10 Most Polluted Regions in Indonesia Tonight (26/10)

Air quality in Riau Islands tonight is the worst in Indonesia. Based on the Air Pollution Standard Index (ISPU) page of the Ministry of Environment and Forestry (KLHK) on Sunday (26/10/2025) at 6:00 PM WIB, it was revealed that the air quality index in Riau Islands was 98.

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

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.

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

Next, very unhealthy air quality in the range of 201-300 can increase health risks for sensitive groups. Meanwhile, hazardous air quality in the range of over 300 can seriously harm health and requires quick handling.

Below Riau Islands, Banten ranks second worst in Indonesia with an air quality index of 95. Then, in third place is Aceh with an air quality index of 88.

This means no region has hazardous air quality.

Here is a list of the 10 provinces with the worst air quality index in Indonesia on Sunday, October 26, 2025 at 6:00 PM WIB.

1. Riau Islands: 98

2. Banten: 95

3. Aceh: 88

4. West Sumatra: 87

5. West Java: 83

6. South Sulawesi: 75

7. Central Java: 73

8. Central Kalimantan: 72

9. DKI Jakarta: 64

10. South Kalimantan: 63

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