whyy.org/articles/light-pollution-pennsylvania-stargazing Light pollution, wildfire smoke threaten view of the stars in the Philly suburbs
The night sky over Bucks County now yields a few dozen stars where one stargazer once counted hundreds. The culprit: night skies brightening nearly 10% a year on average since 2011, compounded by wildfire haze drifting down from Canada.
— via WHYY, Kenny Cooper
