Thai authorities have urged people in Bangkok to work from home and wear face masks outdoors as air pollution levels worsen in one of the world’s most visited cities.

And Bloomberg news today, Wednesday, quoted Bangkok Governor Chadchart Sitipunt as saying in a statement on Tuesday that residents of the city of more than 10 million people should work from home if possible or spend to use cars. People have access to public transportation options if they need to get around. He said authorities will try to control activities that cause the generation of dust particles, such as burning fuel in the open, works and burning fuel from truck engines.

In particular, the quality of the air in the Thai capital has registered unhealthy levels in the majority since the beginning of the week, and the authorities have warned that the levels of dangerous particles known as PM2.5 could once again surpass safe levels by the end of this week.