Alastair Charles Lewis (Ally Lewis) is a professor of Atmospheric Chemistry at the University of York and the National Centre for Atmospheric Science (NCAS). He has been Chair of the UK Government's independent science advisory body on air pollution, the Defra Air Quality Expert Group, since 2019.
Lewis became Chair of the Department for Transport [https://www.gov.uk/government/groups/dft-science-advisory-council Science Advisory Council] in 2021. He is currently a member of the [https://www.caa.co.uk/our-work/about-us/the-caa-s-environmental-sustainability-panel/ Environmental Sustainability Panel] of the UK Civil Aviation Authority.