KUALA LUMPUR, Oct 6 — Haze conditions worsened sharply across Malaysia overnight, with 21 areas recording unhealthy air quality as of 8am today, almost double the 11 reported yesterday afternoon.

Johor was the worst-affected state, accounting for eight of the unhealthy readings, according to data from the Air Pollutant Index Management System (APIMS).

Batu Pahat recorded the highest Air Pollutant Index (API) reading nationwide at 188, followed by Kluang at 169, Segamat and Larkin at 166, Pasir Gudang at 165 and Tangkak at 164.

Kota Tinggi recorded an API of 155, while Pengerang stood at 154.

Elsewhere, Nilai in Negeri Sembilan recorded 161 and Seremban 157, while Bandaraya Melaka registered 155.