West Sumatra's Air Quality This Morning (31/10) is the Worst in Indonesia

Air quality in West Sumatra this morning is the worst in Indonesia. Based on the Air Pollutant Standard Index (ISPU) page of the Ministry of Environment and Forestry (KLHK) on Friday (31/10/2025) at 08.00 AM WIB, it was revealed that the air quality index in West Sumatra was 96.

According to the Directorate of Air Pollution Control of KLHK, ISPU 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.

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

(Read: BNPB Records 52 Natural Disasters in Mid-August 2023, Forest and Land Fires Most Numerous)

Based on Ministry of Environment and Forestry Regulation No. 14 of 2020 concerning the Air Pollutant Standard Index, an ISPU in the range of 0-50 indicates good air quality, 51-100 indicates moderate air quality, and 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 handling.

Below West Sumatra, Banten ranks second worst in Indonesia with an air quality index of 95. Then, in third place is Riau Islands with an air quality index of 94.

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 Friday, October 31, 2025, at 08.00 AM WIB.

1. West Sumatra: 96

2. Banten: 95

3. Riau Islands: 94

4. West Java: 90

5. South Sumatra: 87

6. Jambi: 86

7. North Sumatra: 80

8. DKI Jakarta: 79

9. Central Kalimantan: 78

10. East Java: 77

(Read: BNPB Records 52 Natural Disasters in Mid-August 2023, Forest and Land Fires Most Numerous)