The construction industry alone produced approximately 1.7% of total U.S. greenhouse gas (GHG) emissions in 2002. This is equivalent to 6 percent of the total U.S. industrial-related greenhouse gas emissions. GHG emissions from construction equipments on project sites are highly variable. Standardized method with accuracy and reliability is needed for measuring the GHG emissions from construction equipments. Thus, to comprehend this variation fully and the GHG commodity each construction sites, web-based GHG emissions monitoring system that uses the ZigBee wireless sensors operated by ambient power harvesting for measuring conveniently is needed. According to the results, consuming allocations of each project sites are analyzed. And based on the amount of GHG emissions measured like electricity rates, authorized institute is trading greenhouse gas, regarding the redundant and surplus allocations rates, between project sites. This system would be possible to systematically manage the greenhouse gas and to reduce it eventually. This paper represents the system architecture concept and process for this research.