Canadian wildfires led to spike in asthma ER visits, especially in the Northeast

The smoke from Canadian wildfires that drifted into the U.S. led to a spike in people with asthma visiting emergency rooms — particularly in the New York area.

The U.S. Centers for Disease Control and Prevention published two studies Thursday about the health impacts of the smoke, which shrouded city skylines with an orange haze in late spring. A medical journal also released a study this week.

When air quality worsens, “an asthmatic feels it before anyone else,” said Dr. Adrian Pristas, a pulmonologist based in Hazlet, New Jersey, who remembered a flood of calls from patients in June during the days of the heaviest smoke.

People with asthma often wheeze, are breathless, have chest tightness and have either nighttime or early-morning coughing.

“I have no doubt that every asthmatic had an uptick in symptoms,” Pristas said. “Some were able to manage it on their own, but some had to call for help.”

Each of the studies looked at different geographic areas — one was national, one was specific to New York state and the last focused on New York City.

Nationally, asthma-associated ER visits were 17% higher than normal during 19 days of wildfire smoke that occurred between late April and early August, according to one CDC study that drew data from about 4,000 U.S. hospitals.

Hospital traffic rose more dramatically in some parts of the country during wildfire smoke: 46% higher in New York and New Jersey.

A second study released by the CDC focused on New York state only, not New York City, because the state and city have separate hospital data bases, one of the authors said.

It found asthma-associated ER visits jumped 82% statewide on the worst air quality day, June 7. The study also said that the central part of New York state saw the highest increases in ER visits — more than twice as high.