It is the purpose of this chapter to provide additional and cumulative remedies to abate the pollution of the air and waters of the State and nothing herein contained shall abridge or alter rights of action in the civil courts or remedies existing in equity or under the common law or statutory law, nor shall any provision in this chapter or any act done by virtue of this chapter be construed as estopping the State, persons or municipalities, as riparian owners or otherwise, in the exercise of their rights under the common law, statutory law or in equity to suppress nuisances or to abate any pollution.