10 Most Polluted Regions in Indonesia Tonight (Sept 15)

Air quality in Banten tonight is the worst in Indonesia. Based on the Air Pollution Standard Index (ISPU) page of the Ministry of Environment and Forestry (KLHK) on Monday (Sept 15, 2025) at 6:00 PM WIB, it was revealed that the air quality index in Banten was 95.

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 and is 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. Air pollutant parameter measurements are spread across 72 stations in various regions.

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Based on KLHK 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 in the range of more than 300 can seriously harm health and requires quick handling.

Below Banten, Riau ranks second worst in Indonesia with an air quality index of 93. Then, in third place is Riau Islands with an air quality index of 92.

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 Monday, September 15, 2025, at 6:00 PM WIB.

1. Banten: 95

2. Riau: 93

3. Riau Islands: 92

4. South Sumatra: 91

5. Aceh: 90

6. North Sumatra: 87

7. South Sumatra: 86

8. Central Kalimantan: 82

9. Central Java: 71

10. South Kalimantan: 68

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