City drafts regulation to cut light pollution

Teaching astronomy in a busy metropolis where the starry night sky is often obscured by light pollution is no easy task.

One of Han Yan's main jobs in his role at the Guangzhou youth science and technology education association in Guangdong province is to teach students how to observe the night sky.

"Our work is really affected by light pollution," he said. "We have to travel to the suburbs to get a really clear view of the stars."