Most parts of the Klang Valley has been declared unhealthy as smog from forest fires in Sumatra continue to envelope parts of Peninsular Malaysia.

According to Department of Environment as at 6am on Tuesday, the Air Pollutant Index for Port Klang, Banting, Shah Alam, Petaling Jaya, Kuala Selangor, Batu Muda, Nilai were all at unhealthy levels.