South Sumatra Most Polluted in Indonesia Tonight (Jan 24)

Air quality in South Sumatra tonight is the worst in Indonesia. Based on the Air Pollution Standard Index (ISPU) page of the Ministry of Environment and Forestry (KLHK) on Saturday (January 24, 2026) at 6:00 PM WIB, it was revealed that the air quality index in South Sumatra was 98.

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

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

(Read: Distribution of Fatalities Due to Floods and Landslides in Aceh (December 9, 2025))

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 means 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 above 300 can seriously harm health and requires prompt action.

Below South Sumatra, West Java ranks as the second worst in Indonesia with an air quality index of 97. Then, in third place is Banten with an air quality index of 95.

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 Saturday, January 24, 2026, at 6:00 PM WIB.

1. South Sumatra: 98

2. West Java: 97

3. Banten: 95

4. North Sumatra: 91

5. Jambi: 88

6. Riau: 85

7. Aceh: 84

8. North Sumatra: 77

9. Central Kalimantan: 76

10. Lampung: 74

(Read: Distribution of Fatalities Due to Floods and Landslides in Aceh (December 9, 2025))