South Sumatra's Air Quality on February 4 Evening is the Worst in Indonesia

South Sumatra's air quality tonight is the worst in Indonesia. Based on the Air Pollution Standard Index (ISPU) page of the Ministry of Environment and Forestry (KLHK) on Wednesday (February 4, 2026) at 18:00 WIB, it was revealed that the air quality index in South Sumatra is 100.

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: Warning, Jakarta's Morning Air Quality is the Worst in the World (Thursday, June 15, 2023))

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 South Sumatra, West Java ranks second worst in Indonesia with an air quality index of 99. Then, in third place is Banten with an air quality index of 95.

This means that no region has hazardous air quality.

Here is the list of 10 provinces with the worst air quality index in Indonesia on Wednesday, February 4, 2026 at 18:00 WIB.

1. South Sumatra: 100

2. West Java: 99

3. Banten: 95

4. Riau: 94

5. Jambi: 91

6. Aceh: 88

7. North Sumatra: 81

8. DKI Jakarta: 77

9. North Sumatra: 74

10. South Sulawesi: 70

(Read: Warning, Jakarta's Morning Air Quality is the Worst in the World (Thursday, June 15, 2023))