October monthly average total-column ozone values for Halley station for 1957–2013.
Ozone data from British Antarctic Survey. Further information available from https://legacy.bas.ac.uk/met/jds/ozone/#data
Data used by the Department of Environment and Energy to produce graph at Figure ANT7 in the Antarctic environment theme of the 2016 State of the Environment Report, available at http://www.soe.environment.gov.au