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Met One Instruments, Inc. Air Quality Products for Tunnels

Protect Commuter & Employee Health with Reliable Sensors



Subway systems in America typically shuttle millions of people each day.



Recent studies, however, have found levels of PM2.5 air pollution to be alarmingly high in these underground transportation networks. Tunnels are restricted and confined, often with poor ventilation, making them naturally susceptible to air quality issues. Elevated levels of suspended PM2.5  air particulate can lead to respiratory conditions, lung cancer, and heart disease for commuters and employees.



Met One Instruments, Inc. offers several candidate products to measure air velocity, temperature and humidity, and particulate concentrations for tunnel monitoring. We also provide OEM particulate count and particle mass engines that integrate with comprehensive tunnel air monitoring and air handling systems. Sense and respond with confidence with Met One’s tunnel monitoring instrumentation.



E-BAM indoor
E-BAM indoor



Tunnel Monitoring Products:

  • E-BAM Plus - Met One Instruments

    E-BAM PLUS Environmental Beta Attenuation Mass Monitor

    The E-BAM Plus from Met One Instruments Powered by Acoem is a portable, real-time beta gauge which has EPA Approval for PM10 particulate measurements. The E-BAM Plus will satisfy users, regulators, and those from the health community by providing truly...

  • Swift 25.0

    Swift 25.0 Flow Calibrator

    The Swift 25.0 is a multi-function, truly portable flow calibrator. Specifically designed to audit and calibrate flow, pressure, and temperature of our higher flow rate ambient air sampling and monitoring instruments. Flow accuracy is NIST traceable.

  • Swift 6.0 Air Flow Meter

    The Swift 6.0 is a multi-function Air Flow Meter specifically designed for accurate low rate measurements. The device’s easy-to-read display shows flow rate, flow temperature, and ambient pressure. Flow measurements are traceable to our NIST standard and certification is provided...

  • BC-1060 - Met One Instruments

    BC 1060 Portable Black Carbon Monitor

    The BC 1060 Portable Black Carbon Monitor from Met One Instruments Powered by Acoem measures and reports black carbon concentrations, with user-selectable time resolution down to one minute, at both UV (370 nm) and IR (880 nm) illumination wavelengths. The...

  • ES-405

    ES-405 Simultaneous Particulate Profiler

    The ES-405 is a near reference air quality sensor designed to provide accurate real-time measurements of PM10, PM4, PM2.5, and PM1 particulate concentrations simultaneously. It reports these four key particulate concentrations in both indoor and outdoor environments. The rugged weatherproof...

  • The ES-642 Remote Dust Monitor

    Remote Dust Monitor ES-642

    Met One Instruments’ ES-642 Remote Dust Monitor is an industrial air-quality sensor designed to provide real time particle concentration measurements in both indoor and outdoor environments. Our ES-642 measures particulate concentration using a highly sensitive forward scatter laser nephelometer, which...

  • Visibility Sensor 6400

    The Model 6400 Visibility Sensor offered by Met One Instruments Powered by Acoem is designed to monitor visibility conditions over a range of 20ft-50miles (6m-80km). The Model 6400 includes both digital and relay outputs. The Digital RS232 output at 300-38,400...

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