PETALING JAYA (THE STAR/ASIA NEWS NETWORK): The haze in Malaysia is worsening as 11 areas recorded increasingly unhealthy API readings as of 8am on Thursday.

The Klang Valley and Negeri Sembilan recorded most of the high readings.

The area with the highest reading is Kuala Selangor (155) followed by Nilai (143), Port Klang (137), Banting (134) and Putrajaya (124).

Other areas include Bukit Rambai (117), Seremban and Batu Muda (112), PJ (107), Shah Alam (103) and Sri Aman (101).

Areas like Sri Aman, Shah Alam and PJ actually recorded moderate readings as of 6am but worsened.

Other areas recorded moderate and healthy readings.

An API of between 51 and 100 is considered moderate, 101-200 unhealthy, 200-300 very unhealthy and 300 and above hazardous.