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I was there a few weeks ago. I sneezed endlessly and had to wear a mask indoors. It was really annoying.
Thai authorities urged Bangkok residents to work from home and wear respirator masks outdoors as air pollution level worsens in one of the world’s most-visited cities. 
Residents in the city of more than 10 million should work from home if possible, or switch from personal vehicles to public transport options if they need to commute, Bangkok governor Chadchart Sittipunt said in a statement on Tuesday. Authorities will seek to control activities causing dust particles such as outdoor burning, construction and combustion from truck engines, he said.
Air quality in the Thai capital has been mostly at unhealthy levels since the weekend with authorities warning that the hazardous dust particles, known as PM 2.5, may exceed safe levels again later this week. While the city’s air quality was moderate on Wednesday morning, it’s set to slide to unhealthy levels from Thursday, according to AirVisual.  
Bangkok and other Thai cities have grappled with poor air quality in recent years, with pollution tending to get worse in the dry season around December to February.