The 8am reading was up from 174 at 4pm on Thursday. Kanowit rose sharply from 58 to 186, while Samarahan reached 184, Serian 180, Lundu 176 and Tebedu 166.

Several central Sarawak stations also saw steep overnight increases: Sibu climbed to 158, Sarikei to 157, Sri Aman and Bintulu to 153, and Mukah and Lubok Antu to 104.

Kapit was the only station to move into the moderate band among the locations highlighted in the morning update, at 93. Miri and ILP Miri remained moderate at 61 and 58, while Limbang and Bario were in the good range at 49 and 12.

The API is a 24-hour running measure. Readings from 101 to 200 are classified as unhealthy, so conditions can change with the next update. People in affected areas should check the latest readings and cut down prolonged outdoor activity while the air remains poor.