West Sumatra Most Polluted in Indonesia This Morning (3/11)

Air quality in West Sumatra is the worst in Indonesia this morning. Based on the Air Pollution Standard Index (APSI) page of the Ministry of Environment and Forestry (KLHK) on Monday (3/11/2025) at 08:00 AM WIB, it was revealed that the air quality index in West Sumatra was 96.

According to the KLHK's Directorate of Air Pollution Control, APSI is a unitless number used to describe the ambient air quality conditions at a certain location and is based on the impact on human health, aesthetic value, and other living things.

APSI calculation is based on the measurement results of seven air pollutant parameters, namely PM10, PM2.5, NO2, SO2, CO, O3, and HC. The air pollutant parameter measurements are spread across 72 stations in various regions.

(Read: These are the Most Frequent Natural Disasters in Indonesia until Early September 2023)

Based on KLHK Regulation No. 14 of 2020 concerning the Air Pollution Standard Index, an APSI 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 harmful 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 handling.

Below West Sumatra, South Sumatra ranks second worst in Indonesia with an air quality index of 95. Then, in third place is West Java with an air quality index of 91.

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 Monday, November 3, 2025, at 08:00 AM WIB.

1. West Sumatra: 96

2. South Sumatra: 95

3. West Java: 91

4. Jambi: 90

5. Aceh: 87

6. Riau: 86

7. Central Kalimantan: 81

8. North Sumatra: 80

9. Central Java: 74

10. Banten: 69

(Read: These are the Most Frequent Natural Disasters in Indonesia until Early September 2023)