The runways of three airports were forced to close due to the deteriorating haze on Sunday morning, Malaysia Airports Berhad (MAB) said.
In a series of tweets, MAB said the affected airports were the Sultan Abdul Aziz Shah Airport in Subang, Sultan Abdul Halim Airport in Alor Setar and Sultan Azlan Shah Airport in Ipoh.
MAB said visibility fell to 350m at the Sultan Abdul Aziz Shah Airport as of 6.35am.
"The airport runway was declared closed until further notice. All passengers are advised to check with the respective airlines on the flight schedules," it said.
MAB also said that visibility was at 500m for both Sultan Abdul Halim Airport and Sultan Azlan Shah Airport as of 7.20am and 7.30am respectively.
It, however, said that operations were running as usual at the Kuala Lumpur International Airport (KLIA) and Kuala Lumpur International Airport 2 (KLIA2).
"Visibility at KLIA and KLIA2 was reported at 1000m as of 8am this morning. Airport operations are currently running as usual.
"However, all passengers are advised to check with the respective airlines on their flight schedules," it added.