Characterization of the dust/smoke aerosol that settled east of the World Trade Center (WTC) in lower Manhattan after the collapse of the WTC 11 September 2001.
The explosion and collapse of the World Trade Center (WTC) was a catastrophic event that produced an aerosol plume impacting many workers, residents, and commuters during the first few days after 11 September 2001. Three bulk samples of the total settled dust and smoke were collected at weather-protected locations east of the WTC on 16 and 17 September 2001; these samples are representative of the generated material that settled immediately after the explosion and fire and the concurrent collapse of the two structures. We analyzed each sample, not differentiated by particle size, for inorganic and organic composition. In the inorganic analyses, we identified metals, radionuclides, ionic species, asbestos, and inorganic species. In the organic analyses, we identified polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls, polychlorinated dibenzodioxins, polychlorinated dibenzofurans, pesticides, phthalate esters, brominated diphenyl ethers, and other hydrocarbons. Each sample had a basic pH. Asbestos levels ranged from 0.8% to 3.0% of the mass, the PAHs were > 0.1% of the mass, and lead ranged from 101 to 625 microg/g. The content and distribution of material was indicative of a complex mixture of building debris and combustion products in the resulting plume. These three samples were composed primarily of construction materials, soot, paint (leaded and unleaded), and glass fibers (mineral wool and fiberglass). Levels of hydrocarbons indicated unburned or partially burned jet fuel, plastic, cellulose, and other materials that were ignited by the fire. In morphologic analyses we found that a majority of the mass was fibrous and composed of many types of fibers (e.g., mineral wool, fiberglass, asbestos, wood, paper, and cotton). The particles were separated into size classifications by gravimetric and aerodynamic methods. Material < 2.5 microm in aerodynamic diameter was 0.88-1.98% of the total mass. The largest mass concentrations were > 53 microm in diameter. The results obtained from these samples can be used to understand the contact and types of exposures to this unprecedented complex mixture experienced by the surviving residents, commuters, and rescue workers directly affected by the plume from 11 to 12 September and the evaluations of any acute or long-term health effects from resuspendable dust and smoke to the residents, commuters, and local workers, as well as from the materials released after 11 September until the fires were extinguished. Further, these results support the need to have the interior of residences, buildings, and their respective HVAC systems professionally cleaned to reduce long-term residential risks before rehabitation.
Lioy
Paul J
PJ
Environmental and Occupational Health Sciences Institute of New Jersey, UMDNJ-Robert Wood Johnson Medical School and Rutgers University, New Brunswick, New Jersey, USA. plioy@eohsi.rutgers.edu
Weisel
Clifford P
CP
Millette
James R
JR
Eisenreich
Steven
S
Vallero
Daniel
D
Offenberg
John
J
Buckley
Brian
B
Turpin
Barbara
B
Zhong
Mianhua
M
Cohen
Mitchell D
MD
Prophete
Colette
C
Yang
Ill
I
Stiles
Robert
R
Chee
Glen
G
Johnson
Willie
W
Porcja
Robert
R
Alimokhtari
Shahnaz
S
Hale
Robert C
RC
Weschler
Charles
C
Chen
Lung Chi
LC
D000336:Aerosols; D000393:Air Pollutants / Q000032:analysis*; D000401:Aircraft; D003252:Construction Materials; D004391:Dust; D004784:Environmental Monitoring; D005390:Fires; D006801:Humans; D006838:Hydrocarbons; D019016:Mineral Fibers; D009519:New York City; D010150:Paint; D023481:Terrorism
D000336:Aerosols; D000393:Air Pollutants; D004391:Dust; D006838:Hydrocarbons; D019016:Mineral Fibers