Bali''s Air Quality This Morning (1/9) Worst in Indonesia

Bali''s air quality this morning is the worst in Indonesia. Based on the Air Pollution Standard Index (APSI) page of the Ministry of Environment and Forestry (KLHK) on Monday (1/9/2025) at 08:00 AM WIB, it was revealed that Bali''s air quality index was 91.

According to the KLHK Directorate of Air Pollution Control, APSI is a unitless number used to describe ambient air quality conditions in specific locations and is based on impacts on human health, aesthetic value, and other living things.

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

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Based on Ministry of Environment and Forestry Regulation No. 14 of 2020 concerning the Air Pollution Standard Index, an APSI 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 harmful to humans, animals, and plants.

Next, 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 handling.

Below Bali, Lampung ranks second worst in Indonesia with an air quality index of 88. Then, in third place is West Sumatra with an air quality index of 87.

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 Monday, September 1, 2025, at 08:00 AM WIB.

1. Bali: 91

2. Lampung: 88

3. West Sumatra: 87

4. Central Kalimantan: 86

5. Banten: 85

6. West Java: 81

7. North Sumatra: 80

8. Central Java: 74

9. East Java: 70

10. South Kalimantan: 68

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