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. 2019 Aug 7;9:11479. doi: 10.1038/s41598-019-47870-6

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© The Author(s) 2019

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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Annual airborne pollen counts x_i(t) for 120 sites from 2003 to 2016. (a) The time series expressions of x_i(t) for 120 sites in eight regions. Red lines indicate the mean value in each region. (b) Time–space diagrams of x_i(t) in each term [t − t + 1]. Orange: increased state, Blue: decreased state, Green: unchanged state, White: no data.