Singapore: Haze could loom over the coming Formula 1 Singapore Grand Prix as the Pollutant Standards Index (PSI) for the city state is hitting the range of “unhealthy” air quality over the past a few days, local media reported on Monday.

Singapore’s National Environment Agency said that PSI levels were expected to remain in that range this week, and many Formula 1 fans were worried about the impact that haze could impose on the event, reports Xinhua.

Opinions varied among fans in Singapore. Some have decided to be seated in the pit to watch the race with proper precautions as they thought it’s a special opportunity, while some said they will wait to see how the haze situation develops before deciding on their next course of action.

Race promoters Singapore GP previously said haze was one of the “potential issues” covered in its contingency plan. Singapore GP said it would work closely with the relevant agencies before making any collective decisions regarding the event, as haze may cause visibility, public health or operational issues.

Haze also affected the race last year, with the three-hour PSI hitting an unhealthy level in the middle of the race.