If you do cause serious pollution you may have to pay to remedy the damage.

The river suffered from serious domestic pollution until 1998.

The lack of serious pollution in the area contributes to the remarkable clearness.

More recently, there has been criticism that most of what is burnt causes serious environmental pollution.

Doing so can lead to serious pollution of the receiving water.

There have been accidents during transportation, which have caused serious pollution.

Mismanagement caused serious environmental pollution and the hotel had to be dismantled in 2002.

"We found the most serious pollution I have ever seen over primary forest," he said.

The industrial development of the lower banks led to serious pollution of the creek in the 20th century.

Once again, there is cause for concern at the serious pollution affecting the fourth most important wetland in Europe.