Lewis Hamilton will be hoping his march towards a sixth Formula One world title around the streets of Singapore this week is not affected by smoke from wildfires.
Formula One bosses are reported to have a contingency plan in place should the "highly changeable" air quality deteriorate, though the race weekend is still scheduled to go ahead as planned.
Hamilton is currently leading Formula 1 Drivers’ championship after 14 races. He is now looking for a third consecutive triumph in Singapore.
Mercedes team principal Toto Wolff also expects Ferrari to be in the shake-up in Singapore, despite the Italian marque struggling on circuits lacking long straights this season.
"We knew that Spa and Monza would be difficult for us," Wolff said of the previous two races. "On paper, we should be strong in Singapore -- as should Red Bull. Let's see if we are really demolishing them there. But I have no doubt that Ferrari will have learned and will have a good package."