What does the small dotted line that just started appearing on the map represent?
Does it show power distribution lines, fiber optic lines, water mains or something else?
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The underlying map for PurpleAir comes from OpenStreetMap, as is noted in the small print in the lower right hand corner. Going there and looking at the map key, it shows that a dotted red line is a ‘Footway’ (sidewalk).
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Thank you @lucienve!
I never would have figured that out.
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