11.   This brings noise from the busiest roads to an acceptable level.

12.   This determines how much money, time and effort should be spent to bring them to acceptable levels.

13.   Audio compression can also be achieved by identifying acceptable levels of redundancy and stripping them out.

14.   Britain prefers absolute standards, which would exclude all products that failed to come up to the minimum acceptable level.

15.   Its assessment is based on a much higher acceptable level of nutrients.

16.   People living in the areas had been exposed to three times the acceptable level of ionising radiation.

17.   Greenpeace says the problems bring the margin of safety below an acceptable level and calls for the immediate closure of the affected reactors.

18.   The most efficient plant tested on soils polluted by heavy metals from London sewage, alpine pennycress, reduced zine to acceptable levels after nine croppings.

19.   A large quantity of information is needed in order to reduce this uncertainty to an acceptable level.

20.   Better monitoring should reduce poaching and smuggling to acceptable levels, allowing legal trade to proceed without stimulating the illegal sort.