Variations and sources of nitrous acid (HONO) during a severe pollution episode in Beijing in winter 2016

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Variations and sources of nitrous acid (HONO) during a severe pollution episode in Beijing in winter 2016. / Zhang, Wenqian; Tong, Shengrui; Ge, Maofa; An, Junling; Shi, Zongbo; Hou, Siqi; Xia, Kaihui; Qu, Yu; Zhang, Hongxing; Chu, Biwu; Sun, Yele; He, Hong.

In: Science of the Total Environment, Vol. 648, 15.01.2019, p. 253-262.

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Zhang, Wenqian ; Tong, Shengrui ; Ge, Maofa ; An, Junling ; Shi, Zongbo ; Hou, Siqi ; Xia, Kaihui ; Qu, Yu ; Zhang, Hongxing ; Chu, Biwu ; Sun, Yele ; He, Hong. / Variations and sources of nitrous acid (HONO) during a severe pollution episode in Beijing in winter 2016. In: Science of the Total Environment. 2019 ; Vol. 648. pp. 253-262.

Bibtex

@article{5078399e3529444383054c530ed58730,
title = "Variations and sources of nitrous acid (HONO) during a severe pollution episode in Beijing in winter 2016",
abstract = "HONO is an important precursor of OH radical and plays a key role in atmospheric chemistry, but its source and formation mechanism remain uncertain, especially during complex atmospheric pollution processes. In this study, HONO mixing ratios were measured by a custom-made instrument during a severe pollution event from 16 to 23 December 2016, at an urban area of Beijing. The measurement was divided into three periods: I (haze), II (severe haze) and III (clean), according to the levels of PM2.5. This pollution episode was characterized by high levels of NO (75 ± 39 and 94 ± 40 ppbV during periods I and II, respectively) and HONO (up to 10.7 ppbV). During the nighttime, the average heterogeneous conversion frequency during the two haze periods were estimated to be 0.0058 and 0.0146 h-1, and it was not the important way to form HONO. Vehicle emissions contributed 52% (± 16)% and 40% (± 18)% to ambient HONO at nighttime during periods I and II. The contribution of homogeneous reaction of NO with OH should be reconsidered under high-NOx conditions and could be noticeable to HONO sources during this pollution event. Furthermore, HONO was positively correlated with PM2.5 during periods I and II, suggesting a potential chemical link between HONO and haze particles.",
keywords = "Daytime HONO budget, Haze, Homogeneous reaction, Nitrous acid measurement, Vehicle emissions",
author = "Wenqian Zhang and Shengrui Tong and Maofa Ge and Junling An and Zongbo Shi and Siqi Hou and Kaihui Xia and Yu Qu and Hongxing Zhang and Biwu Chu and Yele Sun and Hong He",
year = "2019",
month = jan,
day = "15",
doi = "10.1016/j.scitotenv.2018.08.133",
language = "English",
volume = "648",
pages = "253--262",
journal = "Science of the Total Environment",
issn = "0048-9697",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Variations and sources of nitrous acid (HONO) during a severe pollution episode in Beijing in winter 2016

AU - Zhang, Wenqian

AU - Tong, Shengrui

AU - Ge, Maofa

AU - An, Junling

AU - Shi, Zongbo

AU - Hou, Siqi

AU - Xia, Kaihui

AU - Qu, Yu

AU - Zhang, Hongxing

AU - Chu, Biwu

AU - Sun, Yele

AU - He, Hong

PY - 2019/1/15

Y1 - 2019/1/15

N2 - HONO is an important precursor of OH radical and plays a key role in atmospheric chemistry, but its source and formation mechanism remain uncertain, especially during complex atmospheric pollution processes. In this study, HONO mixing ratios were measured by a custom-made instrument during a severe pollution event from 16 to 23 December 2016, at an urban area of Beijing. The measurement was divided into three periods: I (haze), II (severe haze) and III (clean), according to the levels of PM2.5. This pollution episode was characterized by high levels of NO (75 ± 39 and 94 ± 40 ppbV during periods I and II, respectively) and HONO (up to 10.7 ppbV). During the nighttime, the average heterogeneous conversion frequency during the two haze periods were estimated to be 0.0058 and 0.0146 h-1, and it was not the important way to form HONO. Vehicle emissions contributed 52% (± 16)% and 40% (± 18)% to ambient HONO at nighttime during periods I and II. The contribution of homogeneous reaction of NO with OH should be reconsidered under high-NOx conditions and could be noticeable to HONO sources during this pollution event. Furthermore, HONO was positively correlated with PM2.5 during periods I and II, suggesting a potential chemical link between HONO and haze particles.

AB - HONO is an important precursor of OH radical and plays a key role in atmospheric chemistry, but its source and formation mechanism remain uncertain, especially during complex atmospheric pollution processes. In this study, HONO mixing ratios were measured by a custom-made instrument during a severe pollution event from 16 to 23 December 2016, at an urban area of Beijing. The measurement was divided into three periods: I (haze), II (severe haze) and III (clean), according to the levels of PM2.5. This pollution episode was characterized by high levels of NO (75 ± 39 and 94 ± 40 ppbV during periods I and II, respectively) and HONO (up to 10.7 ppbV). During the nighttime, the average heterogeneous conversion frequency during the two haze periods were estimated to be 0.0058 and 0.0146 h-1, and it was not the important way to form HONO. Vehicle emissions contributed 52% (± 16)% and 40% (± 18)% to ambient HONO at nighttime during periods I and II. The contribution of homogeneous reaction of NO with OH should be reconsidered under high-NOx conditions and could be noticeable to HONO sources during this pollution event. Furthermore, HONO was positively correlated with PM2.5 during periods I and II, suggesting a potential chemical link between HONO and haze particles.

KW - Daytime HONO budget

KW - Haze

KW - Homogeneous reaction

KW - Nitrous acid measurement

KW - Vehicle emissions

UR - http://www.scopus.com/inward/record.url?scp=85051569200&partnerID=8YFLogxK

U2 - 10.1016/j.scitotenv.2018.08.133

DO - 10.1016/j.scitotenv.2018.08.133

M3 - Article

VL - 648

SP - 253

EP - 262

JO - Science of the Total Environment

JF - Science of the Total Environment

SN - 0048-9697

ER -