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[Cliff Mass has some more information on his blog about the local effects of the smoke on Seattle](http://cliffmass.blogspot.com/2015/07/huge-plume-of-bc-wildfire-smoke-reaches.html).
Source (with higher resolution): [NASA’s LANCE Rapid Response](http://lance-modis.eosdis.nasa.gov/imagery/subsets/?subset=AERONET_Saturn_Island.2015186.terra.1km), captured by the [Moderate-Resolution Imaging Spectroradiometer](https://en.wikipedia.org/wiki/Moderate-Resolution_Imaging_Spectroradiometer) (MODIS)
[Labeled version](http://i.imgur.com/GI4HlRO.jpg) (not 100% accurate, but close enough)