Ultrafine particle exposure during fire suppression--is it an important contributory factor for coronary heart disease in firefighters?
OBJECTIVE
Coronary heart disease (CHD) is the primary cause of death among US firefighters during fire suppression. In other populations, exposure to respirable particles, including ultrafine particles, has been widely implicated as a risk factor for CHD. This study is the first to report detailed characterization of respirable particles released by combustion of an automobile and model residential structures under firefighter exposure conditions.


METHODS
Characterization was performed when feasible during knockdown and routinely during overhaul.


RESULTS
Ultrafines accounted for >70% of particles in all fire suppression stages, occurring in concentrations exceeding background by factors between 2 (automobile) and 400 (bedroom), consistent among all structures.


CONCLUSIONS
Exposure to ultrafine particles during fire suppression should be considered a potential contributing factor for CHD in firefighters. Of major significance is their predominance during overhaul, where firefighters frequently remove respiratory protection.
Baxter
C Stuart
CS
Department of Environmental Health, University of Cincinnati Academic Medical Center, Cincinnati, Ohio 45267-0056, USA. c.stuart.baxter@uc.edu
Ross
Clara Sue
CS
Fabian
Thomas
T
Borgerson
Jacob L
JL
Shawon
Jamila
J
Gandhi
Pravinray D
PD
Dalton
James M
JM
Lockey
James E
JE
D003327:Coronary Disease / Q000209:etiology; D005390:Fires; D006801:Humans; D016273:Occupational Exposure / Q000009:adverse effects / Q000032:analysis*; D052638:Particulate Matter / Q000009:adverse effects / Q000032:analysis*; D012134:Respiratory Protective Devices; D012306:Risk
D052638:Particulate Matter