Introduction to rmw instruments
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Introduction to RMW Instruments. Tom Henry RMW Company, Denver CO Tony Hansen Magee Scientific Company, Berkeley CA. Smoke and Exhaust: Aesthetic Impacts. Smoke & exhaust particles absorb and reflect sunlight, contributing to haze

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Introduction to RMW Instruments

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Introduction to rmw instruments

Introduction to RMW Instruments

Tom Henry

RMW Company, Denver CO

Tony Hansen

Magee Scientific Company, Berkeley CA

Smoke and exhaust aesthetic impacts

Smoke and Exhaust: Aesthetic Impacts

  • Smoke & exhaust particles absorb and reflect sunlight, contributing to haze

  • Regional haze and visibility management important issues in West

Smoke and exhaust listed air toxics

Smoke and Exhaust: Listed Air Toxics

  • Toxic components

    • Specific compounds require specific chemical analyses

    • Analyses cumbersome & expensive

  • Accompanying components may permit more rapid detection by optical means

    • Black soot

    • UV-absorbing material

Analytical basis

Analytical Basis

  • Optically-absorbing material an indicator for diesel exhaust, wood- and tobacco smoke

    • “Black” carbon (‘BC’, ‘EC’)

    • “UV-absorbing material” (‘UVPM’)

  • Optical analysis is fast, sensitive, can be performed on-the-spot

Analytical method optical absorption

Analytical Method– Optical Absorption

Optical vs chemical analyses ambient air

Optical vs. Chemical Analyses: Ambient Air

“Six Cities Study”: Harvard School of Public Health

Optical vs chemical analyses tobacco smoke

Optical vs. Chemical Analyses: Tobacco Smoke

Report published by Lawrence Berkeley National Laboratory

Analytical instrument aethalometer

Analytical Instrument: Aethalometer™

  • While continuously collecting sample, measures optical absorption in real time at 2 wavelengths (880 nm & 370 nm UV)

  • Converts optical absorption to mass concentration of BC and UVPM

  • Real-time data: 1 second / 1 minute / 1 hour

Analytical instrument aethalometer1

Analytical Instrument : Aethalometer™

19-inch rack mount

Analytical instrument aethalometer2

Analytical Instrument : Aethalometer™

Battery-powered ‘Portable’

Fireplace smoke

Fireplace Smoke

Cigarette smoke

Cigarette Smoke

Agricultural burning smoke

Agricultural-Burning Smoke

Bus yard diesel exhaust community impact

Bus Yard Diesel Exhaust– Community Impact

Diesel indoors truck enters hall

Diesel Indoors: Truck Enters Hall

On the bus in boston

On the Bus in Boston

In a car in boston

In a Car in Boston



  • Black carbon & UV-absorbing carbon indicate diesel exhaust, wood smoke,tobacco smoke

  • Aethalometer™ uses optical method to measure BC and UVPM in real time

  • Aethalometer on-the-spot data equivalent to standard chemical analyses



  • Harvard School of Public Health

  • Lawrence Berkeley National Laboratory

  • For further information

  • Representative

    Tom Henry, RMW Company,

    (303) 388-0109

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