Air quality in the eastern United States and Eastern Canada for 1990–2015: 25 years of change in response to emission reductions of SO2 and NOx in the region

Feng, Jian; Chan, Elton; Vet, Robert

doi:https://doi.org/10.5194/acp-20-3107-2020

Articles | Volume 20, issue 5

https://doi.org/10.5194/acp-20-3107-2020

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

https://doi.org/10.5194/acp-20-3107-2020

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

Articles | Volume 20, issue 5

Research article

|

16 Mar 2020

Research article |

| 16 Mar 2020

Air quality in the eastern United States and Eastern Canada for 1990–2015: 25 years of change in response to emission reductions of SO₂ and NO_x in the region

Jian Feng, Elton Chan, and Robert Vet

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Final revised paper (published on 16 Mar 2020)
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Preprint (discussion started on 15 Aug 2019)
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Interactive discussion

Status: closed

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

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RC1: 'Comments', Tom Butler, 13 Sep 2019
- AC2: 'Reply to the comments and suggestions of reviewer #2', Jian Feng, 04 Dec 2019
RC2: 'review on acp-2019-567', Anonymous Referee #1, 24 Oct 2019
- AC1: 'Reply to the comments and suggestions of reviewer #1', Jian Feng, 04 Dec 2019

Peer-review completion

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

AR by Anna Wenzel on behalf of the Authors (13 Jan 2020) Author's response

ED: Referee Nomination & Report Request started (14 Jan 2020) by Veli-Matti Kerminen

RR by Tom Butler (24 Jan 2020)

RR by Anonymous Referee #1 (02 Feb 2020)

ED: Publish subject to minor revisions (review by editor) (03 Feb 2020) by Veli-Matti Kerminen

AR by Jian Feng on behalf of the Authors (06 Feb 2020) Author's response Manuscript

ED: Publish as is (11 Feb 2020) by Veli-Matti Kerminen

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Short summary

In this study, we analyzed air concentration data on SO₄^2-, NO₃^-, NH₄⁺, HNO₃, and SO₂ measured by CASTNET in the US and by CAPMoN in Canada to reveal the temporal and spatial trends of air pollutants over the eastern US and Eastern Canada. We also explained (1) why the reductions of SO₂ were faster than SO₄^2- and (2) why NO₃^- did not decrease during the cold season except in the Midwest and southern Ontario despite NO_x emissions being significantly reduced for the whole region.