The F-EIR Conference 2021 - Environment Concerns and its Remediation was held on 18-22 October in Chandigarh, India. The event was aimed to bring research professionals from multi-disciplinary fields to cross established sub-disciplinary divides, encouraging the exchange of ideas between scientists, engineering professionals, architects, environmental scientists, academicians, economists, and students. The conference focussed on the most interesting and relevant critical thinking on environmental issues with a wide array of quality technical presentations.Over 400 abstracts and 300 full papers were received by the Organizing Committees, and about 140 paper were finally accepted for presentation in 27 sessions of F-EIR Conference 2021. These papers were presented by world renowned experts from 30 countries during the event.The abstracts of papers presented are published in Volume of Abstracts, and the online proceedings contains all the accepted papers including 10 keynote lectures. Some selected papers will appear in the Science of the Total Environment, an Elsevier journal having Impact Factor 7.963, Environmental Science and Pollution Research a European Chemical Society's journal published by Springer journal having Impact Factor 4.223, Sustainability a MDPI journal having impact factor 3.251, Macromolecular Symposia a Wiley journal, Materials Today Proceedings an Elsevier journal, Lecture Notes in Civil Engineering a Springer bookseries and book volume in Springer.