The municipal meteorological station has also issued the city's first orange fog warning.

北京市气象台发布了北京史上首个霾橙色预警。

Last week was a particularly cold one across the UK, with snow, ice and fog warnings in several places.

上周，冷空气席卷英国，多地发布大雪、结冰和大雾天气警报。

Don’t ignore the fog warning signs.

【sign】不要忽视雾警标志。