But they were worn more out of concern over the dense clouds of incense smoke than the still-hazardous PM2.5 air pollution.
The Chinese New Year Festival continues through Monday.
The Chao Por Pak Khlong Shrine near the Pak Khlong Market Flower Market was busy and billowing with smoke.
Administrators at Mangkon Kamalawat Temple, also known as Wat Leng Noei Yi, have this year banned a festival staple – the burning of silver and gold paper – in deference to efforts to reduce PM2.5 pollution.
Silpakorn University researchers were in the Yaowarat area, Bangkok’s Chinatown, checking both PM2.5 and noise levels.
They were happy to demonstrate the gadget they used for reporters and curious passers-by, explaining that the survey was a part of the university’s “Development of Artistic and Cultural Capital in Yaowarat” project.