煤气可与烟雾缭绕的油灯和摇曳不定的蜡烛相媲美，在新世纪之初，富裕的伦敦人逐渐习惯了有煤气照明的房子，甚至街道。
Coal gas rivaled smoky oil lamps and flickering candles, and early in the new century, well-to-do Londoners grew accustomed to gaslit houses and even streets.
伦敦，因其臭名昭著的烟雾和极其严重的污染而闻名几百年，今天有着自中世纪以来最干净的空气。
London, renowned for centuries for its infamous smog and severe pollution, today has the cleanest air that it has had since the Middle Ages.
不过，伦敦大学国王学院环境研究主任弗兰克·凯利说，这种烟雾并不像大多数城市看到的工业烟雾那么危险。
However, Frank Kelly, director of environmental research at King's College London, says the smoke isn't as dangerous as the industrial smog seen in most cities.
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