The Bangkok Metropolitan Administration's (BMA's) pollution centre reported a rise in the concentration of PM2.5 in two districts.
The centre found 58 microgrammes per cubic metre (µg/m³) of air in Nong Khaem district and 55 µg/m³ in Khlong Sam Wa district while the average PM2.5 level across Bangkok was 37.7 µg/m³.
The so-called safe level is 50µg/m³, according to the Pollution Control Department (PCD).
Bangkok governor Aswin Kwanmuang posted on Facebook that pollution rises to peak levels during the cold season from December to February.
Aswin said the BMA will work with other agencies to control sources of PM2.5 including traffic fumes, construction sites and outdoor burning.
Residents are being advised to try and limit their exposure to dust particles and monitor air quality reports from various sources.
Some recommended sites are www.bangkokairquality.com, www.air4bangkok.com, www.prbangkok.com and the mobile application AirBKK.
