The Air Pollutant Index (API) readings issued by the Department of Environment (DOE) are averages for 24 hours and have no direct correlation with the visibility range, said Deputy Prime Minister Datuk Seri Dr Wan Azizah Wan Ismail.

She said API readings channelled by DOE via Air Pollutants Index Malaysia are the country's official API readings and the data were verified first before displaying to the public.