge capacity that was mobilized. 

Q: If I’m remembering correctly, the worst fires in the state over the last decade or so have been in Northern California, including the Camp fire in 2018. Do you think Southern Californians had acquired a false sense of security and complacency?

MR: Unfortunately, many communities acquire a false sense of security and complacency. We see this year after year. When there is smoke in the air and a major incident that galvanizes our communities, state and nation, all the attention is given to that fire, with a collective promise that we will not forget and will work to keep our communities safe. But as time passes (and in some cases, not much time can pass), communities become lax in their collective efforts for fuel reduction programs, maintaining defensible space or other factors that can significantly contribute to community resilience. We cannot allow this to occur. 

In fact, the Wildfire Conservancy along with some of our instructors in the Wildfire Science and the Urban Interface degree at CSUSM have teamed up to address this exact issue. We were awarded a grant from the FEMA Fire Prevention and Safety program in support of community resilience and advanced training support for Maui. Together with the County of Maui and Maui’s fire department, emergency operations and community associations, the Wildfire Conservancy will build on existing programs with the Responding to the Interface (RTI) program (from Cal Fire and the International Association of Fire Fighters) as the foundation for working with high-risk communities to develop a comprehensive and customized WUI firefighter training tailored to Maui and its communities, and create an annual event that is designed to improve community resilience, awareness, outreach and education. We are working to bring this effort to a national stage starting with Maui and continuing to California and beyond. 

Q: What have you heard from the fire crews that were battling the blazes in L.A.?

Q: How long have you been a scholar and researcher of wildfire science? How did you first get involved in it as a discipline?

Q: How has the field evolved over the years as wildfires have gotten bigger and more destructive?

Q: How would you describe CSUSM’s wildfire science program and what it does?

MR: The degree program is unique. It’s focused on the WUI as its primary mission, educating our next generation of firefighters to deal with the unique issues related to these kinds of incidents. Clearly there is a need, and that need is growing. It is no longer just a California issue or something that is particular to the western U.S. Nearly every community in the nation has some kind of risk related to WUI fires. Providing the training and education for that growing risk is critically important. 

What makes this program unique is that it was designed with firefighters and key agencies, including Cal Fire, the fire departments of San Diego and L.A., the U.S. Forest Service, NIST, and many other departments from around the country. We designed our curriculum based on their input, and it includes coursework in community planning and resilience, firefighter health and safety, wildfire law and economics, kinesiology and fitness, and even emerging tools and technologies. Our program also offers a course in firefighter mental and behavioral health, the first of its kind in the nation. The program is designed for working professionals, is fully online and has the ability to put a pause on coursework for students who may be deployed to major incidents during the semester. And yes, several of our own students were working on the L.A. fires. 

We are lucky to have some of the foremost experts as instructors for some of the more specialized courses, and several remarkable faculty members at CSUSM also are teaching in this program. One last thing I should mention is that each student, at the end of their last semester, works with us to conduct their own “senior thesis” and research project focused on WUI issues. I’m happy to say that three of our former students will publish their research papers in the new Journal of the Wildfire Conservancy, a new science journal produced through the CSU system.

Q: CalMatters did an award-winning investigative series called “Trial by Fire” in 2022 about the traumatic toll of wildfires on firefighters, almost akin to being in war. How concerned are you about that, and what are some steps you’d recommend to deal with it?

Q: I know funding, and the lack thereof, is a big part of this, but how would you like to see firefighting improve to confront the threat posed by bigger wildfires fueled by climate change?

Q: What lessons are you taking away from the L.A. fires? Should we be rebuilding in these fire-devastated areas? How can we make such communities more resilient?

MR: We as humans tend to build in high-risk areas, whether they are fire-prone or at risk from floods, earthquakes, tornadoes or hurricanes. We have made remarkable strides in addressing community resilience and facility-hardening across many of these high-risk areas, including wildfires. We know what can and does work, and considerable investments are being made to develop new materials, designs and strategies to increase protection. However, none of this works if we continue to allow for poor planning and fail to provide for programs to help improve and retrofit existing communities. It will continue to fail if we don’t take our commitment to fuel management and defensible space seriously. And it will fail if we don’t take immediate action finally to fund a full-time, year-round fire service through Cal Fire and provide our struggling fire agencies the staffing and resources they need to do their job. In addition, we desperately need a significant overhaul to California’s insurance laws and regulations. Each of these issues by itself is not a solution and can easily fail when handled alone. However, if we think of each issue as a separate stick, when they are bundled together, they form a stronger and more resilient unit. We are all in this together. 

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Brian Hiro, Communications Specialist

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