Aswin Kwanmuang said the suspension started at noon today and continue until Friday.
The decision followed the Pollution Control Department's report of unsafe levels of PM2.5 - airborne particulates 2.5 microns or less in diameter - in 39 locales in and around the city, of which 23 were along main roads.
The level hit 141 micrograms of PM2.5 per cubic metre of air - nearly three times the safe limit of 50 - on Rama II Road in Muang Samut Sakhon.