West Java's Air Quality Tonight (Jan 25) is the Worst in Indonesia

Air quality in West Java tonight is the worst in Indonesia. Based on the Air Pollution Standard Index (ISPU) page of the Ministry of Environment and Forestry (KLHK) on Sunday (Jan 25, 2026) at 6:00 PM 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 ambient air quality conditions at a certain 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 these air pollutant parameters are spread across 72 stations in various regions.

(Read: Jakarta's Air Quality is Poor, Losing to Other ASEAN Capitals)

Based on KLHK Regulation No. 14 of 2020 concerning the Air Pollution Standard Index, 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 of more than 300 can seriously harm health and requires quick action.

Below West Java, Riau ranks second worst in Indonesia with an air quality index of 99. Then, in third place is South Sumatra with an air quality index of 96.

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, January 25, 2026, at 6:00 PM WIB.

1. West Java: 100

2. Riau: 99

3. South Sumatra: 96

4. Banten: 95

5. Jambi: 87

6. Aceh: 84

7. North Sumatra: 79

8. Lampung: 74

9. West Nusa Tenggara: 72

10. Central Java: 68

(Read: Jakarta's Air Quality is Poor, Losing to Other ASEAN Capitals)