Generally, VOC concentrations are measured in forests so that scientists can detect seasonal trends in emissions from a remote location. The results from these measurements can provide long-term data that can be applied to populated areas without the interference of occasional or incidental spikes in emissions. Thus, minor changes in VOC emission levels in forests can serve as indicators of higher level changes in surrounding areas. If a VOC concentration in a forest area spikes, it may be due to the incidence of activity in the immediate area. Such a change may at first appear significant, but the change isn’t so relative to the otherwise general inactivity.
If VOC emission levels increase over time in a forest area, the changes may indicate the diminishment of forest habitats and/or significant emissions in the surrounding area.
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