Aceh Most Polluted in Indonesia Tonight (31/12)

Air quality in Aceh tonight is the worst in Indonesia. Based on the Air Pollution Standard Index (ISPU) page of the Ministry of Environment and Forestry (KLHK) on Wednesday (31/12/2025) at 18:00 WIB, Aceh's air quality index was revealed to be 98.

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

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 distributed across 72 stations in various regions.

(Read: There Are Still 381 High-Risk Forest Fire Hotspots in Indonesia in Early 2023)

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

Below Aceh, Jambi ranks second worst in Indonesia with an air quality index of 97. Then, in third place is Riau with an air quality index of 96.

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 Wednesday, December 31, 2025, at 18:00 WIB.

1. Aceh: 98

2. Jambi: 97

3. Riau: 96

4. Banten: 95

5. South Sumatra: 92

6. West Sumatra: 87

7. North Sumatra: 81

8. West Java: 76

9. East Java: 75

10. Lampung: 74

(Read: There Are Still 381 High-Risk Forest Fire Hotspots in Indonesia in Early 2023)