A cloud of smog has covered the City of Singapore ahead of this weekends Singapore Grand Prix blown in by the prevailing winds from Sumatra.

The haze is a result of the farmers in neighboring Sumatra burning parts of the forest to make way for their agricultural activities.

Organizers of the Singapore Grand Prix are monitoring the situation very closely and are working with the relevant agencies before any decision is taken.

“The possibility of haze is just one of the many potential issues that are covered in the overall 2015 Formula 1 Singapore Airlines Singapore Grand Prix Contingency Plan,” said a spokesperson for the Singapore GP.

“In the event that the haze causes visibility, public health or operational issues, Singapore GP will work closely with the relevant agencies before making any collective decisions regarding the event.”

The National Environment Agency (NEA) in Singapore says that the situation may worsen. An update at 19:00 Singapore time says that the “Pollutant Standards Index (PSI) was between 127-146, in the low to mid sections of the Unhealthy range”. The unhealthy range is 101-200.

In it’s update the NEA goes on to state that “the haze situation could deteriorate as the current unfavourable winds may blow in denser haze from Sumatra.”

“Thundery showers forecasted for Singapore in the late morning and early afternoon tomorrow may only bring a short temporary respite.

“The 24-hour PSI for the next 24 hours is expected to be in the mid to high sections of Unhealthy range, and may enter the low section of Very Unhealthy range if the unfavourable winds bring in denser haze from Sumatra.”