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World Trade Center Environmental
Contaminant Database (WTCECD)
The purpose of the World Trade Center
Environmental Contaminant Database (WTCECD) is to provide pre- and post-9/11
environmental data from the New York City area and the state of New Jersey in
an easily accessible format.
This database is intended for use by
individuals interested in having access to raw data in order to explore
exposures related to the WTC disaster or general air quality issues in NYC and
New Jersey. We hope that researchers, educators, as well as interested
individuals will find the site helpful.
The WTCECD currently provides:
data collected on samples of outdoor air, outdoor bulk dust, indoor air, and
indoor dust wipes specifically in response to the disaster by the USEPA and
NYSDEC; approximately 200 parameters are present, including particulate matter
mass (PM2.5, PM10), volatile organic compounds (VOCs), dioxins, polychlorinated
biphenyls (PCBs), metals, and asbestos.
air quality data reported to EPA’s Aerometric Information Retrieval System
(AIRS) data repository from fixed-site air quality monitoring stations run by
local, state and federal environmental agencies from 1970 to December 31,
2004. These include ozone, sulfur dioxide, nitrogen dioxide, carbon monoxide,
lead, particulate matter mass (TSP, PM10, PM2.5) plus parameters measured on an
irregular basis which include a suite of volatile organic compounds (VOCs),
dioxins, polychlorinated biphenyls (PCBs), particle-associated metals, and
limited meteorological data.
In the future, the WTCECD will provide
links to other (offsite) datasets relevant to WTC exposures, as well as
incorporating other datasets provided by researchers at NIEHS centers.
The web-based interface allows searching
the WTCECD for one or more contaminant parameters from one or more specific
sites. Query results are provided for download as comma or tab-delimited text
files. A typical WTCECD query automatically provides sampling location,
sampling date and other fields helpful for data interpretation (e.g. agency
provided data quality flags). Additional fields are available and may be
selected. Query results may be date-limited prior to download, as well.
Supplemental documentation (maps, data
dictionaires, QA/QC flag definitions) is available from links on the left-hand
side of each webpage. Online help is available at each step in the query.
This database was developed with funding
from the National Institute of Environmental Health Sciences via their Centers
for Environmental Health at the
Mailman School of Public Health at Columbia University
Bloomberg School of Public Health at John Hopkins, with support
from grants P30 ES09089 and P30 ES03819. The site programmers are in the
Statistical Analysis Center in the Department of Biostatistics at Columbia
University. Furthermore, this database would not have been possible without all
the help we received from numerous staff at USEPA and NYSDEC, which we
The purpose of the WTCECD is to provide data, as described above, in an easily
accessible format. Data analysis and interpretations are not provided on the
web site nor will WTCECD staff provide recommendations for data analysis.
Data included in the WTCECD have been provided by state and federal agencies.
These data have been incorporated as delivered; no additional quality assurance
has been conducted by the WTCECD staff. As such, the WTCECD staff can provide
NO additional assurance regarding the veracity of the data. Users with
questions about data sets must direct their questions to the original data
Data included in the WTCECD collected in specific response to the events of
September 11, 2001, have undergone quality assurance by the originating
agencies. The WTCECD staff has been advised that this is an on-going process
and further changes to this data set may occur in the future. If changes are
made, the WTCECD will be updated upon delivery of the revised data set. Any
changes to the WTCECD will be posted to the "Recent Changes" section of the