10 Most Polluted Areas in Indonesia Tonight (March 21)

South Kalimantan 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 Saturday (March 21, 2026) at 6:00 PM WIB, it was revealed that the air quality index in South Kalimantan is 169.

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

ISPU calculations are 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: Five Latest Earthquakes Recorded by BMKG (Saturday, July 19, 2025 1:53:43 PM WIB))

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

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

Below South Kalimantan, Riau ranks second worst in Indonesia with an air quality index of 117. Then, West Java ranks third with an air quality index of 87.

This means that no region has hazardous air quality.

Here is the list of 10 provinces with the worst air quality index in Indonesia on Saturday, March 21, 2026 at 6:00 PM WIB.

1. South Kalimantan: 169

2. Riau: 117

3. West Java: 87

4. East Java: 84

5. Banten: 76

6. East Kalimantan: 74

7. Central Java: 68

8. West Kalimantan: 60

9. North Sumatra: 59

10. Yogyakarta: 55

(Read: Five Latest Earthquakes Recorded by BMKG (Saturday, July 19, 2025 1:53:43 PM WIB))