At 6am Wednesday, the level of PM25 particulate matter was measured at 45 microgrammes per cubic metre (microg/m3) of air, compared to 88 microgrammes on Tuesday. 
The province had heavy rain both early and late in the night, which improved the air quality and reduced the smog levels. 
Chaiwat Pattanapisalsak, director of the Songkhla-based 12th public health zone, said the air quality in the seven lower south provinces improved Wednesday morning. 
The PM2.5 level was measured at 26 mg/m3 in Muang Trang district, 26 mg/m3 in Muang Phatthalung, 32 mg/m3 in Muang Satun, 35 mg/m3 in Hat Yai, 25 mg/m3 Muang Pattnai, 32 mg/m3 in Muang Narathiwat and 45 mg/m3 in Muang Yala, Chiaiwat said.

Haze in Yala improves after overnight rain

Heavy rain overnight in Yala on Tuesday improved the air quality and helped the residents breathe easier after pollution levels rose dramatically in the southern province as a result of the smog caused by forest fires burning in Indonesia since early this month.