1.   An operational System should be able to forecast, detect and react to dangerous pollution levels within a short period.

2.   Given that pollution levels relate to fuel consumption, private cars and taxis are also the greatest polluters.

3.   Pollution levels have fallen slightly.

4.   Pollution levels in some rivers are already dangerous.

5.   Pollution levels in the area shot up as soon as the factory started operating.

6.   Pollution levels in the water were found to be over the official limit.

7.   Tests were conducted to ascertain whether pollution levels have dropped.

8.   The aim is to reduce current pollution levels in the Black Sea.

9.   The alarming rate of increase in pollution levels has concerned environmentalists.

10.   The convention, signed by the six states bordering the Black Sea, aims to reduce current pollution levels.