Does Light Pollution Affect Nighttime Ground-Level Ozone Concentrations?
, Nor Azam Ramli 1, Norrimi Rosaida Awang 2, Mohd Rodzi Ismail 3,*, Mohd Talib Latif 4 and Nazatul Syadia Zainordin 5Round 1
Reviewer 1 Report
In this manuscript, the authors present nighttime ground level O3, NO and NO2 concentrations observed in urban and sub-urban sites of Malaysia for three years. The results revel the possible relationship between nighttime light pollution and ground level O3 variations. The present results are very interesting in the atmospheric chemistry. However, there are some key issues that should be addressed before publication.
Comments:
1. I see the details of data monitoring instruments, monitoring periods and total duration in Table 2 but it is not discussed in the manuscript text. I suggest authors should provide the details on how the data collected in this work.
2. Authors should provide details on how the data was used and applied in the study? It is more important for readers to follow and deep understanding of the present work.
3. Line 169-172: Authors mentioned that “Even though the values were not high, the O3 concentrations should be at zero during nighttime because of the absence of sunlight. This is due to the decreased hydroxyl radical (as they are produced mainly OH) concentrations…. I think authors should mention the concentrations of OH radicals in nighttime (Atmos. Sci. Let. 2008, 9, 140–146) and daytime (J. Phys. Chem. A 2017, 121, 8465-8473), and discuss this point in more detail in the revised manuscript with references.
4. Table 3: The daytime and nighttime concentrations of O3, NO, and NO2 at different sites for the year 2015 is not visible/not provided. I suggest the authors to correct the table with all the required information.
5. In figure 2 and 3, use different colors to show the hourly diurnal plots of O3, NO, NO2 lines to be more differentiated from one other which leads the readers can easily follow the figures.
6. In figure 4, please show with different colors for each line in JNO2/k3 diurnal plots at urban and suburban sites in 2013, 2014 and 2015.
Author Response
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Reviewer 2 Report
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Round 2
Reviewer 2 Report
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