10 Most Polluted Regions in Indonesia Tonight (August 22)

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 Friday (August 22, 2025) at 6:00 PM WIB, it was revealed that the air quality index in Riau Islands was 100.

According to the Directorate of Air Pollution Control KLHK, ISPU is a dimensionless 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. Measurements of air pollutant parameters are spread across 72 stations in various regions.

(Read: Volcanic Eruption Trends in Recent Years)

Based on Minister of Environment and Forestry Regulation No. 14 of 2020 concerning the Air Pollution Standard Index, an ISPU range of 0-50 indicates good air quality, 51-100 indicates 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 rapid intervention.

Below Riau Islands, Bali ranks second worst in Indonesia with an air quality index of 94. Then, in third place is Riau with an air quality index of 91.

This means that no region has hazardous air quality.

Here is a list of the 10 provinces with the worst air quality index in Indonesia on Friday, August 22, 2025, at 6:00 PM WIB.

1. Riau Islands: 100

2. Bali: 94

3. Riau: 91

4. Aceh: 90

5. East Java: 88

6. West Sumatra: 87

7. DKI Jakarta: 86

8. Banten: 82

9. North Sumatra: 76

10. West Java: 75

(Read: Volcanic Eruption Trends in Recent Years)