Abstract: Disclosed is a method and system for monitoring fugitive emissions in a multi-source fugitive emission environment. The system includes machine readable elements (as bar code) at each fugitive emissions source. These machine readable elements are for identifying the source. The system also has a portable monitor that includes a reader, a detector, and storage. Specifically, the reader reads the machine readable element and generates a machine storable source identification signal corresponding to the element. The detector generates a second machine storable signal. This signal represents the amount or other attribute of fugitive emissions from the fugitive emissions source. Finally, the portable monitor includes storage for storing the source identification signals and the fugitive emissions signals. The portable monitor is used in conjunction with or may even include a computer.