Air Pollution in Riau Islands This Morning (Nov 18) Worst in Indonesia

Air quality in the Riau Islands this morning is the worst in Indonesia. Based on the Air Pollution Standard Index (APSI) page of the Ministry of Environment and Forestry (KLHK) on Tuesday (Nov 18, 2025) at 08.00 AM WIB, it was revealed that the air quality index in the Riau Islands was 95.

According to the Directorate of Air Pollution Control, KLHK, APSI 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 organisms.

APSI calculation is based on the measurement results of seven air pollutant parameters, namely PM10, PM2.5, NO2, SO2, CO, O3, and HC. The measurement of these air pollutant parameters is distributed across 72 stations in various regions.

(Read: Even Though It Has Rained, Jakarta's Air Quality Is Still Bad)

Based on Ministry of Environment and Forestry Regulation No. 14 of 2020 concerning the Air Pollution Standard Index, an APSI in the range of 0-50 indicates good air quality, 51-100 means moderate air quality, and 101-200 signifies 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 immediate action.

Following Riau Islands, Jambi ranks as the second worst in Indonesia with an air quality index of 90. Then, in third place is Aceh with an air quality index of 87.

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 Tuesday, November 18, 2025, at 08.00 AM WIB.

1. Riau Islands: 95

2. Jambi: 90

3. Aceh: 87

4. West Java: 86

5. South Sumatra: 85

6. Central Java: 84

7. North Sumatra: 81

8. Lampung: 74

9. North Sulawesi: 70

10. East Kalimantan: 67

(Read: Even Though It Has Rained, Jakarta's Air Quality Is Still Bad)