Air quality in Rompin climbed to the very unhealthy level as the Air Pollutant Index (API) reading hit 202 at 10pm last night.
Rompin is the only area in Malaysia with very unhealthy API reading, according to the Environment Department website.
In addition to Pahang, several areas in Kuala Lumpur, Putrajaya, Selangor, Negeri Sembilan, Malacca, Johor and Sarawak registered unhealthy API due to the current haze phenomenon.
The affected areas are Batu Muda (151) and Cheras (147) in Kuala Lumpur; Putrajaya (144); and Petaling Jaya (141), Shah Alam (131), Klang (114), Banting (124) and Johan Setia Klang (159) in Selangor.
Unhealthy API readings were also recorded in Nilai (148), Seremban (124) and Port Dickson (113) in Negeri Sembilan; Alor Gajah (108), Bukit Rambai (109) and Malacca City (102); and Tangkak, Johor (125).
The air quality in three areas in Sarawak remained unchanged last night, with unhealthy API recorded in Sri Aman (172), Samarahan (135) and Kuching (161).
An API reading of 0-50 shows good air quality; 51-100, moderate; 101-200, unhealthy; 201-300, very unhealthy and over 300, hazardous.