The API fell to below 100 in all parts of the state by 4pm, with Kuching recording 74 and Samarahan 85, compared to over 200 on Thursday.
At the Kuching Waterfront, there was relief among 12 local teams competing in a qualifying race for the Sarawak International Dragon Boat Regatta this weekend that the situation was better.
Rower Caitlyn Ong said her team did not train on Thursday when the air quality was at a very unhealthy level.
“It was horrible. But now we’re relieved that we are able to take part in the race,” she said.
The Klang Valley also recorded moderate API readings, with Batu Muda at Kuala Lumpur at 85, Shah Alam also at 85, Cheras at 70, and Putrajaya at 69.