Air Quality in Riau Islands Tuesday Morning (25/11) Worst in Indonesia

Air quality in 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 Tuesday (25/11/2025) at 08:00 AM 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 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, namely PM10, PM2.5, NO2, SO2, CO, O3, and HC. Air pollutant parameter measurements are spread across 72 stations in various regions.

(Read: Air Quality in Major Indonesian Cities is Poor, Far from WHO Standards)

Based on Ministry 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 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 201-300 range 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 91. Then, in third place is North Sumatra 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 Tuesday, November 25, 2025, at 08:00 AM WIB.

1. Riau Islands: 95

2. Central Kalimantan: 91

3. North Sumatra: 90

4. Jambi: 88

5. West Sumatra: 87

6. Central Java: 84

7. West Java: 81

8. East Java: 75

9. South Sulawesi: 73

10. North Sulawesi: 69

(Read: Air Quality in Major Indonesian Cities is Poor, Far from WHO Standards)