Air Pollution Sunday Night (31/8): Riau Islands Worst Hit, How About Other Regions?

Air quality in Riau Islands tonight is the worst in Indonesia. Based on the Air Pollution Standard Index (APSI) page of the Ministry of Environment and Forestry (KLHK) on Sunday (31/8/2025) at 18:00 WIB, it was revealed that the air quality index in Riau Islands was 91.

According to the Directorate of Air Pollution Control KLHK, APSI is a unitless number used to describe ambient air quality conditions at a specific location, based on its 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. Air pollutant parameter measurements are spread across 72 stations in various regions.

(Read: There Were 31 Disasters in Indonesia at the End of May 2024, Floods Dominated)

Based on Minister of Environment and Forestry Regulation No. 14 of 2020 concerning the Air Pollution Standard Index, 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 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 immediate action.

Below Riau Islands, West Sumatra ranks second worst in Indonesia with an air quality index of 87. Then, in third place is Central Kalimantan with an air quality index of 86.

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 Sunday, August 31, 2025 at 18:00 WIB.

1. Riau Islands: 91

2. West Sumatra: 87

3. Central Kalimantan: 86

4. Banten: 81

5. West Java: 79

6. North Sumatra: 76

7. Bali: 75

8. Central Java: 73

9. South Kalimantan: 68

10. Lampung: 67

(Read: There Were 31 Disasters in Indonesia at the End of May 2024, Floods Dominated)