This advertisement from Beckman Instruments highlights the many instruments and systems that could be used to monitor and control air pollution. This includes a "mobile monitor" which was an RV fitted out with various pieces of monitoring equipment. This likely included some of the instruments mentioned by name in this ad: sulfur dioxide analyzer, acralyzers, ultraviolet nitrogen dioxide analyzers, infrared emission analyzers, hydrocarbon analyzers, and vehicle emissions analysis systems.
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Beckman Instruments, Inc. “Join the Battle against Air Pollution!,” 1960–1969. Beckman Historical Collection, Box 49, Folder 28. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/79407x177.
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