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In order to examine the influence of high concentrations of anthropogenic pollutants on isoprene-derived SOA (SOA\n                    <jats:sub>\n                      <jats:italic>i<\/jats:italic>\n                    <\/jats:sub>\n                    ) formation, summertime PM\n                    <jats:sub>2.5<\/jats:sub>\n                    filter samples were collected with a three-hour sampling interval at a rural site in the North China Plain (NCP), and determined for SOA\n                    <jats:sub>\n                      <jats:italic>i<\/jats:italic>\n                    <\/jats:sub>\n                    tracers and other chemical species. RO\n                    <jats:sub>2<\/jats:sub>\n                    +NO pathway derived 2-methylglyceric acid presented a relatively higher contribution to the SOA\n                    <jats:sub>\n                      <jats:italic>i<\/jats:italic>\n                    <\/jats:sub>\n                    due to the high-NOx (~20\u2009ppb) conditions in the NCP that suppressed the reactive uptake of RO\n                    <jats:sub>2<\/jats:sub>\n                    +HO\n                    <jats:sub>2<\/jats:sub>\n                    reaction derived isoprene epoxydiols. Compared to particle acidity and water content, sulfate plays a dominant role in the heterogeneous formation process of SOA\n                    <jats:sub>\n                      <jats:italic>i<\/jats:italic>\n                    <\/jats:sub>\n                    . Diurnal variation and correlation of 2-methyltetrols with ozone suggested an important effect of isoprene ozonolysis on SOA\n                    <jats:sub>\n                      <jats:italic>i<\/jats:italic>\n                    <\/jats:sub>\n                    formation. SOA\n                    <jats:sub>\n                      <jats:italic>i<\/jats:italic>\n                    <\/jats:sub>\n                    increased linearly with levoglucosan during June 10\u201318, which can be attributed to an increasing emission of isoprene caused by the field burning of wheat straw and a favorable aqueous SOA formation during the aging process of the biomass burning plume. Our results suggested that isoprene oxidation is highly influenced by intensive anthropogenic activities in the NCP.\n                  <\/jats:p>","DOI":"10.1038\/s41598-017-18983-7","type":"journal-article","created":{"date-parts":[[2018,1,5]],"date-time":"2018-01-05T10:42:23Z","timestamp":1515148943000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":53,"title":["Characterization of isoprene-derived secondary organic aerosols at a rural site in North China Plain with implications for anthropogenic pollution effects"],"prefix":"10.1038","volume":"8","author":[{"given":"Jianjun","family":"Li","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gehui","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Can","family":"Wu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cong","family":"Cao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yanqin","family":"Ren","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiayuan","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jin","family":"Li","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Junji","family":"Cao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Limin","family":"Zeng","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tong","family":"Zhu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2018,1,11]]},"reference":[{"key":"18983_CR1","doi-asserted-by":"publisher","first-page":"5155","DOI":"10.5194\/acp-9-5155-2009","volume":"9","author":"M Hallquist","year":"2009","unstructured":"Hallquist, M. et al. 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