All posts in “Emissions Characterization”

Helping sawmills maintain compliance

Sawmills in the Western United States have an intriguing history. As mostly European-descendant settlements of the 19th century American West forged deeper into resource extraction of wood to build homes and towns, sawmills were developed to process immense logs into usable lumber. Naturally, a power source was needed to propel the industry beyond the work of hand-sawyers. Technology used to power the mills included water turbines and steam engines, while boilers provided steam for a sawmill’s kilns.

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MOVES: Details make the design

Infrastructure and transportation are having a moment in media coverage and political efforts. These umbrella terms mostly bring ports, bridges, and roads to mind, but they also include something in Air Sciences’ wheelhouse: MOVES, the MOtor Vehicle Emission Simulator, developed and funded by the United States Environmental Protection Agency (EPA). Now in its third iteration, MOVES provides a snapshot of tailpipe emissions for on- and off-road motor vehicles. The model encompasses six common air pollutants (ground-level ozone, particulate matter, carbon monoxide, lead, sulfur dioxide, and carbon dioxide, known collectively as criteria air pollutants), greenhouse gases, and hazardous air pollutants.  

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The TEMPO Mission: Measuring Urban Pollution from Space

One Air Sciences’ team member’s graduate research at Portland State University (Oregon) clocked a lot of time with a tabletop ultraviolet (UV)-visible spectrometer. This equipment measures how much a chemical substance absorbs light. You see, Matt had painstakingly prepared hundreds of passive air pollution monitoring devices to conduct high-density measurements of nitrogen dioxide (NO2) in east Portland. To “extract” the adsorbed NO2 from the devices, an aqueous solution was prepared with spectral properties that changed with the amount of NO2 present. Perfect, tedious work for a grad student, but it ultimately produced some gratifying results.

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