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Context of 'September 11, 2003: Study Finds WTC Fire Gases Gave Off Harmful Particles'

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A team of specialists from UC Davis, known as the Detection and Evaluation of Long-range Transport of Aerosols (DELTA) Group, conducts air sampling from the roof of 201 Varick St., located one mile north-northeast of the WTC site, at the request of the Department of Energy. Regional meteorology will suggest that the monitoring equipment’s location at Varick Street probably receives material from the World Trade Center site about half the time. The group’s analysts use seven different techniques to analyze the data including synchrotron-induced X-ray fluorescence, scanning transmission ion microscopy and proton elastic scattering analysis, and soft beta mass measurements and scanning electron microscopy (SEM). DELTA will examine the samples for dozens of substances including carbon-based compounds from burning wood, plastic and carpets; glass shards; and asbestos. DELTA will release summary reports in December (see Early November 2001) and February (see February 11, 2002). [JOM, 12/1/2001; Dateline (Univ of Calif, Davis), 2/15/2002; Chemical and Engineering News, 2/18/2002]

Entity Tags: US Department of Energy, DELTA Group

Timeline Tags: Environmental Impact of 9/11

The Delta Group releases a final report on air quality data collected in Manhattan between October and December, 2001 (see October 2, 2001-Mid-December, 2001). Thomas Cahill, PhD, Delta Group member, is a noted expert on composition and transport of ultra-fine airborne particles. Dr. Cahill explains that World Trade Center aerosols contained high levels of sulfur, sulfur-based compounds, and very fine silicon that probably came from the thousands of tons of glass that had been in the WTC buildings. The presence of these fine particles decreased during the month of October. The largest spike in very fine particle levels measured 58 micrograms per cubic meter which Cahill says was “an extremely high peak.” The sampling also indicated that there were almost always high concentrations of coarse particles—those about 12 micrometers to 5 micrometers in diameter—present in the air near the WTC site. “These particles simply should not be there,” Cahill says. “It had rained, sometimes heavily, on six days in the prior three weeks. That rain should have settled these coarse particles.” He says their presence suggests the hot debris pile was continually generating the larger particles. The study also determined the chemical composition of the dust it sampled. Some of the metals found in the air occurred at the highest levels ever recorded in the United States. Metals present at high levels included iron, titanium (some associated with powdered concrete), vanadium and nickel (often associated with fuel-oil combustion), copper and zinc. Mercury, lead, and asbestos were present at low levels. [On Earth, 2002; Dateline (Univ of Calif, Davis), 2/15/2002; Chemical and Engineering News, 2/18/2002]

Entity Tags: DELTA Group, Thomas Cahill

Timeline Tags: Environmental Impact of 9/11

A team of scientists from the University of California at Davis, known as the DELTA group, complete a study on the composition of the toxic gases released during fires burning at the World Trade Centers following the September 11 attacks. DELTA scientists release their report at a meeting of the American Chemical Society in New York. The study concludes that samples taken from the World Trade Center site contained four types of particles that the EPA considers harmful to human health: ultra-fine particulate matter composed of heavy metals known to cause lung damage, sulfuric acid harmful to pulmonary cells, ultra-fine glass particles that can travel through the lungs to the bloodstream and heart, and high-temperature carcinogenic organic matter. [Reuters, 9/11/2003]

Entity Tags: DELTA Group, Thomas Cahill

Timeline Tags: Environmental Impact of 9/11

Monsanto announces that it will purchase Delta & Pine Land Company, the world’s largest cotton seed company, and the first company to obtain a patent on terminator technology (see March 3, 1998). Monsanto has had its sights on Delta & Pine Land for years. A previous plan to buy the company—announced in 1998 (see May 11, 1998)—fell through in December 1999 (see December 19, 1999). The acquisition means that Monsanto will control over 57 percent of the US cotton seed market. It will also deepen Monsanto’s reach into the developing world, where Delta & Pine Land has subsidiaries in 13 countries—including India, Brazil, Mexico, Turkey, and Pakistan. According to the ETC Group, an outspoken critic of terminator technology, “the takeover means that Monsanto will command a dominant position in one of the world’s most important agricultural trade commodities and that millions of cotton farmers will be under increased pressure to accept genetically modified (GM) cottonseed.” [Monsanto, 8/15/2006; ETC Group, 8/16/2006]

Entity Tags: Monsanto, Delta & Pine Land Company

Timeline Tags: Seeds

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