All posts in “ASI Blog”

Google Maps Elevation API: Excel Example

When working with geospatial data on Google Earth (for example, from our AEREarth tool), you might need the elevations for some coordinates. If it’s only a handful, they’re easily found with Google Earth’s interface. But let’s say you want elevations for dozens, hundreds, or even thousands of locations.

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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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The Regional Haze Rule, Part III

In our last post on this topic we left off asking the question, “given how much wildland fires change year to year, how do we build an emissions inventory (EI) that is representative of a multi-year period, or a future period?” This is a confounding problem not only for the Regional Haze planning process but for any air quality planning exercise that a regulatory agency engages with. 

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Gold Ore Processing and Production Facilities Permitting

In 2011, the United States Environmental Protection Agency (EPA) promulgated National Emissions Standards for Hazardous Air Pollutants (NESHAP) for gold ore processing and production facilities. This rule is set forth in Volume 40 of the Code of Federal Regulations (CFR) Part 63 Subpart EEEEEEE (40 CFR 63 Subpart EEEEEEE). These  gold ore processing and production facilities are required to  obtain a federal permit under 40 CFR part 70 or 40 CFR part 71 (Title V operating permit), even if they are not associated with a major source. 

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