What type of respiratory protection is required when spraying solvent-based traffic paints in outdoor locations with limited natural air movement?

1. Simple paper nuisance dust mask with a single rubber strap.
2. Loose cloth surgical face mask tied around the back of the head only.
3. Half-mask elastomeric respirator with organic vapor (OV) cartridges.
4. No respirator is needed if the worker wears dark sunglasses.