Learning's biggest stories, December 18
PM2.5 pollution returned this week, with Bangkok having the third worst air quality in the world.
Prime Minister Prayut Chan-o-cha again ordered government agencies to take action.
New commemorative 100-baht banknotes were issued that could be mistaken for 1,000-baht notes.
The notes mark the Royal Coronation Ceremony of 2019, and the colour of the 100-baht and 1,000-baht notes is similar.
Bangkok commuters can enjoy free travel for a time on two new rail routes which were opened on Wednesday.
The new Green Line extension runs from Wat Phra Sri Mahathat to Khu Khot, and the Gold Line, the country's first driverless monorail, runs from Krung Thon Buri to Khlong San.
This year's New Year countdown celebrations will go ahead, the government said.
However, parties may have to be divided into small zones with a limited number of participants.
