Protect pump attendants from toxic fumes

I have read about the harmful effects of inhaling petrol fumes and vehicle exhaust, so it surprises me that petrol pump attendants in Singapore do not seem to be sufficiently protected from these.

Due to the nature of the job, they are constantly exposed to both petrol fumes and exhaust from vehicles. Although it may seem like a small amount, the cumulative effect is something that may be a concern.

Are there any guidelines for the amount of exposure before it is considered hazardous?

Perhaps some personal safety requirements should be mandated to protect this group of workers, such as wearing a face mask, for example.

Siah Ge Beng