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Quality assurance (QA) processes are necessary to ensure that the environment of controlled environment facilities is known, is accurately measured, and the resulting data is valid. These QA procedures for plant growth facilities are based on the published ASAE Engineering Practice ANSI/ASAE EP411.4, Guidelines for measuring and reporting environmental parameters for plant experiments in growth chambers. The ISO9001:2000 Quality Assurance System procedures apply to the environmental parameters contained in EP 411.4, the calibration of the sensors and instruments, the characteristics of the acquisition and control systems, and the records necessary to validate the resulting data. Specific quality assurance procedures for parameters of the aerial environment of plant growth facilities are provided. Further development of procedures and guidelines to standardize and assure the quality of the environmental measurement of plant growth facilities is required. The comments or suggested revisions of the procedures proposed are solicited from the community of engineers and scientists involved in design, operation and use of plant growth facilities.