# The wildfire danger we're only just beginning to understand

> Toxic smoke will soon be everyone's problem.
- Title: The wildfire danger we're only just beginning to understand
- Summary: Toxic smoke will soon be everyone's problem. Urban wildfires release toxic chemicals from burning plastics and metals that pose long-term cancer and disease…
- Keywords: wildfires, urban fires, wildland-urban interface, air quality, pm 2.5, toxic smoke, los angeles fires, spokane, public health, cancer risk, firefighters, climate change
- Source: Vox — https://vox.com/future-perfect/503242/urban-wildfire-smoke-health-risks
- Author: Ananya Rupanagunta
- Published: 2026-09-18T10:30:00+00:00
- Read time: 2 min
- Topics: wildfires, urban fires, wildland-urban interface, air quality, pm 2.5, toxic smoke, los angeles fires, spokane, public health, cancer risk, firefighters, climate change
## Wildfires are moving to cities
Fires are no longer confined to remote wilderness. They're rapidly expanding into urban and suburban areas across the country.
## Recent fires hit populated areas
This summer, fires in Spokane demolished over 800 homes. Last year's LA fires burned 37,000 acres and displaced 205,000 people.
## 46 million homes at risk
About one-third of all US homes sit on the edge of fire-prone wildland, exposing millions to dangerous particulate matter.
## PM 2.5 damages health
Particulate matter from fires causes premature death, respiratory damage, and cognitive impairment, especially in older populations.
## Urban smoke is chemically different
When homes and cars burn, fires release toxic chemicals from plastics, metal oxides, and vehicle fuel, not just vegetation smoke.

> What's burning is now very different. So now modern homes have tons of plastic, metals, and all of our electronic appliances.
## California's 2020 fire crisis
The worst California fire year burned 4.2 million acres. Stanford Health saw a 43 percent increase in cardiovascular conditions afterward.
## Fire seasons keep getting worse
In 2025, 5.2 million acres burned across the US. This year, 8.5 million acres have already burned before winter dry seasons.
## Suburban sprawl increases danger
The wildland-urban interface grew 46 percent between 1990 and 2020. More houses in fire zones means more toxic smoke when they burn.
## LA fires released new toxins
Over 16,000 buildings burned, releasing volatile organic compounds, metals, carbon monoxide, and forever chemicals from firefighting foam.
## Indoor air stays contaminated
Chemicals and metals absorb into soft surfaces like pillows. Post-fire VOC levels stayed elevated inside evacuated homes for months.
## Firefighters show genetic changes
Blood samples from fire responders revealed altered tumor suppressor genes linked to gastric cancer and neurodegenerative diseases.
## DNA changes predict future disease
Studies of 9,000 firefighters found altered DNA methylation at sites linked to cancers, neurological disease, and cardiovascular disease.
## Residents face similar risks
People living in fire-prone areas are exposed to the same toxins as firefighters, risking asthma in children and heart problems in adults.
## Toxic metals linger for months
Chromium 6, a carcinogenic metal, was found in LA cleanup zones for two months after fires, and up to nine miles downwind.
## Key takeaway

Urban wildfires release toxic chemicals from burning plastics and metals that pose long-term cancer and disease risks beyond traditional smoke exposure.