North Sumatra's Air Quality on Sunday Morning (January 11) is the Worst in Indonesia

Air quality in North Sumatra this morning is the worst in Indonesia. Based on the Air Pollution Standard Index (ISPU) page of the Ministry of Environment and Forestry (KLHK) on Sunday (January 11, 2026) at 08:00 AM WIB, it was revealed that the air quality index in North Sumatra was 84435.

According to the Directorate of Air Pollution Control of KLHK, ISPU is a unitless number used to describe ambient air quality conditions at a certain location and is based on the 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. Air pollutant parameter measurements are spread across 72 stations in various regions.

(Read: Jakarta's Air Quality This Morning is the Second Worst in the World (Friday, June 17, 2022))

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 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 prompt action.

Below North Sumatra, Riau ranks second worst in Indonesia with an air quality index of 112. Then, in third place is South Sumatra with an air quality index of 103.

This means that North Sumatra has hazardous air quality.

Here is a list of the 10 provinces with the worst air quality index in Indonesia on Sunday, January 11, 2026, at 08:00 AM WIB.

1. North Sumatra: 84435

2. Riau: 112

3. South Sumatra: 103

4. Banten: 95

5. Jambi: 91

6. West Sumatra: 86

7. North Sumatra: 84

8. Aceh: 83

9. Lampung: 74

10. East Kalimantan: 70

(Read: Jakarta's Air Quality This Morning is the Second Worst in the World (Friday, June 17, 2022))