10 Most Polluted Areas in Indonesia Tonight (March 15)

Riau has the worst air quality in Indonesia tonight. Based on the Air Pollution Standard Index (ISPU) page of the Ministry of Environment and Forestry (KLHK) on Sunday (March 15, 2026) at 18:00 WIB, it was revealed that the air quality index in Riau is 97.

According to the KLHK Air Pollution Control Directorate, ISPU is a unitless number used to describe ambient air quality conditions at a specific location and is based on impacts on human health, aesthetic values, and other living beings.

The ISPU calculation is based on measurements 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: Many Forest Fires in Concession Areas, Especially Palm Oil Concessions)

Based on KLHK Regulation No. 14 of 2020 concerning the Air Pollution Standard Index, ISPU in the 0-50 range indicates good air quality, 51-100 means moderate air quality, and 101-200 indicates unhealthy air that is harmful to humans, animals, and plants.

Next, air quality in the 201-300 range is very unhealthy and can increase health risks for sensitive groups. Meanwhile, air quality in the range above 300 is hazardous, can seriously harm health, and requires immediate handling.

Below Riau, Jambi ranks second worst in Indonesia with an air quality index of 93. Then, Central Kalimantan is in third place with an air quality index of 91.

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 Sunday, March 15, 2026 at 18:00 WIB.

1. Riau: 97

2. Jambi: 93

3. Central Kalimantan: 91

4. West Sumatra: 87

5. Aceh: 84

6. West Java: 83

7. Central Java: 82

8. South Sulawesi: 79

9. South Kalimantan: 78

10. East Java: 71

(Read: Many Forest Fires in Concession Areas, Especially Palm Oil Concessions)