## 6 Discussion  
The proposed system can reduce the moral hazard while updating information, because the blockchain \"process black box\" works in all processes. Moreover, participants who read the recorded data can solve the information imbalance problem using a distributed ledger to minimize the reverifying task of validating the information's reliability. As a result of this process and output, participants who read data, such as inspection agencies and civic groups, can use reliable data to determine the fine dust concentration, breach concentration limits, and implement measures in order to reduce the concentration of fine dust. Therefore, it is possible to form a trust protocol among the contractor, who reduces fine dust at construction sites; the inspection agency, who monitors the concentration of fine dust; and the public, who are curious about information regarding fine dust being produced at construction sites near their homes. A private blockchain platform was established to classify the authority to access the blockchain network based on the participants. The platform utilizes \"Hyperledger Fabric,\" which has a multi-channel function. It can manage multiple distributed ledgers; thus, it can easily manage various construction sites. For the use of the multi-channel, the inspection agency participates in the channel of a city or town, the contractor participates in the channel of construction sites that are self-managed, and the civic group selectively participates in the channel of construction sites near the residential area. Therefore, it is possible to easily create and view information by participating as a peer in the blockchain network.  
Consequently, residents near construction sites are guaranteed access to fine dust management information. In addition, civil complaints can be reduced by using transparent and reliable information. Moreover, inspection agencies will implement policies to improve the quality of public life by calculating dust emission charges and deploying fine dust management teams. Additionally, contractors can gain a reputation and enhance their management skills by improving their autonomous and transparent environmental management capabilities. This can be an advantage when applying the preliminary qualification system for bid qualifications and compensation to extend construction periods [37].  
\begin{table}
\begin{tabular}{c c c c} \hline \hline  & **Evaluation** & **Current System** & **Suggestion System** \\ \hline \multirow{3}{*}{Reliability and Accessibility} & Decentralization & Low & High \\  & Security & Normal & High \\  & Reliability & Normal & High \\  & Trust & Normal & High \\  & Transparency & Low & High \\ \hline \multirow{2}{*}{Efficiency} & Automation & Normal & High \\  & Scalability & Normal & High \\ \hline \hline \end{tabular}
\end{table}
Table 4: Qualitative evaluation.  
\begin{table}
\begin{tabular}{c c c} \hline \hline
**Classification** & **Current System** & **Suggestion System** \\ \hline Input fine dust concentration & & manually & manually \\   regulation & & less than 1 s & less than 1 s \\   IoT data transmission & & less than 1 s & 0.7 s \\   Time to determine excess & & & \\   fine dust concentration & & & \\   Time to send dust reduction alarm & manually & 5.3 s (automatically) \\   Inspection time & visit construction site & 9.6 s (upload picture) \\   Forgery check & none & & 7.2 s (HMac, automatically) \\   Monitoring service & only government & & all participants \\  & inspection agency & & \\ \hline \hline \end{tabular}
\end{table}
Table 3: Comparison of the work processes.