Can you list some technologies or commercial sensors that were cited in the solicitation?
Can you list some technologies or commercial sensors that were cited in the solicitation as "badge-type sensors and watch-type sensors" for hazardous gas detection?

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jerry commented
The term "wearable" was used more generally to refer to watch-type sensors, however various sensor types have been researched or commercialised for physiological monitoring rather than hazardous material detection.
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Erica Wiener commented
An example of a badge-type sensor would be a vapor-monitor badge (e.g., for organic vapors and other volatile substances). Some of these badges are "dosimeter" badges that measure dose of exposure over time; many of these badge types would need to be sent away for analysis (which would be impractical for a first-responder scenario.) Watch-type sensors were referenced more broadly as a wearable-type sensor, but these sensor types have been studied or commercialized for physiological monitoring and not hazardous materials detection.