10 Most Polluted Areas in Indonesia This Morning (April 21)

West Java has the worst air quality in Indonesia this morning. Based on the Air Pollution Standard Index (ISPU) page of the Ministry of Environment and Forestry (KLHK) on Tuesday (April 21, 2026) at 08.00 WIB, it was revealed that the air quality index in West Java is 153.

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. Pollutant parameter measurements are spread across 72 stations in various regions.

(Read: Floods Dominate Natural Disasters in Indonesia at the End of February 2024)

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

Below West Java, DKI Jakarta ranks second worst in Indonesia with an air quality index of 122. Then, East Java ranks third with an air quality index of 101.

This means that no region has hazardous air quality.

Below is the list of 10 provinces with the worst air quality index in Indonesia on Tuesday, April 21, 2026 at 08.00 WIB.

1. West Java: 153

2. DKI Jakarta: 122

3. East Java: 101

4. Riau: 100

5. Banten: 93

6. Lampung: 90

7. Jambi: 89

8. West Sumatra: 87

9. Aceh: 86

10. South Sulawesi: 80

(Read: Floods Dominate Natural Disasters in Indonesia at the End of February 2024)