10 Most Polluted Regions in Indonesia Tonight (Sept 24)

Air quality in DKI Jakarta tonight is the worst in Indonesia. Based on the Air Pollution Standard Index (ISPU) page of the Ministry of Environment and Forestry (KLHK) on Wednesday (Sept 24, 2025) at 6:00 PM WIB, it was revealed that the air quality index in DKI Jakarta was 116.

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

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

(Read: 10 Provinces Most Affected by Floods in 2024)

Based on Minister 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 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 quick action.

Below DKI Jakarta, West Java ranks second worst in Indonesia with an air quality index of 99. Then, in third place is Banten with an air quality index of 97.

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 Wednesday, September 24, 2025, at 6:00 PM WIB.

1. DKI Jakarta: 116

2. West Java: 99

3. Banten: 97

4. West Sumatra: 95

5. Riau Islands: 92

6. Riau: 91

7. Bali: 90

8. Jambi: 86

9. East Java: 85

10. South Sumatra: 82

(Read: 10 Provinces Most Affected by Floods in 2024)