South Sumatra Most Polluted in Indonesia Tonight (2/9)

Air quality in South Sumatra tonight is the worst in Indonesia. According to the Air Pollution Standard Index (ISPU) page of the Ministry of Environment and Forestry (KLHK) on Tuesday (2/9/2025) at 6:00 PM WIB, the air quality index in South Sumatra was 95.

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

ISPU calculations are 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.

(Read: Floods and Extreme Weather, Most Natural Disasters in Indonesia until Early August 2023)

Based on Minister 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 more than 300 can seriously harm health and requires quick handling.

Below South Sumatra, Riau Islands ranks second worst in Indonesia with an air quality index of 92. Then, in third place is Riau with an air quality index of 91.

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 Tuesday, September 2, 2025 at 6:00 PM WIB.

1. South Sumatra: 95

2. Riau Islands: 92

3. Riau: 91

4. Lampung: 89

5. West Sumatra: 87

6. Bali: 85

7. North Sumatra: 84

8. Central Java: 77

9. East Java: 75

10. South Kalimantan: 68

(Read: Floods and Extreme Weather, Most Natural Disasters in Indonesia until Early August 2023)