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Continuous analyzer stations draw ambient air into a variety of instruments, which analyze the air for specific components. Weather conditions are also monitored continuously at these stations. Passive samplers are much lower cost than continuous analyzers, and because they do not have any power requirements, they can be used in remote locations. Passive samplers allow for the uptake of air via a permeative or diffusive process. There are specific samplers for specific different substances. Passive samplers are collected on a monthly basis and the samplers are then sent for laboratory analysis.
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