Fig. 2 | Scientific Data

Fig. 2

From: A geospatial dataset of PFOS and PFOA occurrence records in China’s multi-media environments (2021–2024)

Fig. 2

Publication trend and data extraction summary for literature on PFOS and PFOA in China (2004–2025). The blue bars represent the total number of publications retrieved from Web of Science and CNKI databases prior to screening, illustrating the long-term research trend. The orange bars indicate the number of publications from 2021–2025 that met our inclusion criteria after screening. The red line shows the number of individual data records extracted from these screened publications for inclusion in our final dataset.

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