Riau Night Air Pollution (4/5) Worst in Indonesia
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Riau has the worst air quality in Indonesia tonight. According to the Air Pollution Standard Index (ISPU) page of the Ministry of Environment and Forestry (KLHK) at 18:00 WIB on Monday (4/5/2026), Riau recorded an air quality index score of 95.
Per KLHK Air Pollution Control Directorate, ISPU is a unitless index describing ambient air quality at a location, rated based on impacts on human health, aesthetic values, and other living organisms.
ISPU calculation uses measurements of 7 air pollutant parameters: PM10, PM2.5, NO2, SO2, CO, O3, and HC. Measurements are taken across 72 monitoring stations nationwide.
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