Air Pollution Wednesday Morning (April 15): Riau is the Worst, How About Other Regions?

Riau has the worst air quality in Indonesia this morning. Based on the Air Pollution Standard Index (ISPU) page of the Ministry of Environment and Forestry (KLHK) as of Wednesday (April 15, 2026) at 08:00 WIB, the air quality index in Riau is 101.

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

(Read: Indonesia, the Country with the Worst Air Quality in Southeast Asia)

Based on KLHK Regulation No. 14 of 2020 concerning the Air Pollution Standard Index, ISPU in the 0-50 range 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 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 Riau, South Sumatra ranks second worst in Indonesia with an air quality index of 93. Then, West Java is third with an air quality index of 90.

This means no region has hazardous air quality.

Here is the list of 10 provinces with the worst air quality index in Indonesia on Wednesday, April 15, 2026 at 08:00 WIB.

1. Riau: 101

2. South Sumatra: 93

3. West Java: 90

4. West Sumatra: 87

5. Aceh: 86

6. Jambi: 83

7. South Sulawesi: 79

8. Central Kalimantan: 77

9. East Kalimantan: 76

10. DKI Jakarta: 75

(Read: Indonesia, the Country with the Worst Air Quality in Southeast Asia)