10 Most Polluted Regions in Indonesia Tonight (24/11)

Air quality in Riau Islands tonight is the worst in Indonesia. Based on the Air Pollutant Standard Index (ISPU) page of the Ministry of Environment and Forestry (KLHK) on Monday (24/11/2025) at 18:00 WIB, the air quality index in Riau Islands was 95.

According to the KLHK's Directorate of Air Pollution Control, ISPU 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.

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

(Read: West Kalimantan Produced the Most CO2 Emissions from Forest and Land Fires Until July 2023)

Based on KLHK Regulation No. 14 of 2020 concerning the Air Pollutant Standard Index, an ISPU 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 more than 300 can seriously harm health and requires quick action.

Below Riau Islands, Central Kalimantan ranks second worst in Indonesia with an air quality index of 90. Then, in third place is South Sumatra with an air quality index of 89.

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 Monday, November 24, 2025, at 18:00 WIB.

1. Riau Islands: 95

2. Central Kalimantan: 90

3. South Sumatra: 89

4. Riau: 88

5. North Sumatra: 87

6. West Sumatra: 86

7. Jambi: 85

8. West Java: 79

9. East Java: 75

10. South Sulawesi: 73

(Read: West Kalimantan Produced the Most CO2 Emissions from Forest and Land Fires Until July 2023)