But astronomers, environmentalists and groups like the International Dark-Sky Association argue that the dome of glaring light over cities and towns from mercury-vapor bulbs and other security lights is a form of pollution.

• 但是天文学家、环保主义者以及国际黑暗天空协会等团体认为，水银灯和其他出于安全目的安装的灯具发出的笼罩在城市上空的耀眼光芒是一种污染。