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"When you burn people's belongings, vehicles, and boats, we don't necessarily have a good understanding of what those chemicals are," said one expert.
Scientists and health officials in Maui County, Hawaii on Mondayurged residents to stay away from the island's western coast if possible to avoid exposure to potential toxins that may have been released following the wildfire that killed at least 96 people and destroyed the historic town of Lahaina.
Officials have not determined exactly what toxins were released as last Tuesday's fire tore through the island and exposed an estimated 86% of Maui's 2,719 structures to the flames, but officials have taken note that a wide array of buildings and objects were burned by the fast-moving wildfire.
"When you burn people's belongings, vehicles, and boats, we don't necessarily have a good understanding of what those chemicals are," Andrew Whelton, director of Purdue University's Center for Plumbing Safety, told the Associated Press on Monday. "When much of that infrastructure burns, it's transformed into other materials that are never meant for human contact."
Hawaii state toxicologist Diana Felton is helping to assess the damage and toldHawaii Public Radio (HPR) on Saturday that the U.S. Environmental Protection Agency and other federal officials will work to remove propane tanks and other clear hazards from Lahaina and the surrounding area.
"It's going to be a long time" before the devastated town is safe for people without protective gear, she said.
On social media, Whelton said that based on previous fires and the toxins that have been released, authorities will need "at least three months, possibly longer," to remove wildfire debris and that soil testing will be needed afterward.
In addition to propane tanks—one of which created a cloud that looked like a "gigantic mushroom" when it exploded in the fire, as a resident told the AP—officials have raised alarm about lead paint and asbestos in the historic buildings that went up in flames, as well as arsenic, which was used in the last century as an herbicide on some sugar and pineapple plantations and may have been released when an estimated 2,170 acres burned last week.
At The Conversation, Whelton wrote Saturday that chemicals including benzene and polycyclic aromatic hydrocarbons are frequently detected in ash following large wildfires. Exposure to high levels of those toxins can cause nausea, vomiting, dizziness, rashes, and respiratory problems.
Whelton told the AP that anyone entering the area is advised to wear protective gear that covers their arms and legs as well as a well-fitting face mask such as an N95.
"If you go back into some zones even where maybe all the fires have been put out, you can then be really exposed," he said. "If there's dust and debris kicked up, you can get it in your eyes, on your hands, or you can inhale it."
The county issued an "unsafe water" alert for parts of Lahaina and the Kula district, warning that tap water could have contaminants even after being boiled. Residents who are not among the 46,000 people who fled the island should rely only on bottled water for cooking and drinking.
"Strange things can happen to the water," Felton told HPR. "I'm optimistic that the water system will be able to be restored, but until we have a better sense of how much, if any, contamination is present, we won't have a timeframe on that."
The safe drinking water branch of the Hawaii Department of Health told HPR that it's planning to conduct testing on drinking water across western Maui.
The Maui fire is just the latest to raise alarm about the after-effects of wildfires, which scientists say are becoming more common and harder to get under control due to environmental factors like dry vegetation and long droughts, driven by the climate crisis.
Earlier this year much of the eastern U.S. was placed under air quality alerts as smoke from wildfires in Canada drifted to the region, raising the risk of exposure to particulate matter pollution, which is linked to heart and lung disease.
One 2017 wildfire in Northern California, which destroyed about 1,200 structures, generated 300,000 tons of debris that included toxic levels of arsenic, cadmium, copper, lead, and mercury.
"In Maui, debris may have to be taken off the island for disposal," Whelton wrote.
Maui County Mayor Richard Bissen told residents in a press conference Saturday that at this point "it is not safe" to return to the parts of the island affected by the blaze.
"We're not doing anybody any favors by letting them back in there quickly, just so they can get sick," he said.
After a massive blaze broke out at a Chevron oil refinery in Richmond, Calif. on Monday officials say more than 900 people have been treated at emergency rooms in the region for symptoms caused by the subsequent toxic smoke that enshrouded the Bay Area. Chevron is now coming under fire for a stunted response to the gas leak which lead to the fire that burned for more than four hours with flames reaching 40 feet in the air.
Thousands of people complaining of ailments caused by smoke inhalation will be attempting to make legal claims. More than 1,000 residents visited a downtown Richmond law office Wednesday, which put out a sign reading 'Chevron claims filed here.' Another 1,000 contacted Chevron directly. Chevron was forced set up a storefront downtown to deal with the onslaught of claims.
"I want enough money so we can move someplace with clean air," Monica Marquez, 28, told the San Francisco Chronicle. Marquez said she and her four children are suffering from wheezing and headaches since Monday's fire. "I've lived here my whole life, but I've had enough. We need to get out and right now we can't afford to."
"The little money they give us isn't going to bring our health back," Constance Delaney, 60, told the Chronicle. Delany said her entire family and most of her friends and neighbors in Richmond, known as an industrial hotbed, suffer from respiratory problems.
"We moved here from San Francisco because we couldn't afford it there anymore. Now we know why Richmond was so cheap. But a few hundred dollars isn't going to help us move somewhere without all this pollution."
Richmond has the lowest per capita income in the Bay Area -- $24,781 annually, 35 percent lower than the Bay Area median. More than a third live below the federal poverty level.
Almost a third of children in Richmond, which is known for industrial pollution, have been hospitalized for asthma -- three times the rate countywide, the Chronicle reports.
Mischa Adkins, 32, of Richmond said she already has lupus and failed kidneys and Monday's smoke only made things worse.
"I've lived through years of Chevron having these problems," she said.
Chevron's Richmond refinery, which has had multiple fires in the past, has been cited by San Francisco Bay area regulators for violating air regulations 93 times in the past five years.
The number has increased from 15 violations in 2007 to 23 in both 2010 and 2011. The refinery is also the state's largest emitter of greenhouse gases.
The long-term impacts the blaze will have on the area's residents is still unknown, according to Andy Katz, director of air quality and government relations for Breathe California.
"There's still really a lot of information left to learn," he said. "This disaster has impacted the health of the community, Richmond residents deserve to know what the long-term impacts will be."
Chevron's response to the refinery fire is currently under criticism.
The gas leak that lead to the blaze started as a drip at about 4:15 p.m. Monday, officials said; however, Chevron failed to act, as it did not treat the leak as an immediate danger to residents nearby. Chevron is required to immediately notify the public of any gas leak, fire or oil spill, according to state law.
Hundreds of people heckled a panel of Chevron and local officials over the issue at a Tuesday night community meeting in Richmond.
Richmond Mayor Gayle McLaughlin said the fire was unacceptable and called for the company to improve its early-warning system.
"We live with the day-to-day risk of this type of manufacturing and refining that has an impact on our community with pollutants being released, but with the accident that happened yesterday, that doesn't mean it's acceptable, because it's not," McLaughlin said.