"January 2004." "EPA 600/R-04-001." Final; Includes bibliographical references (p. [48]). Sponsored by U.S. EPA, Office of Research and Development, Air Pollution Prevention and Control Division "Prepared for U.S. Environmental Protection Agency Region I ; prepared by National Risk Management, Research Laboratory"--Cover.

"The report discusses a new measurement technology for characterizing emissions from large area sources. The work was funded by EPA's Monitoring and Measurement for the 21st Century Initiative, or 21M2. The site selected for demonstrating this technology is a superfund landfill [in Somersworth, N.H.] that is being evaluated for recreational use. Data on methane and air toxics were needed to help determine any increased risk to those using the site. Open-path Fourier transform infrared (OP-FTIR) spectrometers were used to provide data on both background and surface emissions. The technology provides concentration maps indicating the spatial variability and areas where additional control may be needed. Horizontal scans to identify any hot spots and vertical scans using a multiple-beam configuration to determine the mass flux were conducted. Optical remote sensing-radial plume mapping provided concentration mapping of the site. These data will be used to make decisions about potential recreational use of this site."--Abstract.