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This report describes a solution to the challenge of monitoring formaldehyde levels accurately in real-time, LBNL’s new VOC True Read device that is now ready for commercialization. Its innovative trap design strips water vapor, alcohols, and other VOCs from the sample, allowing formaldehyde — or other target gases — to pass through to a detector. The filter presents an economical answer to a long-sought method for sensitive formaldehyde measurement because it can be attached to, and can retrofit, in-place sensors to increase their detection accuracy. The filter’s internal structure can be arrayed various ways to adsorb other interferents, as needed. The device answers a widely recognized need for accurate, long-term, inexpensive, real-time monitoring of building air for formaldehyde to assist exposure assessment and demand- controlled ventilation. It can be added to real-time or passive monitors for formaldehyde, such as electrochemical sensors in handheld devices or table-top monitors with sensors that respond to oxygenated VOCs as well as formaldehyde.