unusually heavy snowfall

Orange-yellow dust clouds from the Sahara desert have covered many areas in Greece, causing authorities to issue health warnings.

Nearly 300 schools were forced to close due to cold weather and heavy snowfall across the UK in recent days.

The British government on January 18 announced its willingness to mobilize troops to clear snow on traffic routes, after the country suffered heavy and prolonged snowfall.

The weekends of England and France have suffered from unusually heavy snowstorms. Hundreds of flights were postponed or canceled in London and Paris.