This river is polluted with sewage sludge.

The pollution in this area has become a serious problem.

We often have picnics by the river on weekends.

We often have picnics by the river on weekends.

We have a picnic by the river every weekend.

The air in this area is greatly affected by pollutants emitted from factories.

This polluted water could potentially harm our health.

Soil pollution in this area has become serious due to years of industrial activity.

Air pollution is having a serious impact on the health of the planet.

Chemical pollution has a serious impact on the health of the Earth.