Articles | Volume 20, issue 8
Atmos. Chem. Phys., 20, 5019–5033, 2020
https://doi.org/10.5194/acp-20-5019-2020

Special issue: Multiphase chemistry of secondary aerosol formation under...

Atmos. Chem. Phys., 20, 5019–5033, 2020
https://doi.org/10.5194/acp-20-5019-2020

Research article 28 Apr 2020

Research article | 28 Apr 2020

Nitrate-dominated PM2.5 and elevation of particle pH observed in urban Beijing during the winter of 2017

Yuning Xie et al.

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Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision
AR by Anna Wenzel on behalf of the Authors (14 Jan 2020)  Author's response
ED: Referee Nomination & Report Request started (18 Jan 2020) by Jingkun Jiang
RR by Anonymous Referee #3 (30 Jan 2020)
RR by Anonymous Referee #2 (13 Feb 2020)
ED: Reconsider after major revisions (15 Feb 2020) by Jingkun Jiang
AR by Anna Wenzel on behalf of the Authors (26 Mar 2020)  Author's response
ED: Referee Nomination & Report Request started (27 Mar 2020) by Jingkun Jiang
RR by Anonymous Referee #3 (27 Mar 2020)
ED: Publish as is (28 Mar 2020) by Jingkun Jiang
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Short summary
As a result of strict emission control, nitrate-dominated PM2.5 in pollution episodes was observed in urban Beijing during the winter of 2017–2018. With the help of sufficient ammonia, particle pH could increase to near neutral (5.4) as particulate nitrate fraction increases. Further tests imply that airborne particle hygroscopicity would be enhanced at moderate RH in nitrate-dominated particles, and pH elevation will be accelerated when ammonia and particulate nitrate both increase.
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