Still camera time lapse of snowstorm in Philadelphia on 1/21/2014. Also displayed are measurements made by a co-located weather station and instrumentation measuring concentrations of black carbon (BC) and CO2 from a Magee Scientific Aethalometer (AE-33). Spikes in BC concentration are real, and are due to the passage of diesel trains on the elevated train track near the sampling inlet. The train track can be seen in the bottom center of the movie frame.

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