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Context of '11:01 a.m.-12:10 p.m., September 11, 2001: Five Shocks Occur at Ground Zero, according to Seismological Data'

This is a scalable context timeline. It contains events related to the event 11:01 a.m.-12:10 p.m., September 11, 2001: Five Shocks Occur at Ground Zero, according to Seismological Data. You can narrow or broaden the context of this timeline by adjusting the zoom level. The lower the scale, the more relevant the items on average will be, while the higher the scale, the less relevant the items, on average, will be.

India, which has refused to sign the Comprehensive Test Ban Treaty (CTBT) banning nuclear testing (see September 10, 1996), shocks the world by testing five nuclear devices over the course of three days. The largest is a 42-kiloton thermonuclear device. [Federation of American Scientists, 12/18/2007] India’s rival Pakistan will conduct its own nuclear tests two weeks later (see May 28, 1998). Indian political scientist and nuclear critic Kanti Bajpai will later say: “Whatever Indians say officially, there is a status attached to the bomb. The five permanent members of the UN Security Council are all nuclear powers.” [New York Times, 5/4/2003]

Entity Tags: Kanti Bajpai

Timeline Tags: US International Relations

The strike on the Pentagon does not generate a clear seismic signal. A study by the Maryland Geological Survey will state, “We analyzed seismic records from five stations in the northeastern United States, ranging from 63 to 350 km from the Pentagon. Despite detailed analysis of the data, we could not find a clear seismic signal. Even the closest station… did not record the impact. We concluded that the plane impact to the Pentagon generated relatively weak seismic signals.” The study, which is conducted at the request of the Army, states that there are seismic signals for the two planes impacting the World Trade Center and for the Flight 93 crash in Pennsylvania, which allow times to be determined for these events. [Kim and Baum, 2002 pdf file]

Timeline Tags: Complete 911 Timeline, 9/11 Timeline

The seismic record at Palisades, NY, 34 km north of the World Trade Center.The seismic record at Palisades, NY, 34 km north of the World Trade Center. [Source: Lamont-Doherty Earth Observatory] (click image to enlarge)According to a seismographical study conducted by Columbia University’s Lamont-Doherty Earth Observatory in Palisades, New York, five distinct shocks occur at the World Trade Center site. They occur at 11:01 a.m., 11:15 a.m., 11:29 a.m., 12:07 p.m., and 12:10 p.m. According to the study, the five resulting seismic signals “may have been generated by additional collapses.” [Earth Institute at Columbia University, 11/16/2001; Kim et al., 11/20/2001 pdf file]

Entity Tags: Lamont-Doherty Earth Observatory

Timeline Tags: Complete 911 Timeline

Steven Stefanakos.Steven Stefanakos. [Source: New York City Police Department.]Recovery workers at Ground Zero search for one of the black boxes from Flight 11 or Flight 175—the planes that crashed into the World Trade Center on 9/11—in locations where a signal from the device has reportedly been picked up, but it is unclear if they find a black box. [Appel, 2009, pp. 281-282] The two “black boxes” carried by all commercial aircraft—the cockpit voice recorder and the flight data recorder—can provide valuable information about why a plane crashed. [CBS News, 2/25/2002; PBS, 2/17/2004] In the week after the 9/11 attacks occur, investigators identify a signal being emitted by one of the black boxes in the WTC debris, according to a report published by the New York State Emergency Management Office (see September 18, 2001). [New York State Emergency Management Office, 9/18/2001, pp. 1 pdf file] The signal is detected by the Federal Aviation Administration (FAA), according to author Anthea Appel. However, while FAA personnel are able to hear the signal, they are unable to pinpoint exactly where it is coming from.
FAA Suggests Two Possible Locations for the Black Box - The FAA initially says it thinks the signal is coming from the corner of Liberty and Church Streets, which border the south and east edges of the WTC site, respectively, and so recovery workers are sent to dig at this location. However, after a few days, it changes its mind and, on September 21, says the signal is coming from Building 5 of the WTC. [Appel, 2009, pp. 281] This nine-story building is located in the northeast corner of the WTC site. [Federal Emergency Management Agency, 5/1/2002, pp. 4-1] The signal is coming from inside or directly under its roof, the FAA says.
Police Officers See No Sign of the Black Box - Lieutenant Delia Mannix of the New York Police Department’s Emergency Service Unit (ESU), who is in charge of the operation to recover the black box, decides the only way to search the roof of Building 5 is to send a team up in a small, waist-high cage known as a “bucket.” Steven Stefanakos and two other ESU officers, who are selected for the task, get into a bucket and a crane lifts them onto the roof of Building 5. Knowing the black box is supposed to be under or embedded in the roof, Stefanakos and the two other officers look around, trying to spot a hole or a dent where the black box could have punctured the roof after being catapulted out of the plane when it crashed into the WTC. The roof, however, appears to be intact.
FAA Staffer Responsible for Locating the Black Box Has Gone Home - Unsure where to search, Stefanakos tries contacting the FAA staffer who is responsible for locating the black box. He tries to reach them three times over his radio but gets no response. Finally, a voice comes over his radio, telling him: “The FAA aren’t here. They went home for the weekend.” Noting that it is only about five o’clock in the afternoon, Stefanakos and his two colleagues are incredulous. As they are being carried down to the ground in the bucket, they comment to each other: “We’ve been workin’ every day for 16 or 17 hours straight with no days off. And here we are, inches away from the black box, and the FAA just get up and leave in the middle of a recovery just because they don’t wanna screw up their weekend!” [Appel, 2009, pp. 281-282] Whether a black box is subsequently retrieved from the roof of Building 5 is unstated. The 9/11 Commission Report will state that the black boxes from the planes that crashed into the WTC “were not found.” [9/11 Commission, 7/24/2004, pp. 456] Furthermore, a report published by the New York City Office of Emergency Management on September 25 will claim that the FAA has in fact been “[u]nable to detect any ‘pinging’ from either ‘black box’” at Ground Zero. [New York City Office of Emergency Management, 9/25/2001, pp. 17-18 pdf file] However, firefighter Nicholas DeMasi, who works extensively in the wreckage of the WTC, will say he helped federal agents recover three black boxes at Ground Zero (see October 2001). [Swanson, 2003, pp. 108; Philadelphia Daily News, 10/28/2004]

Entity Tags: Federal Aviation Administration, New York City Police Department, Delia Mannix, Steven Stefanakos

Timeline Tags: Complete 911 Timeline, 9/11 Timeline

Lidar map of Ground Zero.Lidar map of Ground Zero. [Source: EarthData/Library of Congress]EarthData, a geospatial imaging company, is tasked by New York authorities with producing maps of Ground Zero using “light detection and ranging” or “lidar” technology. Lidar is similar to radar but uses a laser light instead of radio waves to measure elevation. This information is then merged with GPS data to produce a color-coded map. EarthData will make daily flights over the area for several months starting mid-September to provide rescuers and removal workers with up-to-date representations of Ground Zero. [New York Times, 9/23/2001; New York Times, 10/2/2001] The Library of Congress will later present some of the maps in an online exhibit which also includes aerial photography and video fly-through simulations of the World Trade Center, both before and after the attacks. [www.loc.gov, 2004]

Entity Tags: EarthData International, Inc.

Timeline Tags: Complete 911 Timeline

Thermal hot spots detected by satellite on September 16, 2001. Red and orange indicate the hottest locations. The World Trade Center Twin Towers footprint is in the lower center and the center of World Trade Center Building 7 is in the upper right.
Thermal hot spots detected by satellite on September 16, 2001. Red and orange indicate the hottest locations. The World Trade Center Twin Towers footprint is in the lower center and the center of World Trade Center Building 7 is in the upper right. [Source: USGS]In response to requests from the Environmental Protection Agency, through the US Geological Survey, NASA flies a plane over the site of the WTC complex, equipped with a remote sensing instrument called AVIRIS. AVIRIS is able to remotely record the near-infrared signature of heat. Analysis of the data it collects indicates temperatures at Ground Zero of above 800 degrees Fahrenheit, with some areas above 1,300 degrees. On September 16, dozens of “hot spots” are seen, but by September 23, only four or five remain. [US Geological Survey, 11/27/2001; US Geological Survey, 10/2002 pdf file] Robert Shaler, the scientist who leads the forensic examination by the New York City medical examiner’s office to identify 9/11 victims, later will state that the “DNA in the bodies” of WTC victims “was in pretty bad shape. These bones were exposed to extreme temperatures.” [US News and World Report, 12/5/2005] Don Carson, a hazardous materials expert, later will say, “There are pieces of steel being pulled out [of the WTC rubble] that are still cherry red. It’s like the charcoal that you put in your grill.… You light it and it stays hot.” [New York Daily News, 11/1/2001] And Dr. Jonathan Barnett, a member of FEMA’s WTC investigation team, will describe steel members in the debris pile that appear to have been partly evaporated in extremely high temperatures. [New York Times, 11/29/2001] Despite the WTC rubble being pumped with an almost constant jet of water, eventually totaling thousands of gallons, almost 12 weeks after 9/11 at least one fire is still burning, making it the longest-burning structural fire in history. [New Scientist, 12/3/2001; CBS News, 12/19/2001] As well as the hot spots, numerous witnesses describe molten metal being found at Ground Zero (see September 12, 2001-February 2002).

Entity Tags: Robert Shaler, Jonathan Barnett, National Aeronautics and Space Administration, Don Carson

Timeline Tags: Complete 911 Timeline, 9/11 Timeline

Logo of the New York State Emergency Management Office.Logo of the New York State Emergency Management Office. [Source: New York State Emergency Management Office]Investigators searching the debris of the collapsed World Trade Center towers are reported to have detected a signal from one of the black boxes from the planes that crashed into the WTC on September 11, although government officials will later say that these two planes’ black boxes were never found. [New York State Emergency Management Office, 9/18/2001 pdf file; Philadelphia Daily News, 10/28/2004] The two “black boxes” carried by all commercial aircraft—the cockpit voice recorder and the flight data recorder—can provide valuable information about why a plane crashed. [CBS News, 2/25/2002; PBS, 2/17/2004] A report published today by the New York State Emergency Management Office states that “[i]nvestigators have identified the signal from one of the black boxes in the WTC debris.” [New York State Emergency Management Office, 9/18/2001 pdf file] Furthermore, a team from the Army’s Communications-Electronics Command (CECOM) arrived at Ground Zero on September 13 “and scoped the area using classified signal equipment,” according to Federal Computer Week magazine, and according to Toni Quiroz, chief of the computer networking branch at CECOM, “The team managed to get some signals that could have emanated from the black boxes.” Quiroz will add, however, that “it was never determined if they were the recorders.” [Federal Computer Week, 9/16/2002] But a report published by the New York City Office of Emergency Management on September 25 will state that the Federal Aviation Administration (FAA) has been “[u]nable to detect any ‘pinging’ from either ‘black box’” at Ground Zero. [New York City Office of Emergency Management, 9/25/2001 pdf file] A firefighter and a volunteer who are involved in the recovery effort at Ground Zero will say they helped federal agents find three of the four black boxes in the WTC debris (see October 2001). [Swanson, 2003, pp. 108; Philadelphia Daily News, 10/28/2004] But the 9/11 Commission Report will state that the black boxes from the planes that crashed into the WTC “were not found” and the FBI will, in 2004, make the same claim. [9/11 Commission, 7/24/2004, pp. 456; Philadelphia Daily News, 10/28/2004]

Entity Tags: Toni Quiroz, Federal Aviation Administration, Army’s Communications-Electronics Command

Timeline Tags: Complete 911 Timeline, 9/11 Timeline

Dr. Abolhassan Astaneh-Asl examines steel from the World Trade Center.Dr. Abolhassan Astaneh-Asl examines steel from the World Trade Center. [Source: University of California, Berkeley]An engineer investigating the remains of the World Trade Center sees melted girders and other evidence that the towers experienced extreme temperatures on 9/11. Dr. Abolhassan Astaneh-Asl is a professor of civil and environmental engineering at the University of California, Berkeley. He specializes in studying structural damage done by earthquakes and terrorist bombings. [Chronicle of Higher Education, 12/7/2001; CBS News, 3/11/2002] He arrives in New York on September 19 to conduct a two-week scientific reconnaissance of the collapsed towers, hoping to gain an understanding of how they had come down. His project is one of eight financed by the National Science Foundation to study the WTC disaster. [New York Times, 10/2/2001; Berkeleyan, 10/3/2001; US Congress. House. Committee on Science, 3/6/2002] He examines numerous pieces of steel taken from Ground Zero. [Chronicle of Higher Education, 12/7/2001] Astaneh-Asl will describe the WTC as “the best-designed building I have ever seen.” [San Francisco Chronicle, 10/22/2001] Yet he notices unusual warping and other damage in its remaining steel:
bullet At a recycling center in New Jersey, he sees 10-ton steel beams from the towers that look “like giant sticks of twisted licorice.” [Chronicle of Higher Education, 12/7/2001] He shows the San Francisco Chronicle a “banana-shaped, rust-colored piece of steel” that has “twisted like toffee during the terrorist attack.” [San Francisco Chronicle, 10/22/2001]
bullet He later recalls, “I saw melting of girders in [the] World Trade Center.” [PBS, 5/10/2007]
bullet He notes that steel has bent at several connection points that had joined the floors of the WTC to the vertical columns. He describes the connections as being smoothly warped, saying, “If you remember the Salvador Dali paintings with the clocks that are kind of melted—it’s kind of like that.” He adds, “That could only happen if you get steel yellow hot or white hot—perhaps around 2,000 degrees.” [Chronicle of Higher Education, 12/7/2001]
bullet Astaneh-Asl says that steel flanges have been reduced “from an inch thick to paper thin.” [Berkeleyan, 10/3/2001]
bullet He finds a foot-long twisted shard of steel that is “like a piece of bread, but it was high-strength steel.” He comments, “I haven’t seen anything like this [before].” [Berkeley Daily Planet, 10/20/2001]
bullet He finds “severely scorched [steel] members from 40 or so floors below the points of impact [by the planes].” He believes this is the result of the planes having destroyed the elevator walls, thereby allowing burning jet fuel to pour down into the building, igniting fires hundreds of feet below the impact floors. [CBS News, 3/12/2002]
bullet He says that, in some places, the fireproofing used to protect the WTC steel has “melted into a glassy residue.” [New York Times, 10/2/2001]
bullet Astaneh-Asl sees a charred I-beam from WTC Building 7, which collapsed late in the afternoon of 9/11. “The beam, so named because its cross-section looks like a capital I, had clearly endured searing temperatures. Parts of the flat top of the I, once five-eighths of an inch thick, had vaporized.” [New York Times, 10/2/2001]
Other individuals will report seeing molten metal in the remains of the World Trade Center in the weeks and months after 9/11 (see September 12, 2001-February 2002), and data collected by NASA reveals dozens of “hot spots” (some over 1,300 degrees Fahrenheit) at Ground Zero (see September 16-23, 2001). But Thomas Eagar—an engineering professor at the Massachusetts Institute of Technology—later comments that the “temperature of the fire at the WTC [on 9/11] was not unusual, and it was most definitely not capable of melting steel.” [Eagar and Musso, 12/2001] Yet Astaneh-Asl will later put forward the “tentative” conclusion, “The collapse of the [Twin Towers] was most likely due to the intense fire initiated by the jet fuel of the planes and continued due to burning of the building contents.” [Astaneh-Asl, 11/30/2003 pdf file] Astaneh-Asl is a member of the team assembled by the American Society of Civil Engineers to investigate the World Trade Center site after 9/11 (see September 12, 2001), though he will resign from this because he disagrees with its decision to keep findings secret until the initial inquiry has been completed. [New York Times, 10/2/2001; Associated Press, 9/6/2002]

Entity Tags: World Trade Center, Thomas Eagar, Abolhassan Astaneh-Asl

Timeline Tags: Complete 911 Timeline, 9/11 Timeline

A poster to help law enforcement officers locate the missing ‘black boxes’ in the WTC debris.A poster to help law enforcement officers locate the missing ‘black boxes’ in the WTC debris. [Source: FBI / Smithsonian Institution]Three of the four black boxes from Flight 11 and Flight 175 are found this month, according to two men who work extensively in the wreckage of the World Trade Center, but the public is not told. New York City firefighter Nicholas DeMasi will mention the discovery of the black boxes in a book published in 2003. He will claim to have driven federal agents on an all-terrain vehicle during their search and state that they found three of the four missing black boxes. The Philadelphia Daily News will report on the story in 2004 when another recovery worker, volunteer Mike Bellone, backs up DeMasi’s account and claims to have seen one of the black boxes. Spokesmen for the FBI and the New York City Fire Department will deny the claims of these two workers. [Swanson, 2003, pp. 108; Philadelphia Daily News, 10/28/2004] But in 2005, CounterPunch will report: “A source at the National Transportation Safety Board, the agency that has the task of deciphering the data from the black boxes retrieved from crash sites—including those that are being handled as crimes and fall under the jurisdiction of the FBI—says the boxes were in fact recovered and were analyzed by the NTSB. ‘Off the record, we had the boxes,’ the source says. ‘You’d have to get the official word from the FBI as to where they are, but we worked on them here.’” An NTSB spokesperson will deny that the FBI ever gave the NTSB the black boxes. [CounterPunch, 12/19/2005] On September 18, it was reported that investigators had detected a signal from one of the black boxes in the debris at Ground Zero (see September 18, 2001). [New York State Emergency Management Office, 9/18/2001 pdf file] But the 9/11 Commission Report will state that the black boxes from Flight 11 and Flight 175 “were not found.” [9/11 Commission, 7/24/2004, pp. 456]

Entity Tags: Federal Bureau of Investigation, Mike Bellone, New York City Fire Department, Nicholas DeMasi, RobertMoomo

Timeline Tags: Complete 911 Timeline, 9/11 Timeline

A draft report written by Dr. Roderick Wallace of New York State Psychiatric Institute and Dr. Deborah N. Wallace of Columbia University, warns that residents of downtown Manhattan may later develop symptoms similar to “particularly acute forms of Gulf War Syndrome” because of their exposure to the contaminants released when the World Trade Center towers collapsed and burned. The report’s authors write that the collapse and fires appear “to have exposed an exceedingly large population to dioxins, dibenzofurans, related endocrine disruptors, and a multitude of other physiologically active chemicals arising from the decomposition of the massive quantities of halogenated hydrocarbons and other plastics within the affected buildings.” The expected pattern “greatly transcends a simple ‘Post Traumatic Stress Disorder’ model, and may come to resemble particularly acute forms of Gulf War Syndrome,” they say. [Wallace and Wallace, 10/8/2001 pdf file]

Entity Tags: Deborah N Wallace, Rodrick Wallace

Timeline Tags: Environmental Impact of 9/11

Pier 25 on the Hudson River.Pier 25 on the Hudson River. [Source: Larry Lerner / FEMA]Recovery workers find what appears to be one of the black boxes from Flight 11 or Flight 175—the planes that crashed into the World Trade Center on 9/11—while they are working near Ground Zero, but FBI agents who inspect the object deny that it is one of these devices. [Keegan and Davis, 2006, pp. 94-96] The two black boxes carried by all commercial aircraft—the cockpit voice recorder and the flight data recorder—can provide valuable information about why a plane crashed. Although they are called “black” boxes, they are in fact painted bright orange. [CBS News, 2/25/2002; PBS, 2/17/2004] Since the initial days of the recovery effort at Ground Zero, finding the black boxes from Flight 11 and Flight 175 has been a priority, due to the critical information they might hold. Many posters with photos of a plane’s black boxes have been put up around the WTC site so workers will recognize these devices if they turn up in the debris.
Operating Engineer Thinks He Has Found a Black Box - Today, an operating engineer notices an object that looks like it could be one of the black boxes while he is scraping up a load of debris at Pier 25 on the Hudson River. [Keegan and Davis, 2006, pp. 94] At Pier 25, near Ground Zero, debris from the WTC site is being loaded onto barges and transported to the Fresh Kills landfill on Staten Island. [New York Daily News, 1/6/2002; APWA Reporter, 3/2004] The operating engineer thinks the object is the same shape as a black box. It is too blackened and charred, though, for him to determine if it is painted orange, like a plane’s black boxes are. He stops operations at the pier so he can get the opinion of the crane operator there. The crane operator agrees that the object looks like a plane’s black box and says its discovery should be reported. The operating engineer therefore makes a call to report the find and is put through to Lieutenant Ed Moss of the Port Authority Police Department (PAPD).
Police Officers Think the Unearthed Object Is a Black Box - After the operating engineer tells him about the discovery, Moss heads to Pier 25 with his colleague, Lieutenant Bill Doubrawski. He examines the object and he too thinks it is one of the black boxes. Excitedly, he contacts Lieutenant William Keegan, who is in charge of the PAPD’s nighttime rescue and recovery operation at Ground Zero. Talking over a secure phone line, Moss tells Keegan: “I think we found one of these things. I’m looking at the diagram. I think this is it.” Moss says Doubrawski agrees with his assessment. He describes the object as being “[h]ard as a rock, not orange,” and looking “like it was torched, all blackened.” Keegan says he wants to see the object and heads to Pier 25 to examine it.
Senior Police Officer Agrees with His Colleagues' Assessment - When he arrives there, he compares the object to some photos of a plane’s black boxes and agrees that it appears to be one of these devices. “The object found on the pier was absolutely close enough to the pictures available to us to notify the FBI without delay,” Keegan will later write. The PAPD officers arrange for some FBI agents who are working at Ground Zero to come to the PAPD command post to see the object.
FBI Agents Think the Object Is a Black Box but Then Change Their Minds - Around 20 to 30 minutes later, two FBI agents arrive at the command post. The agents examine the object that has been discovered and compare it to a diagram of a plane’s black box. They then say words to the effect of “Wow, this looks like it” and “It’s the same shape,” according to Keegan. However, after looking at the object for a few more minutes, they apparently change their minds. “We don’t think it’s a black box,” one of them tells the PAPD officers. In response, Keegan asks: “So it’s okay to throw it back on the barge? You’re clearing it?” The other agent quickly replies, “No, no, we’re going to take it with us.” The two FBI agents then leave the command post, taking the object with them. Keegan and his colleagues will subsequently never receive any information from the FBI, regarding whether the object really is one of the black boxes. [Keegan and Davis, 2006, pp. 94-96] The 9/11 Commission Report will state that the black boxes from the planes that crashed into the WTC “were not found.” [9/11 Commission, 7/24/2004, pp. 456] But firefighter Nicholas DeMasi, who works extensively in the wreckage of the WTC, will say he helped federal agents recover three black boxes at Ground Zero (see October 2001). [Swanson, 2003, pp. 108; Philadelphia Daily News, 10/28/2004]

Entity Tags: Bill Doubrawski, Federal Bureau of Investigation, Ed Moss, William Keegan

Timeline Tags: Complete 911 Timeline, 9/11 Timeline

A structural engineer who was a member of the team assembled by the American Society of Civil Engineers to investigate the World Trade Center site after 9/11 complains about the decision to rapidly destroy the remaining structural steel from the collapsed WTC buildings. Dr. Abolhassan Astaneh-Asl is a professor of civil and environmental engineering at the University of California at Berkeley, and specializes in studying structural damage done by earthquakes and terrorist bombings. [Chronicle of Higher Education, 12/7/2001; CBS News, 3/11/2002; Associated Press, 9/6/2002] He had come to New York a week after 9/11 to examine the collapsed towers, hoping to gain an understanding of how they had come down (see September 19-October 2001). [New York Times, 10/2/2001; US Congress. House. Committee on Science, 3/6/2002] However, New York City officials had decided early on to quickly transport the remaining structural steel to scrap yards, to be shipped abroad and melted down for reuse (see Shortly After September 11, 2001). As CBS News now reports, “As a result, Astaneh has almost certainly missed seeing crucial pieces before they were cut up and sent overseas.” Astaneh-Asl complains: “When there is a car accident and two people are killed, you keep the car until the trial is over. If a plane crashes, not only do you keep the plane, but you assemble all the pieces, take it to a hangar, and put it together. That’s only for 200, 300 people, when they die. In this case you had 3,000 people dead.” He says: “My wish was that we had spent whatever it takes, maybe $50 million, $100 million, and maybe two years, get all this steel, carry it to a lot. Instead of recycling it, put it horizontally, and assemble it. You have maybe 200 engineers, not just myself running around trying to figure out what’s going on. After all, this is a crime scene and you have to figure out exactly what happened for this crime, and learn from it.” However, he adds, “My wish is not what happens.” [CBS News, 3/12/2002] Astaneh-Asl previously told the New York Times that the scrap steel from the WTC was “worth only a few million dollars, a tiny fraction of the billions of dollars the cleanup will cost.” Yet the knowledge that could be gained from it “could save lives in a future disaster.” [New York Times, 10/2/2001]

Entity Tags: World Trade Center, Abolhassan Astaneh-Asl

Timeline Tags: Complete 911 Timeline, 9/11 Timeline

The EPA Office of Research and Development releases a comprehensive study on pollution in and around Ground Zero titled, “Exposure and Human Health Evaluation of Airborne Pollution from the World Trade Center Disaster.” The study concludes that the majority of residents and employees who returned to homes and offices after September 17 were “unlikely to suffer short-term or adverse health effects” from contaminants in the air. However the study warns that the thousands of people who were caught in the huge billowing dust clouds immediately after the towers collapsed, or who inhaled the air near the WTC site a few days after the attack, were “at risk for immediate acute [and possibly chronic] respiratory and other types of symptoms.” On page 77 of the report, the authors reveal that recorded dioxin levels from September through November were extremely high. For example, between October 12 and 29, a monitoring station on Park Row near City Hall Park recorded dioxin levels that averaged 5.6 parts per trillion/per cubic meter of air. This level is almost six times greater than the highest dioxin level ever recorded in the US, the report notes. The heaviest concentrations of dioxins were found at Ground Zero where concentrations “ranging from about 10 to 170” parts per trillion were recorded during the period between September 23 through November 21. Again the report observes that this figure is “between 100 and 1,500 times higher than typically found in urban air.” David Carpenter, MD, a researcher at State University of New York, tells the New York Daily News, “Those air levels are outrageous. There’s a very significant health danger here.” [New York Daily News, 12/31/2002]

Entity Tags: Environmental Protection Agency

Timeline Tags: Environmental Impact of 9/11

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