Epidemiological evidence from studies conducted in the 1990's has renewed concerns about the health effects of ambient particles. In 1997, the U.S. Environmental Protection Agency decided to retain the current PM10 standards and add both a daily and annual standard for PM2.5 to provide increased public health protection. Even as the new standards were promulgated, many questions remained and it was recognized that further research on the health effects of particulate matter was needed to resolve key outstanding issues. In 1998 the European Union adopted limit values for PM10 and called for new research on fine particles to determine whether this fraction should also be regulated. This website is being developed to assist in the broad effort on particulate matter research, and to support the activities of the National Research Council Committee on Research Priorities for Airborne Particulate Matter.
Recent Submissions FAQ Search Research Projects Organized By : Principal Investigator Research Organization NRC Priority Number Sponsoring Organization Project Title Links Discussion Forum NRC Priorities Submissions Feedback	This database is a compilation of Particulate Matter research projects. The database provides the following data for each research project: project title principal investigator(s) research organization city and state sponsoring organization and contact person NRC priority number(s) research category study locations keywords abstract
This website is operated and maintained by the Health Effects Institute (HEI) in collaboration with the U.S. Environmental Protection Agency (EPA). It was last updated on 02/24/2003

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