Tracking separate contributions of diesel and gasoline  vehicles to roadside PM<sub>2.5</sub> through online monitoring  of volatile organic compounds and PM<sub>2.5</sub> organic and  elemental carbon: a 6-year study in Hong Kong

Wong, Yee Ka; Huang, X. H. Hilda; Louie, Peter K. K.; Yu, Alfred L. C.; Chan, Damgy H. L.; Yu, Jian Zhen

doi:https://doi.org/10.5194/acp-20-9871-2020

Articles | Volume 20, issue 16

https://doi.org/10.5194/acp-20-9871-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-20-9871-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 20, issue 16

Research article

|

25 Aug 2020

Research article |

| 25 Aug 2020

Tracking separate contributions of diesel and gasoline vehicles to roadside PM_2.5 through online monitoring of volatile organic compounds and PM_2.5 organic and elemental carbon: a 6-year study in Hong Kong

Yee Ka Wong, X. H. Hilda Huang, Peter K. K. Louie, Alfred L. C. Yu, Damgy H. L. Chan, and Jian Zhen Yu

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Final revised paper (published on 25 Aug 2020)
Supplement to the final revised paper
Preprint (discussion started on 05 Mar 2020)
Supplement to the preprint

Interactive discussion

Status: closed

AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

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- Supplement

RC1: 'Wong et al. review', Anonymous Referee #2, 03 Apr 2020
- AC1: 'Response to review comments by Anonymous Referee #2', Jian Zhen Yu, 05 May 2020
RC2: 'Comments to acp-2020-9 by Wong et al.', Anonymous Referee #1, 24 May 2020
- AC2: 'Response to review comments by Anonymous Referee #1', Jian Zhen Yu, 19 Jun 2020

Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision

AR by Jian Zhen Yu on behalf of the Authors (19 Jun 2020) Author's response Manuscript

ED: Publish subject to minor revisions (review by editor) (10 Jul 2020) by Willy Maenhaut

The authors have reasonably well addressed the comments of the two anonymous referees and they have modified their manuscript accordingly. However, several alterations are needed for the Main text and Supplement before the manuscript can be published in ACP.

For the Main text:
Line 3: Replace "Compounds," by "Compounds and".
Line 26: Replace "of evidence-based" by "of an evidence-based".
Line 35: Replace "poses challenge" by "poses a challenge".
Lines 40, 48, 148, 221, 256, 361 and 365: Replace "e.g." by "e.g.,".
Line 64: Replace "2 h resolution" by "2-h-resolution".
Line 66: Replace "suit of" by "suite of".
Line 69: Replace "Here we" by "Here, we".
Line 80: Replace "effectiveness" by "the effectiveness".
Line 87: Replace "LPG respectively made" by "LPG made".
Line 88: Replace "29 % of" by "29 %, respectively, of".
Line 90: Replace "sources of" by "source of".
Line 93: Replace "concentrations data" by "concentration data".
Line 98: Replace "species including" by "species, including".
Line 100: Replace "exclude hourly" by "excluded hourly".
Line 102: Replace "are also" by "were also".
Line 109: Replace "Q value" by "Q-value".
Line 119: Replace "for non-roadside" by "for the non-roadside".
Line 151: Replace "Wu (2018)" by "Wu and Yu (2018)".
Line 161: Replace "air mass" by "air masses".
Line 163: Replace "into particle" by "into the particle".
Line 181: Replace "for holiday" by "for the holiday".
Line 185: Replace "Similar" by "A similar".
Line 190: Replace "is shown" by "are shown".
Line 196: Replace "was shown in" by "was observed in the".
Line 197: Replace "aerosol mass" by "the aerosol mass" and replace "two-thirds of" by "two-thirds of the".
Line 201: Replace "indicates that" by "indicate that".
Line 218: Replace "exhibit obvious" by "exhibit an obvious".
Line 223: Replace "air mass" by "air masses".
Line 225: Replace "colder" by "the colder" and replace "into particle" by "into the particle".
Line 254: Replace "show similar" by "show a similar".
Line 262: Replace "show that" by "shows that".
Line 264: Replace "in the all" by "in all".
Line 271: Replace "using box" by "using a box".
Line 289: Replace "its contribution" by "their contribution" and replace "to diesel" by "to that of diesel".
Line 298: Replace "reflects diesel" by "reflects the diesel".
Line 335: Replace "bus is" by "buses is".
Line 338: Replace "the trucks (i.e., DCVs) number is a factor of 2–3 higher than" by "the number of trucks (i.e., DCVs) is a factor of 2–3 higher than that of".
Line 339: Replace "vehicle" by "vehicles" and replace "than trucks" by "than the count of trucks".
Line 340: Replace "vehicle" by "vehicles".
Line 343: Replace "vehicle" by "vehicles".
Line 351: Replace "produce obvious" by "produce an obvious".
Line 519: Replace "on left" by "on the left".
Line 536: Replace "Vertical" by "The vertical".
Line 537: Replace "Green-shaded" by "The green-shaded".

For the Supplement:
Page S-1, line 1: Replace "Tracking" by "Supplementary Material for: Tracking".
Page S-1, line 2: Replace "Compounds," by "Compounds and".
Page S-1, line 6 above heading "S2. PMF Modeling Details": Replace "MDL" by "The MDL".
Page S-1, line 1 below heading "S2. PMF Modeling Details": Replace "MDL" by "the MDL".
Page S-1, line 3 below heading "S2. PMF Modeling Details": Replace "to EPA" by "to the EPA".
Page S-1, line 2 above heading "S3. PMF Uncertainty Analysis Results": Replace "concentration below" by "concentrations below the".
Page S-1, line 2 below heading "S3. PMF Uncertainty Analysis Results": Replace "each species" by "the species".
Page S-1, last line: Replace "Q value" by "Q-values".
Page S-2, line 1: Replace "Q value" by "Q-value" and replace "Q values" by "Q-values".
Page S-2, line 3: Replace "obtained is" by "obtained are".
Page S-2, line 13: Replace "Fig. S9a-c" by "Fig. S11a-c".
Page S-3, line 4 from bottom: Replace "47 mm" by "47-mm".
Page S-3, line 3 from bottom: Replace "2 h" by "2-h".
Page S-3, last line: Replace "1 h" by "1-h".
Page S-4, top line of the Table: Replace "recovery" by "recovery (%)".
Page S-4, last line: Replace "Note: No" by "Note: N/A indicates that no".
Page S-5, footnote of Table S3: Replace "Note: The" by "Note: The asterisk indicates that the".
Page S-9, line 2 of caption of Figure S7: Replace "factor number" by "factor numbers".
Page S-9, line 4 of caption of Figure S7: Replace "of 5-factor" by "of the 5-factor".
Page S-11, line 3 of caption of Figure S11: Replace "were split" by "was split".

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AR by Jian Zhen Yu on behalf of the Authors (11 Jul 2020) Author's response Manuscript

ED: Publish as is (21 Jul 2020) by Willy Maenhaut

AR by Jian Zhen Yu on behalf of the Authors (22 Jul 2020)

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Short summary

We present an approach to track separate contributions to PM_2.5 by gasoline and diesel vehicles through a positive matrix factorization analysis of online monitoring data measurable by relatively inexpensive analytical instruments. They are PM_2.5 organic and elemental carbon, C₂–C₉ volatile organic compounds, and nitrogen oxide concentrations. The method was demonstrated to be effective by applying monitoring data spanning 6 years (2011–2017) from a roadside environment in Hong Kong.

Tracking separate contributions of diesel and gasoline vehicles to roadside PM2.5 through online monitoring of volatile organic compounds and PM2.5 organic and elemental carbon: a 6-year study in Hong Kong

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Interactive discussion

Peer-review completion

Tracking separate contributions of diesel and gasoline vehicles to roadside PM_2.5 through online monitoring of volatile organic compounds and PM_2.5 organic and elemental carbon: a 6-year study in Hong Kong