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U.S. EPA Human Exposure and Atmospheric Sciences Division
P.O. Box 93478
NHEXAS is a rich source of data that EPA encourages you to use for research and analysis. Users must be familiar with data file manipulation and analysis. EPA cannot analyze, check results, debug programs, or review literature for your work. Thoroughly reviewing the documentation on the survey's planning, analytic guidelines, and datasets available through HEDS and EIMS should resolve most questions. If you have questions after reviewing the documentation, please contact the Human Exposure and Atmospheric Sciences Division at 919-541-3184 or email "admin.heds@epa.gov". Please review the data use restrictions in the Notice field and your agreement to comply with these restrictions in using the data.
These data are the result of a probability-based sampling design specific to the population under study. Thus the data may or may not be representative of subsets of this study's population or of other populations. The study was designed to test certain hypotheses, which may limit its applicability for other purposes. When using these data it is important to consider the percentage of non-responses or non-detects and concentrations less than the detection limit as indicators of its usefulness for other purposes. The U.S. EPA accepts no liability for any errors or omissions in the results included in the data sets, associated information, and/or documentation.
Based on the output format selected by the user and the software into which the data set is imported, measurements and sampling weights may be zero-padded to the right of non-zero decimal digits. These zeroes are a function of the formatting process and the software's acceptance of that format and should not be construed as significant digits in the value. Measurement values are provided with four significant digits; sampling weights are provided with three decimal digits.
Records for samples or questionnaires not meeting chain of custody or QA requirements have not been included in this data set.