Riau Islands Most Polluted in Indonesia Tonight (13/11)

Air quality in Riau Islands tonight is the worst in Indonesia. Based on the Air Pollution Standard Index (ISPU) page of the Ministry of Environment and Forestry (KLHK) on Thursday (13/11/2025) at 6:00 PM WIB, it was revealed that the air quality index in Riau Islands was 95.

According to the Directorate of Air Pollution Control KLHK, ISPU is a unitless number used to describe the ambient air quality conditions in a specific 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: Floods Still the Most Frequent Disaster in Indonesia Until March 2025 )

Based on KLHK Regulation No. 14 of 2020 concerning the Air Pollution Standard Index, 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 detrimental to humans, animals, and plants.

Next, very unhealthy air quality in the range of 201-300 can increase health risks in sensitive groups. Meanwhile, hazardous air quality in the range of more than 300 can seriously harm health and requires rapid intervention.

Below Riau Islands, Riau ranks second worst in Indonesia with an air quality index of 91. Then, in third place is Jambi with an air quality index of 89.

This means no region has hazardous air quality.

Here is the list of the 10 provinces with the worst air quality index in Indonesia on Thursday, November 13, 2025, at 6:00 PM WIB.

1. Riau Islands: 95

2. Riau: 91

3. Jambi: 89

4. West Sumatra: 87

5. South Sumatra: 86

6. West Java: 85

7. Central Kalimantan: 82

8. South Sulawesi: 75

9. Central Java: 74

10. North Sumatra: 69

(Read: Floods Still the Most Frequent Disaster in Indonesia Until March 2025 )