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Particle size matters: why wildfire smoke is so harmful

A smokey haze surrounds the Soldiers and Sailors Monument in New Haven as smoke from Canadian wildfires moves over the state on June 8, 2023.
Ryan Caron King
/
Connecticut Public
A smokey haze surrounds the Soldiers and Sailors Monument in New Haven as smoke from Canadian wildfires moves over the state on June 8, 2023.

Maine's air quality continues to suffer from lingering Canadian wildfire smoke. We asked health experts why exposure to smoky air is so harmful to our health.

Wildfire smoke contains a cocktail of toxic pollutants. But Dr. Neelu Tummala, an ear, nose and throat specialist based in New York City, said the biggest threat is what's called "PM 2.5" — the fine particulate matter less than 2.5 microns in size.

"The size matters because when people breath in these particles, they're small enough to bypass the upper airway and travel down into the lungs," said Dr. Tummala. And eventually, they enter into the bloodstream.

Dr. Tummala said these foreign particles can end up triggering the immune system and causing inflammation, which is especially risky for children, seniors, and those with underlying heart and respiratory conditions.

Air across Maine is considered "unhealthy for sensitive groups" on Monday, but the state Department of Environmental Protection is forecasting an improvement in particle pollution on Tuesday especially for those in northern and eastern regions.

Nora Saks is a Maine Public Radio news reporter. Before joining Maine Public, Nora worked as a reporter, host and podcast producer at Montana Public Radio, WBUR-Boston, and KFSK in Petersburg, Alaska. She has also taught audio storytelling at the Salt Institute for Documentary Studies (of which she is a proud alum), written and edited stories for Down East magazine, and collaborated on oral history projects.