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Gaseous emissions of volatile organic compounds and nitrogen oxides from urban transportation and sulfur dioxide from regional industry are responsible for large secondary PM formation, while primary emissions and regional transport of PM are insignificant. Reductions in emissions of the aerosol precursor gases from transportation and industry are essential to mediate severe haze pollution in China.<\/jats:p>","DOI":"10.1073\/pnas.1419604111","type":"journal-article","created":{"date-parts":[[2014,11,24]],"date-time":"2014-11-24T23:48:51Z","timestamp":1416872931000},"page":"17373-17378","update-policy":"https:\/\/doi.org\/10.1073\/pnas.cm10313","source":"Crossref","is-referenced-by-count":1460,"title":["Elucidating severe urban haze formation in China"],"prefix":"10.1073","volume":"111","author":[{"given":"Song","family":"Guo","sequence":"first","affiliation":[{"name":"State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China;"},{"name":"Departments of Atmospheric Sciences and Chemistry, Center for the Atmospheric Chemistry and the Environment, Texas A&amp;M University, College Station, TX 77843; and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Min","family":"Hu","sequence":"additional","affiliation":[{"name":"State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Misti L.","family":"Zamora","sequence":"additional","affiliation":[{"name":"Departments of Atmospheric Sciences and Chemistry, Center for the Atmospheric Chemistry and the Environment, Texas A&amp;M University, College Station, TX 77843; and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jianfei","family":"Peng","sequence":"additional","affiliation":[{"name":"State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dongjie","family":"Shang","sequence":"additional","affiliation":[{"name":"State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jing","family":"Zheng","sequence":"additional","affiliation":[{"name":"State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhuofei","family":"Du","sequence":"additional","affiliation":[{"name":"State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhijun","family":"Wu","sequence":"additional","affiliation":[{"name":"State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Min","family":"Shao","sequence":"additional","affiliation":[{"name":"State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Limin","family":"Zeng","sequence":"additional","affiliation":[{"name":"State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mario J.","family":"Molina","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Renyi","family":"Zhang","sequence":"additional","affiliation":[{"name":"State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China;"},{"name":"Departments of Atmospheric Sciences and Chemistry, Center for the Atmospheric Chemistry and the Environment, Texas A&amp;M University, College Station, TX 77843; and"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"341","published-online":{"date-parts":[[2014,11,24]]},"reference":[{"key":"e_1_3_3_1_2","volume-title":"Intergovernmental Panel on Climate Change. 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