In early June 2023, smoke from extensive wildfires in Quebec, Canada, drifted into the U.S. Northeast, triggering significant health issues related to lung conditions.
Researchers analyzing data from 53 hospital emergency departments in New York City noted a nearly 44% increase in visits for asthma-related symptoms during the smoky period, peaking on June 7, the city’s most severely affected day by the Canadian smoke.
Dr. Lawrence MacDonald, chief of pulmonary medicine at DMC Huron Valley Sinai Hospital in Commerce Township, Michigan, observed a similar trend last summer when prolonged Canadian wildfire smoke enveloped the region. “We saw a noticeable rise in asthma exacerbations—patients needing steroids, increased treatments, and ER visits,” he said. “The presence of this airborne particulate matter significantly heightens the risk of illness and symptomatic reactions.”
According to the World Health Organization (WHO), wildfire smoke contains a hazardous mix of pollutants, including fine particulate matter known as PM2.5, nitrogen dioxide, ozone, aromatic hydrocarbons, and lead. These pollutants not only degrade air quality but also contribute to climate change by releasing substantial amounts of carbon dioxide and other greenhouse gases.
PM2.5 particles, smaller than 2.5 microns—thirty times thinner than a human hair—are particularly concerning. They can bypass the body’s natural defenses in the nose, throat, and lungs, penetrating deep into delicate lung tissues and air sacs, potentially causing severe health issues.
Individuals most vulnerable to wildfire smoke’s health impacts include children, the elderly, pregnant women, and those with preexisting conditions like asthma and COPD. The WHO underscores that exposure to PM2.5 from wildfire smoke is linked to premature mortality and exacerbates diseases affecting various organs, including the lungs, heart, brain, skin, and more, with documented effects on cognitive function and memory.
Mitigating exposure is crucial. The Yale School of Public Health’s recent study highlighted increased mortality rates associated with long-term exposure to PM2.5 from wildfire smoke across the contiguous U.S. from 2007 to 2020. Recommendations from environmental experts and agencies like the U.S. Environmental Protection Agency (EPA) include staying indoors with closed doors and windows, using air conditioning with high-efficiency filters, and employing portable air cleaners where possible.
For those without these resources, seeking shelter elsewhere during smoke events is advised, while minimizing indoor air pollution from sources like candles, stoves, or aerosol sprays. Individuals with respiratory or cardiovascular conditions are urged to collaborate closely with healthcare providers to develop effective response plans.
“In cases where ER visits are necessary due to smoke-related health complications, it reflects a gap in treatment planning,” MacDonald emphasized, stressing the importance of proactive management strategies for vulnerable populations.