|
Air Today . . . Gone Tomorrow Article Ground Zero fumes
'brutal': air quality expert
By CBC News, September 11, 2003
NEW YORK - Debris from the World Trade
Center contained dangerous forms of pollutants able to penetrate deep into the lungs of
workers at the site, scientists say.
Researchers developed a model to estimate the type of pollutants at Ground Zero. Earlier
studies were based on particles collected about 1.6 kilometres, about a mile, from the
site.
"The debris pile acted like a chemical factory," said Thomas Cahill, a professor
emeritus of physics and atmospheric science at the University of California Davis in a
release.
"It cooked together the components of the buildings and their contents, including
enormous numbers of computers, and gave off gases of toxic metals, acids and organics for
at least six weeks."
Cahill, the study's lead author, summarized the study at the American Chemical Society's
national meeting in New York City on Wednesday. He calls the conditions "brutal"
for people working at Ground Zero without respirators. Those working or living in
neighbouring buildings would have been slightly better off.
"I have sampled approximately 7,000 samples of very fine aerosols from Kuwait and
China and Africa and so on," said Cahill. "October 3rd was the worst."
The new, more detailed study builds on the group's earlier analysis of more than 8,000 air
samples collected Oct. 2 to 30, 2001, from a mile north-northeast of Ground Zero.
The team, called the UC DELTA group, found very high levels of tiny airborne particles the
U.S Environmental Protection Agency says can raise a person's risk of lung damage and
heart attacks.
Wednesday's study added samples collected through May 2002, as well as a timeline
explaining the results.
The researchers identified four classes of particles the EPA says are likely to damage
human health:
Fine and very fine transition metals, which interfere with lung chemistry
Acids, such as sulphuric acid, which attack cilia and lung cells directly
Very fine, insoluble particles of glass, which travel through the lungs to the bloodstream
and heart
High-temperature organic matter, many components of which are known to be carcinogens
The analysis has been accepted for publication in the journal, Aerosol Science and
Technology.
The good news is the damage could have been worse. Since the ground was hot, the plume
rose high into the atmosphere instead of lingering in the streets of Manhattan, said Prof.
Paul Lioy of the Environmental and Occupational Health Sciences Institute in New Jersey.
FAIR USE NOTICE
This article contains copyrighted material, the use of which has not always been
specifically authorized by the copyright owner. I am making such material
available in my efforts to advance understanding of democracy, economic,
environmental, human rights, political, scientific, and social justice issues,
among others. I believe this constitutes a 'fair use' of any such copyrighted
material as provided for in section 107 of the US Copyright Law. In accordance
with Title 17 U.S.C. Section
107, the material in this article is distributed without profit for research
and educational purposes. Take me back to learn more |
|
|