A total of 36 areas across Malaysia recorded Air Pollutant Index (API) levels within the unhealthy range as of 4:30 PM on Tuesday, according to data from the Malaysian Air Pollutant Index Management System (APIMS) portal.

Selangor emerged as one of the most severely affected states, with Johan Setia logging the nation’s highest API reading at 176. Elevated levels were also recorded across the state in Shah Alam (170), Klang (164), Banting (163), Petaling Jaya (160), and Kuala Selangor (160).

In the Klang Valley region, Federal Territories recorded hazardous air quality, with Cheras at 169, Putrajaya at 165, and Batu Muda at 156.

Breakdown of Unhealthy API Readings by State

Negeri Sembilan: Nilai (174), Port Dickson (167), and Seremban (165).
Melaka: Bandaraya Melaka (174), Bukit Rambai (170), and Alor Gajah (161).
Johor: Pasir Gudang (173), Larkin (170), Batu Pahat (167), Tangkak (165), Kota Tinggi (164), Pengerang (163), Segamat (160), and Kluang (155).
Pahang: Rompin (159), Indera Mahkota Kuantan (157), Balok Baru Kuantan (157), and Jerantut (145).
Sarawak: IPD Serian (175), Kuching (158), Samarahan (157), and Samalaju (116).
Perak, Terengganu & Penang: Seri Manjung in Perak recorded 157; Kemaman (146) and Kuala Terengganu (135) in Terengganu; Minden (128) and Balik Pulau (117) in Penang.

Under national air quality standards, an API reading of 0 to 50 indicates good air quality, 51 to 100 is moderate, 101 to 200 is unhealthy, 201 to 300 is very unhealthy, and readings exceeding 300 are categorized as hazardous.