Asthma-Associated Emergency Department Visits During the Canadian Wildfire Smoke Episodes - United States, April- August 2023.

During April 30-August 4, 2023, smoke originating from wildfires in Canada affected most of the contiguous United States. CDC used National Syndromic Surveillance Program data to assess numbers and percentages of asthma-associated emergency department (ED) visits on days with wildfire smoke, compared with days without wildfire smoke. Wildfire smoke days were defined as days when concentrations of particulate matter (particles generally ≤2.5 μm in aerodynamic diameter) (PM

Déclaration de conflit d'intérêts

All authors have completed and submitted the International Committee of Medical Journal Editors form for disclosure of potential conflicts of interest. Jason D. Sacks reports support from the European Respiratory Society to travel to and participate in the meeting, Clean Air in Europe for All Air Pollution and Health: Taking Stock of the Proposed Revisions to the Ambient Air Quality Directive, in Brussels, Belgium in May 2023, and serving as vice chair of the Career Mentoring Committee, American College of Epidemiology. No other potential conflicts of interest were disclosed.