It was the second time Bein says he was unable to gather ­post-wildfire research in a field so new public safety agencies have not yet developed procedures for allowing scientists into restricted areas.

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Fires like the one that razed Paradise in November burn thousands of pounds of wiring, plastic pipes and building materials, leaving dangerous chemicals in the air, soil and water. Lead paint, burned asbestos and even melted refrigerators from tens of thousands of households only add to the danger, public health experts say.

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Bein’s experience highlights the difficulties in assessing the impact of today’s massive disasters, whether wildfires that burn entire towns or flooding after major hurricanes, incidents that scientists say are becoming more common because of climate change.

“Everything that we’re doing, it feels like this is a question nobody has asked before, and we have no answers,” said Irva ­Hertz-Picciotto, director of the Environmental Health Sciences Center at the Davis campus.

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Researchers are examining soil tested for the presence of chemical compounds in neighborhoods destroyed by the 2017 wildfire that swept into Santa Rosa, in California’s Sonoma County north of the Bay Area, and comparing it to uninhabited land nearby where only trees had burned, ­Hertz-Picciotto said. In that still-uncompleted study, researchers found nearly 2,000 more chemical compounds in the soil than in uninhabited parkland nearby. Researchers are now working to identify the compounds.

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While scientists have studied wildfires for decades — learning much about the impact on air, soil and nearby ecosystems — fires that race from the forest into large urban communities were, until recently, exceedingly rare.

As natural disasters increase in scope and frequency, public health researchers across the United States are developing new lines of inquiry with unusual speed.

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Scientists, many of them funded by the National Institute of Environmental Health Sciences (NIEHS), are studying pregnant women exposed to polluted air and water after Hurricane Harvey hit Houston in 2017; residents of Puerto Rico forced to live in unrepaired homes where mold and fungus grew after Hurricane Maria in 2017; and eggs from backyard chickens that ate California wildfire ash, among other topics.

“It’s fundamentally critical that we be able to understand these situations and the risks to populations both in the short term and in the long term,” said NIEHS senior medical adviser Aubrey Miller, who is helping to develop quick-response disaster research cutting across scientific specialties.

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To do that, NIEHS has sped up the time it needs to fund research, from months or years to as little as 120 days, said Gwen Collman, who directs the agency’s work with outside researchers.

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At UC-Davis, where researchers are studying eggs from backyard chickens that may have breathed smoke and pecked at ash in areas affected by wildfires, the work is complicated.

“In an urban fire, you’re dealing with contaminants that don’t go away — arsenic, heavy metals, copper, lead, transformer fluid, brake fluid, fire retardant,” said veterinarian Maurice Pitesky, who is leading the study.

Any contaminants found in the eggs could stem from other factors such as the proximity of the home to a factory, a waste disposal site or a highway, he said.

In an as-yet-uncompleted study, researchers have tested eggs sent by individual owners of roughly 350 backyard properties concerned about possible contamination from wildfires and other causes, researcher Todd Kelman said. The locations of the yards were mapped to see which homeowners lived near wildfire areas, and the eggs were tested to see if they have high levels of contaminants such as lead, cadmium and other chemicals associated with human buildings and activities.

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One recent morning, teams from the Environmental Protection Agency in white hazmat suits combed through Paradise, loading seared paint cans, partially melted pesticide containers and the remains of propane tanks onto trucks to be hauled away.

Rusty Harris Bishop, a toxics expert with the EPA who worked on the Paradise cleanup, said removal teams take away whatever contaminants they find, including melted pipes or asbestos-laden construction materials, going beyond the older definition of hazardous household waste.

But cleanup protocols after such disasters are evolving along with the public health science, he said.

That gap in knowledge concerns researchers such as Bein, who plans to train as a firefighter to get access to the burned areas in the next big blaze.

“As these types of fires become more frequent in nature, where instead of once every decade it’s once every summer . . . then we really need to know how this is going to affect health,” Bein said.