In February 2013, Michael Lipsett, M.D., Chief of the Environmental Health Investigations Branch of the California Department of Public Health wrote to the California Coastal Commission on the subject of wood burning bonfires. He describes the many health impacts of exposure to woodsmoke,
Ranging from irritation of the eyes and respiratory tract, to serious lung infections, exacerbation of asthma and other chronic lung disease. PM2.5, a constituent of wood smoke, is associated with circulatory disease, heart attacks, stroke and death. It is unquestionable that combustion-related PM2.5 contributes to these outcomes.