Publisher Summary An environmental audit is a systematic, documented, periodic, and objective evaluation of how well environmental organization, management, and equipment are performing. Monitoring of emissions, discharges and disposals is a prerequisite of control. Depending upon the waste stream, sampling and analysis may be continuous or periodic. Measurement methods for physico-chemical properties and chemical analysis of waste streams are very diverse. The basic database for the control of environmental pollution is a pollution inventory—that is, a tabulation of emissions, discharges and wastes from the factory or activity covering all operating phases. This includes atmospheric emissions, aqueous discharges, solid wastes, noise, and transport.