10 Most Polluted Regions in Indonesia Tonight (1/1)

Air quality in South Sumatra is the worst in Indonesia tonight. Based on the Air Pollution Standard Index (ISPU) page of the Ministry of Environment and Forestry (KLHK) on Thursday (1/1/2026) at 6:00 PM WIB, it was revealed that the air quality index in South Sumatra was 100.

According to the Directorate of Air Pollution Control of KLHK, ISPU is a unitless number used to describe ambient air quality conditions at a specific 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. Air pollutant parameter measurements are spread across 72 stations in various regions.

(Read: Majority of Indonesians Access Air Quality Information from Social Media)

Based on Ministry of Environment and Forestry Regulation No. 14 of 2020 concerning the Air Pollution Standard Index, an ISPU range of 0-50 indicates good air quality, a range of 51-100 indicates moderate air quality, and a range of 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 over 300 can seriously harm health and requires prompt attention.

Below South Sumatra, Riau ranks 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 that no region has hazardous air quality.

Here is a list of the 10 provinces with the worst air quality index in Indonesia on Thursday, January 1, 2026 at 6:00 PM WIB.

1. Sumatera Selatan: 100

2. Riau: 97

3. Banten: 95

4. Aceh: 94

5. Sumatera Barat: 87

6. Sumatera Utara: 80

7. Jawa Barat: 74

8. Kalimantan Timur: 71

9. Kalimantan Tengah: 70

10. Jawa Tengah: 68

(Read: Majority of Indonesians Access Air Quality Information from Social Media)