Chronic exposure to pollution from wildfires has been linked to tens of thousands of deaths annually in the United States, according to a new study. The paper found that from 2006 to 2020, long-term exposure to tiny particulates from wildfire smoke contributed to an average of 24,100 deaths a year in the lower 48 states. “Our message is: Wildfire smoke is very dangerous. It is an increasing threat to human health,” said Yaguang Wei, a study author and assistant professor in the department of environmental medicine at Icahn School of Medicine at Mount Sinai. …“It’s only if we’re doing multiple studies with many different designs that we gain scientific confidence of our outcomes,” said Michael Jerrett, professor of environmental health science at the University of California, Los Angeles. The paper’s researchers focused on deaths linked to chronic exposure to fine particulate matter, or PM2.5 — the main concern from wildfire smoke.