Riau Islands Most Polluted in Indonesia This Morning (26/10)

Air quality in the Riau Islands this morning is the worst in Indonesia. Based on the Air Pollution Standard Index (ISPU) page of the Ministry of Environment and Forestry (KLHK) on Sunday (26/10/2025) at 08.00 AM WIB, it was revealed that the air quality index in the Riau Islands was 98.

According to the Directorate of Air Pollution Control 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. Air pollutant parameter measurements are spread across 72 stations in various regions.

(Read: 4.6 M Earthquake Shakes 128 Km North of Lae, Papua)

Based on Ministry of Environment and Forestry Regulation No. 14 of 2020 concerning the Air Pollution Standard Index, an 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 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 the Riau Islands, Banten ranks second worst in Indonesia with an air quality index of 95. Then, in third place is Aceh with an air quality index of 90.

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, October 26, 2025, at 08.00 AM WIB.

1. Riau Islands: 98

2. Banten: 95

3. Aceh: 90

4. Jambi: 87

5. West Sumatra: 86

6. South Sumatra: 85

7. West Java: 84

8. East Java: 78

9. South Sulawesi: 75

10. Central Kalimantan: 72

(Read: 4.6 M Earthquake Shakes 128 Km North of Lae, Papua)