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One challenge in assessing the health effects of human exposure to air pollution in epidemiologic studies is the lack of widespread historical air pollutant monitoring data with which to characterize past exposure levels.
Pubmed ID: 20056563
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Government agency responsible for the United States Census that also gathers other national demographic and economic data. As a part of the United States Department of Commerce, it serves as a leading source of data about America''''s people and economy. Its most visible role is to perform the official decennial (every 10 years) count of people living in the U.S. The most important result is the reallocation of the number of seats each state is allowed in the House of Representatives, but the results also affect a range of government programs received by each state. The agency director is a political appointee selected by the President of the United States.
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