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Clean Air in SF Bay

Here's how clear the air is in the Bay these days of shelter-in-place. This is the Richmond Bridge as shot from Ina Coolbrith Park in Russian Hill, San Francisco. Here's an approximation of the source and target. The Richmond Bridge is visible at other times in the year, but I don't remember it being this super clear. 15.3 km line of sight. The map is from DataSF, https://sfgov.maps.arcgis.com/home/webmap/viewer.html