Factory blaze residents return home 5 PCD says air quality now safe enough published : 8 Jul 2021 at 05:00 5 Residents return home in the vicinity of the burnt factory of Ming Dih Chemical Co on Soi King Kaew 21 in Bangphli district, Samut Prakan, on Wednesday. (Photo: Nutthawat Wicheanbut) Residents living within a 2-5 kilometre radius of the burned-out Ming Dih Chemical Co factory in Bang Phli district of Samut Prakan have been allowed to return home after the Pollution Control Department (PCD) confirmed air quality in the area was at a safe level. Provincial governor Wanchai Kongkasem said on Wednesday that all areas within that radius of the factory had been examined to ensure safety for when people returned.