Why do some countries still have fog advisories?
A series of travel advisories issued by some countries are now in effect, and the weather forecast is not looking good for many areas around the world.
Here are five things you need to know about them.
Japan, Italy and South Korea have all lifted travel advisors on Thursday evening and Friday morning.
Some European countries have temporarily closed airports, and some travel advisements have been lifted in Germany, France, Italy, Spain, Poland, Portugal and Belgium.
In the UK, the National Rail Safety Authority said that it was suspending service on the entire Eastern and Northern Trains network until further notice.
The authority said that the rail network is “relatively stable” and that there were no known incidents.
Some French cities are expected to reopen on Friday, including Paris, Lyon, Marseille and Toulouse.
In France, a large area of the country has been declared a weather emergency.
The emergency measures have been in effect since Thursday afternoon.