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CHAD Explorer - An Enhanced Web Application for CHAD
Citation:
Liu, S. AND T. Mccurdy. CHAD Explorer - An Enhanced Web Application for CHAD. ELECTRONIC INTERNATIONAL JOURNAL OF TIME USE RESEARCH . Leuphana University of Lueneburg, Luneburg, Germany, 9(1):144-159, (2012).
Impact/Purpose:
The National Exposure Research Laboratory′s (NERL′s) Human Exposure and Atmospheric Sciences Division (HEASD) conducts research in support of EPA′s mission to protect human health and the environment. HEASD′s research program supports Goal 1 (Clean Air) and Goal 4 (Healthy People) of EPA′s strategic plan. More specifically, our division conducts research to characterize the movement of pollutants from the source to contact with humans. Our multidisciplinary research program produces Methods, Measurements, and Models to identify relationships between and characterize processes that link source emissions, environmental concentrations, human exposures, and target-tissue dose. The impact of these tools is improved regulatory programs and policies for EPA.
Description:
In 1999 the US Environmental Protection Agency (EPA) developed a Consolidated Human Activity Database (CHAD). CHAD has been used for various exposure modeling studies (McCurdy et al., 2000, Graham & McCurdy, 2004; McCurdy & Graham, 2003). Recently, CHAD has been improved and enhanced with a new web application called CHAD Explorer (CHAD-Ex). CHAD Explorer (CHAD-Ex) consists of 24 h diaries for almost 35,000 U.S. citizens. These diaries are associated with location and activity codes (Robinson et al., 1989, (McCurdy & Graham, 2003). The studies included in CHAD-Ex are listed in Table 1. The diaries come from national and state-level random probability studies. The data were acquired between 1983 and 2008. About half of information is cross-sectional in nature, having one diary day of time use information per person, while the other half has between 2-369 days of data per person. CHAD and CHAD-Ex both can be found at the same web site (www.epa.gov/chadnet1) Specifics about CHAD Explorer (CHAD-Ex) CHAD-Ex takes advantage of the Oracle Application Express™ (OAE) as an integrated development environment for developing a database-driven web application which provides various ways for browsing and querying the sequential 24-h U.S. time use data contained in CHAD.
URLs/Downloads:
CHAD Explorer - An Enhanced Web Application for CHAD (PDF, NA pp, 672 KB, about PDF)Electronic International Journal of Time Use Research
