10 Most Polluted Regions in Indonesia This Morning (5/1)

Air quality in West Java this morning is the worst in Indonesia. Based on the Air Pollution Standard Index (ISPU) page of the Ministry of Environment and Forestry (KLHK) on Monday (5/1/2026) at 08:00 AM WIB, it was revealed that the air quality index in West Java was 100.

According to the Directorate of Air Pollution Control KLHK, ISPU is a unitless number used to describe the ambient air quality conditions in a specific location and is based on the 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. Measurements of air pollutant parameters are spread across 72 stations in various regions.

(Read: Chad Became the Country with the Worst Air Quality in the World 2024)

Based on Ministerial Regulation of KLHK No. 14 of 2020 concerning the Air Pollution Standard Index, ISPU in the range of 0-50 indicates good air quality, the range of 51-100 means moderate air quality, and the range of 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 action.

Below West Java, Aceh ranks second worst in Indonesia with an air quality index of 99. Then, in the third position is Riau with an air quality index of 98.

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 Monday, January 5, 2026, at 08:00 AM WIB.

1. West Java: 100

2. Aceh: 99

3. Riau: 98

4. Banten: 95

5. Jambi: 92

6. West Sumatra: 87

7. North Sumatra: 81

8. Lampung: 74

9. Central Java: 69

10. Central Kalimantan: 68

(Read: Chad Became the Country with the Worst Air Quality in the World 2024)