Riau's Air Quality on Monday Night (March 9) is the Worst in Indonesia

Riau's air quality is the worst in Indonesia tonight. Based on the Air Pollution Standard Index (ISPU) page of the Ministry of Environment and Forestry (KLHK) on Monday (March 9, 2026) at 18.00 WIB, it was revealed that Riau's air quality index is 97.

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: Air Quality in Major Indonesian Cities is Poor, Far from WHO Standards)

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, air quality is very unhealthy in the 201-300 range, which can increase health risks for sensitive groups. Meanwhile, air quality is hazardous in the range above 300, which can seriously harm health and requires immediate handling.

Below Riau, South Sumatra ranks second worst in Indonesia with an air quality index of 92. Then, North Sumatra ranks third with an air quality index of 91.

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 Monday, March 9, 2026 at 18.00 WIB.

1. Riau: 97

2. South Sumatra: 92

3. North Sumatra: 91

4. Jambi: 87

5. Aceh: 84

6. West Java: 83

7. DKI Jakarta: 78

8. Lampung: 74

9. East Java: 71

10. North Sumatra: 70

(Read: Air Quality in Major Indonesian Cities is Poor, Far from WHO Standards)