Air Pollution Monday Night (22/12): Riau is the Worst, How About Other Regions?

Air quality in Riau tonight is the worst in Indonesia. Based on the Air Pollution Standard Index (ISPU) page of the Ministry of Environment and Forestry (KLHK) on Monday (22/12/2025) at 6:00 PM WIB, Riau's air quality index was 97.

According to the Directorate of Air Pollution Control KLHK, ISPU is a unitless number used to describe ambient air quality conditions in a specific location, 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: PM10, PM2.5, NO2, SO2, CO, O3, and HC. Measurements of air pollutant parameters are spread across 72 stations in various regions.

(Read: Provinces in Indonesia Most Frequently Hit by Floods until the End of 2025)

Based on KLHK Regulation No. 14 of 2020 concerning the Air Pollution Standard Index, an ISPU range of 0-50 indicates good air quality, 51-100 indicates moderate air quality, and 101-200 indicates unhealthy air quality that is detrimental to humans, animals, and plants.

Next, very unhealthy air quality in the range of 201-300 can increase health risks in sensitive groups. Meanwhile, hazardous air quality in the range of more than 300 can seriously harm health and requires quick handling.

Below Riau, Banten ranks second worst in Indonesia with an air quality index of 95. Then, in third place is Jambi with an air quality index of 91.

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 Monday, December 22, 2025, at 6:00 PM WIB.

1. Riau: 97

2. Banten: 95

3. Jambi: 91

4. Aceh: 88

5. West Java: 87

6. North Sumatra: 84

7. North Sumatra: 83

8. Lampung: 74

9. East Kalimantan: 72

10. Central Java: 69

(Read: Provinces in Indonesia Most Frequently Hit by Floods until the End of 2025)