Air Pollution Sunday Night (21/12): South Sumatra Worst, How About Other Regions?

Air quality in South Sumatra tonight is the worst in Indonesia. Based on the Air Pollutant Standard Index (ISPU) page of the Ministry of Environment and Forestry (KLHK) on Sunday (21/12/2025) at 6:00 PM WIB, it was revealed that the air quality index in South Sumatra was 101.

According to the KLHK Directorate of Air Pollution Control, 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 calculations are based on the measurement results of seven air pollutant parameters: PM10, PM2.5, NO2, SO2, CO, O3, and HC. Measurements of these air pollutant parameters are distributed across 72 stations in various regions.

(Read: Update on the Number of Facilities Damaged by Floods and Landslides in Sumatra (December 11, 2025))

Based on KLHK Regulation No. 14 of 2020 concerning the Air Pollutant 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 harmful to humans, animals, and plants.

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

Below South Sumatra, Riau ranks second worst in Indonesia with an air quality index of 96. Then, in third place is Banten with an air quality index of 95.

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 Sunday, December 21, 2025, at 6:00 PM WIB.

1. South Sumatra: 101

2. Riau: 96

3. Banten: 95

4. Jambi: 91

5. Aceh: 86

6. North Sumatra: 83

7. North Sumatra: 81

8. Central Kalimantan: 80

9. Lampung: 74

10. Central Java: 69

(Read: Update on the Number of Facilities Damaged by Floods and Landslides in Sumatra (December 11, 2025))