1. Human Health Risk Assessment: World Trade Centre Disaster Clinton S Young Itza Mendoza Sanchez Vaishali Kushwaha

2. World Trade Centre: Introduction Seeds of WTC planted after World War II in 1940’s, Dedicated in 1973 City chose to build the WTC instead of building a new tunnel and large bridge over the Hudson River 16 acre site in Lower Manhattan 7 buildings including two 110 storey towers, 8 years of construction

3. World Trade Centre: Facts To create the 16-acre WTC site, 5 streets were closed off and 164 buildings were demolished 1.2 million cubic yards of earth was excavated, which was used to create 23.5 acres of Liberty Park along the Hudson River More than 200,000 tons (68 miles) of steel, which can make three more Brooklyn Bridges 425,000 cubic yards of concrete, enough to build a 5 foot wide sidewalk from New York City to Washington, D.C. Combined weight of 2 towers was more than 1.5 million tons 43,600 windows with over 600,000 square feet of glass window area. more than 16 miles of staircases. 60,000 tons of cooling capacity, 49,000 tons of air-conditioning equipment, 239 elevators and 71 escalators 23,000 fluorescent light bulbs, 12,000 miles of electrical cable, 75,000 telephones maintained by 19,600 miles of cable, 300 computer mainframes More than 250,000 cans of paint were needed every year for upkeep of the Towers More than 50,000 people worked in the twin towers and More than 200,000 people - half of them tourists - moved through the buildings each day $110.3 million in gold and 120.7 million in silver were buried in the rubble It is the first skyscraper in the world destroyed by terrorists

4. World Trade Centre: Disaster September 11, 2001, morning 8.45 hijacked 767 commercial jet airplane hit north tower. 18 minutes later, 9.03am another plane hit south tower S-tower suffered complete structural collapse 1 st and then N- tower collapsed 47 storey office got damaged, caught fire and later on collapsed totally All the seven buildings of WTC collapsed and nearby buildings got significantly damaged About 2800 people died The fires were fed by more than 91,000 L of jet fuel and went on for days Airborne dust from the collapse and fumes from burning of the towers blanketed Lower Manhattan with dust containing a complex mixture of PM, asbestos, various metals, dioxins, benzene, glass fiber, PCBs, PAHs, and VOCs

5. World Trade Centre Disaster: Risk Assessment The primary goal of this study is to evaluate the potential risk to health of people working or living in the vicinity of the WTC, immediately after the WTC collapse. The methodology used for the risk assessment Hazard Identification and Data evaluation Exposure Assessment Toxicity Assessment Risk Characterization

6. World Trade Centre Disaster: Data Collection Air quality in and around New York has been monitored by: Environmental Protection Agency New York State Department of Environmental Conservation New York City Department of Environmental Protection New Jersey Department of Environmental Protection Occupational Safety and Health Administration EPA data has been used for the Analysis samples of air, dust, water, river sediments and drinking water were tested for the presence of pollutants Data collection from more than 20 fixed air monitors in and around ground zero, regional monitors in the Bronx, Brooklyn, Queens and Staten Island, and more than 20 fixed air monitors at the Staten Island Landfill (where debris from the search and recovery and excavation operations is shifted) Data was collected and evaluated for 7 contaminants/contaminant classes: Particulate matter (PM) Metals (lead, chromium, and nickel) Polychlorinated biphenyls (PCBs) Dioxins volatile organic compounds (VOCs; benzene and several others) Poly Aromatic Hydrocarbons (PAHs) Asbestos

7. World Trade Centre Disaster: Data Sampling Asbestos in Air Standard under AHERA, the Asbestos Hazard Emergency Response Act Asbestos in Bulk Dust The 1% definition Particulate Matter in Air Two methods for measuring particulate matter: The filter method, The continuous method Drinking Water Sampled drinking water from 13 water mains, evaluated the samples against federal Maximum Contaminant Levels (MCLs), no contaminants were detected Benzene/ VOCs in Air all measurements were "grab" samples, lasting a few minutes Metals in Air analyzed 20 metals, about a third of these metals: not detected and thirteen metals: detected

8. World Trade Centre Disaster: Data Evaluation very limited data available on the levels of exposure that occurred to individuals due to direct contact with the plume of smoke and dust generated by the WTC collapse on September 11 earliest reported data are from asbestos monitoring, which began on September 14 data available is space variable as well as time variable the maximum concentration for all the contaminants available has been chosen in order to calculate risk comparing a single concentration with the available screening values (which are for average concentrations and for continuous exposure) makes almost all the contaminants Chemical of Concerns (COC’s).

9. Toxicity Assessment

10. Toxicity assessment

11. Exposure assessment To evaluate the exposure pathways it is necessary to define: a) Source of contamination b) Media contaminated c) Type of contaminant d) Route of human exposure.

12. Exposure assessment Source of contamination On-site Off-site

13. Exposure assessment Media contaminated –air Type of contaminants –Asbestos, benzene, dioxin, metals, PM, PCBs, VOCs Route of human exposure –inhalation

14. Exposure assessment Exposure scenarios

15. Exposure assessment Ind. cancer Ind. n-canc Rec cancer Rec n-canc Res cancer Res n-canc Exp. freq 15 days/year 1 days/year 15 days/year Exp time 8 hour/day 3 hour/day 6 hour/day Ave. time 365 days 15 days 365 days 1 days 365 days 15 days Parameter values

16. WTC Building Exposures Four Buildings –North –South –Austin –Building 5 Carcinogen vs. Non-carcinogen Adults Only Occupational Exposures

17. WTC North CarcinogensNon-carcinogens

18. WTC South CarcinogensNon-carcinogens

19. WTC Austin CarcinogensNon-carcinogens

20. WTC Building 5 CarcinogensNon-carcinogens

21. Average Exposures Larger sampling area Children and Adults Different exposures –Industrial –Recreational –Residential

22. Adult Industrial Exposure CarcinogensNon-carcinogens

23. Adult Recreational Exposure CarcinogensNon-carcinogens

24. Child Recreational Exposure CarcinogensNon-carcinogens

25. Adult Residential Exposure CarcinogensNon-carcinogens

26. Child Residential Exposure CarcinogensNon-carcinogens

27. Summary Carcinogens –Benzene –chloroform –dichloroethane –vinyl chloride –Dioxane –Bromoform –carbon tetrachloride – hexachlorobutadiene Non-carcinogens –Butadiene –vinyl acetate – bromoethane – chromium – chlorobenzene – benzene –MTBE