ESS provided verbiage, editing and consulting services related to the promulgation of Ministry of Natural Resources and Environment circulars 24/2017/TT-BTNMT and 31/2016/TT-BTNMT. These circulars/ regulations further delineated the environmental measurement techniques and rules for verifying and certifying continuous emission monitoring system (CEMS) within Viet Nam. We directly supported the CEM (operated under the VEA) for this task.