West Java is the Most Polluted in Indonesia This Morning (April 18)

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 Saturday (18/4/2026) at 08.00 WIB, it was revealed that the air quality index in West Java is 114.

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 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: Countries with the Most Active Volcanoes in the World, Indonesia Ranks First)

Based on Minister of Environment and Forestry 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, Riau ranks second worst in Indonesia with an air quality index of 100. Then, Aceh ranks third with an air quality index of 89.

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 Saturday, 18 April 2026 at 08.00 WIB.

1. West Java: 114

2. Riau: 100

3. Aceh: 89

4. West Sumatra: 87

5. Jambi: 86

6. Banten: 83

7. South Sulawesi: 81

8. Central Kalimantan: 80

9. East Kalimantan: 72

10. East Java: 71

(Read: Countries with the Most Active Volcanoes in the World, Indonesia Ranks First)