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(This article has been "peer-reviewed.")

He sets out to debunk Dr Wood's work in this new paper.

http://www.journalof911studies.com/volume/200702/Implausibility-Directed...

"I didn't see a lot of dust go into the upper atmosphere. I saw it all come down first, and then it spread out at that point'' GREG JENKINS

''Furthermore, photographic and video evidence does not support that significant amounts of debris moved upwards during either collapse of the World Trade Center towers''. GREG JENKINS

This comment is designed to disprove the 'dustification' argument , but by referring only to the 10 seconds of the 'collapse' time and ignoring the large amount of dust that entered the upper atmosphere subsequently, Dr Jenkins is setting up a straw man.

"The debris field was 6 times the building's footprint''. GREG JENKINS

Another half-truth.In reality a lot of the mass turned to fine powder.

This is how Jim Hoffman summarizes it:

When the South Tower and then the North Tower exploded they each produced vast clouds of dust that first so attenuated the sunlight on the streets below that witnesses described a pitch-black environment. They then settled, covering virtually every surface with fine, penetrating dust. The dust permeated the insides of buildings, and contaminated air conditioning systems, necessitating lengthy decontamination procedures.
The dust was present everywhere around Ground Zero, but settled in thicker accumulations in the downwind directions south and east of the complex. The dust settled to a depth of 3 inches in locations as far as six blocks from the World Trade Center. 1
Apparently the dust contained a significant proportion of the towers' constituents, such as their concrete, glass, and gypsum. Photographs of Ground Zero show piles of shattered steel and aluminum cladding, but show virtually no signs of the tens of thousands of tons of concrete that constituted the 4-inch-thick floor slabs of each of the towers' 110 floors. This observation, combined with the documented extent of the dust, suggests that the vast majority of that concrete was pulverized into fine dust.

source: www.911research.com

"The average size of the dust was 70 microns". GREG JENKINS.

This independent report provides
an interesting perspective on the official report, which Dr Jenkins evidently has total confidence in.

Trade Center air laden with ?very fine particles, DELTA scientists find

The UC Davis DELTA Group took air samples about a mile from the World Trade Center in early October 2001, several weeks after the towers collapsed. They identified high levels of coarse particles, above, which included powdered concrete and glass with a coating of combustion products, in size range of 5 to 12 micrometers diameter. Very fine particles were found at levels not previously seen in ambient air samples. By Michael Dunlop and Aaron Broumas.

In the most thorough analysis yet of the dust and smoke blown through lower Manhattan after the collapse of the World Trade Center, UC Davis scientists identified unprecedented clouds of very fine particles, which can be riskier to human health than larger, coarse particles.? "The air from Ground Zero was laden with extremely high amounts of very small particles, probably associated with high temperatures in the underground debris pile," says Thomas Cahill, UC Davis professor emeritus of physics and atmospheric sciences. "Normally, in New York City and in most of the world, situations like this just don't exist."?Cahill heads the UC Davis DELTA Group (Detection and Evaluation of Long-range Transport of Aerosols), a collaborative association of aerosol scientists at several universities and national laboratories, which monitors atmospheric conditions associated with global warming, weather, disasters and other events.? The DELTA Group collected air samples at therequest of the U.S. Department of Energy from Oct. 2 through mid-December, with a rooftop air monitor about 1 mile north-northeast of Ground Zero.? The results for October were released in early February, and Cahill testified at an investigative hearing before the national ombuds-person for the U.S. Environmental Protection Agency on Feb. 23.? The samples were collected continuously in eight separate-size modes from coarse (12 micrometers diameter) to ultra-fine (0.09 micrometers diameter), and were analyzed for dozens of substances that are likely to be associated with burning office buildings.?Coarse particles are typically filtered by the nose or coughed out of the throat and upper lungs, but they can irritate the mucous membranes and aggravate pre-existing breathing problems such as asthma. Very fine particles, however, can travel deep into human lungs, and are typically removed from the lungs through the bloodstream and heart, increasing the possibility of more serious health impacts.? In the largest spike, the DELTA Group analysis found 58 micrograms per cubic meter of very fine particles in one 45-minute period "an extremely high peak," Cahill says. "Even on the worst air days in Beijing, downwind from coal-fired power plants, or in the Kuwaiti oil fires, we did not see these levels of very fine particulates."? Virtually all the air samples from the trade center site also carried high concentrations of coarse particles. "These particles simply should not be there," Cahill says. "It had rained, sometimes heavily, on 6 days in the prior 3 weeks. That rain should have settled these coarse particles." The finding suggests that coarse particles were being continually generated from the hot debris pile.? Some metals in the very fine mode, such as vanadium, were found at the highest levels ever recorded in air in the United States. Although some asbestos was used in the buildings for fireproofing and in floor tiles, the DELTA group found very few asbestos fibers, even in the very fine particles.? All evidence indicates that ambient air in New York City is no longer influenced by the World Trade Center collapse, especially since the fires are out and the debris pile has cooled, Cahill says. However, the presence of large amounts of very fine particles as late as October means that the cleanup of indoor air should be undertaken carefully, he warns. Very fine particles penetrate crevices and fabrics in a way that normal dust doesn't, and they are easily resuspended, which can re-expose the room's occupants.? For more information, go to: http://delta.ucdavis.edu

Another analysis of the dust

A consequence of the pulverization of buildings and the fires was the development of a large plume of dust and smoke that released both particles and gases into the atmosphere. The initial plume impacted all directions immediately adjacent to the WTC site, and the dust and smoke settled at many outdoor and indoor locations. From the first hours to 18 hr after the collapse, the winds transported the plume to the east (Figure 1) and then to the southeast across and beyond Brooklyn, New York.

The primary differences would be the simultaneous occurrence of each type of event, the intense fire (> 1,000°C), the extremely large mass of material (> 10 x 10? tons) reduced to dust and smoke, and the previously unseen degree of pulverization of the building materials.






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