10 Most Polluted Regions in Indonesia This Morning (12/12)

Air quality in Riau this morning is the worst in Indonesia. Based on the Air Pollution Standard Index (ISPU) page of the Ministry of Environment and Forestry (KLHK) on Friday (12/12/2025) at 08:00 AM WIB, it was revealed that Riau's air quality index was 100.

According to the Directorate of Air Pollution Control KLHK, ISPU is a unitless number used to describe ambient air quality conditions at a specific location, based on its impact on human health, aesthetic value, and other living organisms.

ISPU calculation is based on the measurement results of seven air pollutant parameters, namely PM10, PM2.5, NO2, SO2, CO, O3, and HC. Measurements of air pollutant parameters are spread across 72 stations in various regions.

(Read: Trends in Volcanic Eruptions in Recent Years)

Based on Ministry of Environment and Forestry Regulation No. 14 of 2020 concerning the Air Pollution Standard Index, an ISPU in the range of 0-50 indicates good air quality, 51-100 indicates moderate air quality, and 101-200 indicates unhealthy air quality that is detrimental to humans, animals, and plants.

Furthermore, very unhealthy air quality in the range of 201-300 can increase health risks for sensitive groups. Meanwhile, hazardous air quality above 300 can seriously harm health and requires prompt action.

Below Riau, West Java ranks second worst in Indonesia with an air quality index of 98. Then, in third place is North Sumatra with an air quality index of 97.

This means that no region has hazardous air quality.

Here is a list of the 10 provinces with the worst air quality index in Indonesia on Friday, December 12, 2025, at 08:00 AM WIB.

1. Riau: 100

2. West Java: 98

3. North Sumatra: 97

4. Banten: 95

5. Jambi: 91

6. Central Kalimantan: 88

7. West Sumatra: 87

8. Aceh: 85

9. West Papua: 84

10. North Sumatra: 82

(Read: Trends in Volcanic Eruptions in Recent Years)