The Lao Centre for Natural Resources andEnvironmental Research said that northern provinces are reporting highconcentration, including Phongsaly (257 micrograms per cubic metre), Xiengkhouang(209), and Oudomxay (over 300).
The reasons are due to the burning of strawand fields to prepare for a new crop, forest fires and traffic emissions.
Meanwhile, the Department ofHydrometeorology under the Ministry of Natural Resources andEnvironment has also warned local authorities and people of some northern,central and southern provinces about the possibility of thunderstorms, lightning,strong winds and hail in the coming days./.