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. 2017 Nov 17;7:15760. doi: 10.1038/s41598-017-15909-1

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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The variability of measured CO and aerosol composition (SO₄ ²⁻, NO₃ ⁻, NH₄ ⁺, Organics) under different RH conditions during 2012–2013 winter time in Beijing. As RH increased to a critical value (50%), the CO, which can be considered as an inactive-chemical tracer, remained at a relatively constant value. The secondary aerosols (NO₃ ⁻, SO₄ ²⁻, NH₄ ⁺), however, showed a rapid increase with the increase in RH values. The organic aerosol (Org) contained both secondary and primary component, resulting in a mixed behaviour between the CO and secondary aerosols.