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Fenceline Monitoring

Turnkey Solution for Online VOCs and Odorous Compounds Analysis in Fenceline Monitoring


Fenceline Monitoring

Emissions from industry can negatively affect ambient air quality, and are a major contributor to poor air quality in many regions. Pollutant sources include both stack emissions and fugitive emissions during storage, processing and transport. Because of this, many countries have established fenceline regulations on levels of key pollutants, including VOCs, to protect workers and neighboring communities. For example, US EPA rule 40 CFR part 63 requires refineries to monitor benzene emissions at key emission sources within their facilities and at their fencelines.

Passive sampling, followed by offline analysis methodology, suffers from slow feedback, potential losses to sampling devices, and no meteorological data for source appointment. Fast VOC measurement, offered by online techniques, is increasingly requested by regulators to enable better science-based decisions. Common deployments include 1) setting up a network of stationary monitoring stations based on the prevailing wind directions, 2) running a single instrument behind multi-point sampling valves, 3) mapping VOC distributions on a routine basis along fenceline and within facilities using a mobile platform.

The TOFWERK real-time VOC analyzer –  Vocus CI-TOF offers a turnkey solution for online VOCs and odorous compounds analysis, without any sample preparation or GC separation, leading to a real-time and fast data output. These features of Vocus CI-TOF make in situ fenceline monitoring very efficient and simple. For benzene, it can reach LOD as low as 10 pptv per second, which enables fast and sensitive measurements of rapid changes in benzene levels at refinery fencelines. The system has a proven record of deployment with mobile laboratory to map VOC concentrations in industrial areas and assist the regulatory bodies to trace emission source and address odor complaints in residential neighborhoods. The real-time data can help regulatory agencies improve inventories of air pollution emissions, as well as enforcement of air quality standards.


  • Real-Time Fenceline Monitoring Using the Vocus CI-TOF

    • Real-time and fast data output capturing rapid changes in VOC concentrations at fencelines and also suitable for mobile monitoring
    • High mass resolving power enables identification of individual compounds from complex industrial emissions
    • Full spectrum acquisition allows measurements of a wide range of compounds simultaneously, including air toxics like BTEX and heteroatomic odorous compounds.

    Fenceline Monitoring

    A Vocus CI-TOF was installed in a mobile laboratory and driven in a search pattern around an industrial facility in eastern China. Patterns of VOC emissions over a scale of several kilometers can be used to pinpoint the sources of various industrial solvents and byproducts.


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