11.   Vehicles in the areas will be required to use lead-free gasoline, and all industries which emit smoke should get clearance before they can start operation.

12.   When our vehicles start to emit black smoke, it is time to have the engine checked and repaired.

13.   The tires were burnt illegally and emitted poisonous smoke, while Bretzing was jailed in Germany last August on suspicion of illegally storing hazardous waste, Hamdan said.