West Kalimantan Most Polluted in Indonesia Tonight (1/2)

Air quality in West Kalimantan tonight is the worst in Indonesia. Based on the Air Pollution Standard Index (ISPU) page of the Ministry of Environment and Forestry (KLHK) on Sunday (1/2/2026) at 6:00 PM WIB, it was revealed that the air quality index in West Kalimantan was 110.

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

ISPU calculations are based on the measurement results of seven air pollutant parameters, namely PM10, PM2.5, NO2, SO2, CO, O3, and HC. Air pollutant parameter measurements are spread across 72 stations in various regions.

(Read: Indication of Forest and Land Fire Area in Central Kalimantan Province in the Last Decade)

Based on Ministry of Environment and Forestry 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 means 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 over 300 can seriously harm health and requires quick action.

Below West Kalimantan, Riau ranks second worst in Indonesia with an air quality index of 99. Then, in third place is South Sumatra with an air quality index of 91.

This means that no region has hazardous air quality.

Here is a list of the 10 provinces with the worst air quality index in Indonesia on Sunday, February 1, 2026, at 6:00 PM WIB.

1. West Kalimantan: 110

2. Riau: 99

3. South Sumatra: 91

4. Jambi: 89

5. South Kalimantan: 86

6. West Java: 83

7. Aceh: 81

8. North Sumatra: 77

9. Lampung: 74

10. Central Kalimantan: 73

(Read: Indication of Forest and Land Fire Area in Central Kalimantan Province in the Last Decade)