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Review comment on “Novel index to comprehensively evaluate air cleanness: the "Clean aIr Index"” by Tomohiro O. Sato et al.

In this manuscript, authors focused on their original index to evaluate air cleanness, named as CII. CII is defined as the difference from unity of the sum of relative cleanness of each pollutant (NO2, SO2, SPM and O3) normalized by each standard. This study is positioned as a basic research of their novel index and a demonstration for indicating reasonability and utility of the index. Such an index may be useful for capturing and understanding simply the air cleanness. Thus, the reviewer believes that this work has an important implication and is significant enough to be published in this journal. However, the present manuscript leaves several points to be improved, clarified, modified, and/or reconstructed, in order for readers to understand descriptions and to recognize the significance of this study clearly. Especially, it is necessary to