<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Shang, D.</style></author><author><style face="normal" font="default" size="100%">Peng, J.</style></author><author><style face="normal" font="default" size="100%">Guo, S.</style></author><author><style face="normal" font="default" size="100%">Wu, Z.</style></author><author><style face="normal" font="default" size="100%">Hu, M.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Secondary aerosol formation in winter haze over the Beijing-Tianjin-Hebei Region, China</style></title><secondary-title><style face="normal" font="default" size="100%">Frontiers of Environmental Science and EngineeringFrontiers of Environmental Science and EngineeringFrontiers of Environmental Science and Engineering</style></secondary-title><alt-title><style face="normal" font="default" size="100%">Front. Environ. Sci. Eng.</style></alt-title><short-title><style face="normal" font="default" size="100%">Front. Environ. Sci. Eng.Front. Environ. Sci. Eng.</style></short-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Aerosol chemistry</style></keyword><keyword><style  face="normal" font="default" size="100%">aerosols</style></keyword><keyword><style  face="normal" font="default" size="100%">air quality</style></keyword><keyword><style  face="normal" font="default" size="100%">Aqueous reaction</style></keyword><keyword><style  face="normal" font="default" size="100%">Beijing-tianjin-hebei regions</style></keyword><keyword><style  face="normal" font="default" size="100%">chemical mechanism</style></keyword><keyword><style  face="normal" font="default" size="100%">Chemical reactions</style></keyword><keyword><style  face="normal" font="default" size="100%">Chinese Government</style></keyword><keyword><style  face="normal" font="default" size="100%">gas-phase reactions</style></keyword><keyword><style  face="normal" font="default" size="100%">heterogeneous reactions</style></keyword><keyword><style  face="normal" font="default" size="100%">Particle pollution</style></keyword><keyword><style  face="normal" font="default" size="100%">Phase interfaces</style></keyword><keyword><style  face="normal" font="default" size="100%">Photochemical reaction</style></keyword><keyword><style  face="normal" font="default" size="100%">PM2.5 concentration</style></keyword><keyword><style  face="normal" font="default" size="100%">Pollution control</style></keyword><keyword><style  face="normal" font="default" size="100%">Regional haze</style></keyword><keyword><style  face="normal" font="default" size="100%">secondary aerosol formation</style></keyword><keyword><style  face="normal" font="default" size="100%">secondary aerosols</style></keyword><keyword><style  face="normal" font="default" size="100%">Sulfur compounds</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2021</style></year></dates><number><style face="normal" font="default" size="100%">2</style></number><publisher><style face="normal" font="default" size="100%">Higher Education Press Limited Company</style></publisher><volume><style face="normal" font="default" size="100%">15</style></volume><isbn><style face="normal" font="default" size="100%">20952201 (ISSN)</style></isbn><language><style face="normal" font="default" size="100%">English</style></language><abstract><style face="normal" font="default" size="100%">Severe haze pollution occurs frequently in the winter over the Beijing-Tianjin-Hebei (BTH) region (China), exerting profound impacts on air quality, visibility, and human health. The Chinese Government has taken strict mitigation actions since 2013 and has achieved a significant reduction in the annual mean PM2.5 concentration over this region. However, the level of secondary aerosols during heavy haze episodes showed little decrease during this period. During heavy haze episodes, the concentrations of secondary aerosol components, including sulfate, nitrate and secondary organics, in aerosol particles increase sharply, acting as the main contributors to aerosol pollution. To achieve effective control of particle pollution in the BTH region, the precise and complete secondary aerosol formation mechanisms have been investigated, and advances have been made about the mechanisms of gas phase reaction, nucleation and heterogeneous reactions in forming secondary aerosols. This paper reviews the research progress in aerosol chemistry during haze pollution episodes in the BTH region, lays out the challenges in haze formation studies, and provides implications and directions for future research. [Figure not available: see fulltext.]. © 2020, Higher Education Press.</style></abstract><work-type><style face="normal" font="default" size="100%">Review</style></work-type><notes><style face="normal" font="default" size="100%">Export Date: 29 December 2020通讯地址: Hu, M.; State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking UniversityChina; 电子邮件: minhu@pku.edu.cn</style></notes><custom7><style face="normal" font="default" size="100%">34</style></custom7><auth-address><style face="normal" font="default" size="100%">State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, ChinaDepartment of Atmospheric Sciences, Texas A&amp;amp;M University, College Station, TX 77843, United StatesBeijing Innovation Center for Engineering Sciences and Advanced Technology, Peking University, Beijing, 100871, China</style></auth-address><remote-database-name><style face="normal" font="default" size="100%">Scopus</style></remote-database-name></record></records></xml>