Media type: E-Article Title: RETRACTED ARTICLE: Ambient air quality prediction and unbounded variational continuous function based on big data Contributor: An, Hongwei; Zheng, Lifang imprint: Springer Science and Business Media LLC, 2021 Published in: Arabian Journal of Geosciences Language: English DOI: 10.1007/s12517-021-08072-5 ISSN: 1866-7538; 1866-7511 Keywords: General Earth and Planetary Sciences ; General Environmental Science Origination: Footnote: