Urban light pollution: why we're all living with permanent 'mini jetlag' | Cities | The Guardian

Urban light pollution: why we're all living with permanent 'mini jetlag' | Cities | The Guardian: "Astronomer Dr Jason Pun of the Hong Kong University department of physics has been studying light pollution for nearly a decade. He says people often ask him if he’s crazy. “‘Hong Kong is supposed to be bright,’ they say. ‘Why are you even talking about light being some kind of pollution?’”

This is a city that is famous for its nightscape: neon signs advertising market stalls, pawn shops and steakhouses; illuminated skyscrapers; swanky malls that stay open – and stay lit – well into the night. “When I walk at night around some of these commercial centres, it’s so bright you almost want to wear your sunglasses,” Pun says.

Indeed, in our collective imaginations, cities are meant to be bright. But as studies begin to show that too much light can be detrimental to health, and fewer of us are able to see the stars when we look up, are cities getting too bright for our own good?

Hong Kong isn’t alone in celebrating light. Paris is still known as the City of Light; only slightly less glamorous Blackpool relies for tourism on its annual illuminations, when more than 1 million bulbs light a distance of 10km."



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