National Environmental Standards Compendium (NESC)
 NESC is a collection of various standards prepared at different times. The NESC is divided into three parts:

Part 1 comprises of standards that require compulsory compliance. Compulsory standards are further categorized as generic or specific.

Part 2 covers those standards that may be implemented on voluntary basis. These includes guidelines standards, codes of practice and others.

 Part 3 covers the requisite test methods that should be followed when testing for compliance. The test methods included are referred to in at least one of the specification standards appearing under part 1.

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