Introduction to the special issue “In-depth study of air pollution sources and processes within Beijing and its surrounding region (APHH-Beijing)”
Authors: Shi Zongbo , Vu Tuan , Kotthaus Simone , Harrison Roy M. , Grimmond Sue , Yue Siyao , Zhu Tong , Lee James , Han Yiqun , Demuzere Matthias , Dunmore Rachel E. , Ren Lujie , Liu Di , Wang Yuanlin , Wild Oliver , Allan James , Acton W. Joe , Barlow Janet , Barratt Benjamin , Beddows David , Bloss William J. , Calzolai Giulia , Carruthers David , Carslaw David C. , Chan Queenie , Chatzidiakou Lia , Chen Yang , Crilley Leigh , Coe Hugh , Dai Tie , Doherty Ruth , Duan Fengkui , Fu Pingqing , Ge Baozhu , Ge Maofa , Guan Daobo , Hamilton Jacqueline F. , He Kebin , Heal Mathew , Heard Dwayne , Hewitt C. Nicholas , Hollaway Michael , Hu Min , Ji Dongsheng , Jiang Xujiang , Jones Rod , Kalberer Markus , Kelly Frank J. , Kramer Louisa , Langford Ben , Lin Chun , Lewis Alastair C. , Li Jie , Li Weijun , Liu Huan , Liu Junfeng , Loh Miranda , Lu Keding , Lucarelli Franco , Mann Graham , McFiggans Gordon , Miller Mark R. , Mills Graham , Monk Paul , Nemitz Eiko , O'Connor Fionna , Ouyang Bin , Palmer Paul I. , Percival Carl , Popoola Olalekan , Reeves Claire , Rickard Andrew R. , Shao Longyi , Shi Guangyu , Spracklen Dominick , Stevenson David , Sun Yele , Sun Zhiwei , Tao Shu , Tong Shengrui , Wang Qingqing , Wang Wenhua , Wang Xinming , Wang Xuejun , Wang Zifang , Wei Lianfang , Whalley Lisa , Wu Xuefang , Wu Zhijun , Xie Pinhua , Yang Fumo , Zhang Qiang , Zhang Yanli , Zhang Yuanhang , Zheng Mei 
Published: June 2019

Abstract. The Atmospheric Pollution and Human Health in a Chinese
Megacity (APHH-Beijing) programme is an international collaborative project
focusing on understanding the sources, processes and health effects of air
pollution in the Beijing megacity. APHH-Beijing brings together leading China
and UK research groups, state-of-the-art infrastructure and air quality
models to work on four research themes: (1) sources and emissions of air
pollutants; (2) atmospheric processes affecting urban air pollution; (3) air
pollution exposure and health impacts; and (4) interventions and solutions.
Themes 1 and 2 are closely integrated and support Theme 3, while Themes 1–3
provide scientific data for Theme 4 to develop cost-effective air pollution
mitigation solutions. This paper provides an introduction to (i) the
rationale of the APHH-Beijing programme and (ii) the measurement and
modelling activities performed as part of it. In addition, this paper
introduces the meteorology and air quality conditions during two joint
intensive field campaigns – a core integration activity in APHH-Beijing. The
coordinated campaigns provided observations of the atmospheric chemistry and
physics at two sites: (i) the Institute of Atmospheric Physics in central
Beijing and (ii) Pinggu in rural Beijing during 10 November–10 December 2016 (winter) and 21 May–22 June 2017 (summer). The campaigns were
complemented by numerical modelling and automatic air quality and low-cost
sensor observations in the Beijing megacity. In summary, the paper provides
background information on the APHH-Beijing programme and sets the scene for
more focused papers addressing specific aspects, processes and effects of
air pollution in Beijing.