VIENTIANE (Vientiane Times/ANN): Several areas across Laos recorded PM2.5 concentrations exceeding safety limits, posing health risks to sensitive groups, according to a report issued by the ...

Using sensor-based monitors, the NGO recorded PM2.5 levels at eight locations along the marathon route. Disturbingly, all locations exceeded the WHO’s safe level of 15 µg/m³. The lowest ...