Air Pollution Saturday Night (1/11): West Sumatra is the Worst, How About Other Regions?

Air quality in West 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 Saturday (1/11/2025) at 6:00 PM WIB, it was revealed that the air quality index in West Sumatra was 96.

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

(Read: Volcanic Eruption Trends in Recent Years)

Based on KLHK Regulation No. 14 of 2020 concerning the Air Pollutant 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 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 quick handling.

Below West Sumatra, Riau Islands ranks second worst in Indonesia with an air quality index of 94. Then, in third place is Aceh with an air quality index of 87.

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 Saturday, November 1, 2025, at 6:00 PM WIB.

1. West Sumatra: 96

2. Riau Islands: 94

3. Aceh: 87

4. Riau: 84

5. West Java: 83

6. South Sumatra: 82

7. North Sumatra: 79

8. Central Java: 78

9. Banten: 73

10. Central Kalimantan: 68

(Read: Volcanic Eruption Trends in Recent Years)