The World's Most-Visited City Faces a Battle Against Toxic Smog
Commuters wearing masks ride in a Bangkok Mass Transit System Pcl SkyTrain, a unit of BTS Group Holdings Pcl, in Bangkok, Thailand. (Photographer: Brent Lewin/Bloomberg)

The World's Most-Visited City Faces a Battle Against Toxic Smog

(Bloomberg) -- For the second year in a row, some of the planet’s most toxic smog has choked Bangkok.
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