East Java Most Polluted in Indonesia Tonight (18/10)

Air quality in East Java is the worst in Indonesia tonight. Based on the Air Pollution Standard Index (ISPU) page of the Ministry of Environment and Forestry (KLHK) on Saturday (October 18, 2025) at 18:00 WIB, the air quality index in East Java was revealed to be 101.

According to the Directorate of Air Pollution Control KLHK, ISPU is a dimensionless number used to describe the ambient air quality conditions at a certain location and is based on its impact on human health, aesthetic value, and other living things.

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

(Read: Indonesia Has the Most Active Volcanoes in the World)

Based on KLHK Ministerial Regulation No. 14 of 2020 concerning the Air Pollution Standard Index, an ISPU in the range of 0-50 indicates good air quality, 51-100 means moderate air quality, and 101-200 indicates 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 quick action.

Below East Java, Banten occupies the second worst position in Indonesia with an air quality index of 95. Then, in third place is Aceh with an air quality index of 92.

This means no region has hazardous air quality.

Here is a list of the 10 provinces with the worst air quality index in Indonesia on Saturday, October 18, 2025, at 18:00 WIB.

1. East Java: 101

2. Banten: 95

3. Aceh: 92

4. Riau Islands: 90

5. South Sumatra: 89

6. South Kalimantan: 87

7. West Java: 84

8. East Kalimantan: 82

9. DKI Jakarta: 78

10. South Sulawesi: 75

(Read: Indonesia Has the Most Active Volcanoes in the World)