The Ozone Hole
Home Page Contact Site Map Ozone Hole 2006
Montreal Protocol Donate Arctic Ozone About Us
Arctic Ozone 2020 What is Ozone?

 Ozone Destruction

Ozone Hole History
Ozone Hole 2019 Ozone Hole 2020 Ozone Hole 2021 Ozone Hole 2022
Ozone Hole 2023
The Ozone Hole website is made possible by a donation from

The Ozone Hole August 2012

The total ozone maps are based on ground-based measurements available from the World Ozone and Ultraviolet Radiation Data Centre. Preliminary near real-time data from ground-based observations were also used for the most recent maps. Total ozone values are given in Dobson Units. The numbers represent observations taken from ground stations situated at the bottom left corner of the number.

Maps of deviations represent total ozone deviations from the 1978-1988 level estimated using Total Ozone Mapping Spectrometer (TOMS) data for all areas except the Antarctic and from the pre-1980 level estimated using Dobson data over the Antarctic.

Over areas with poor data coverage adjustments are made according to TOMS on Nimbus-7, Meteor-3, ADEOS and Earth Probe satellites. Over the polar night area Dobson and Brewer moon observations and/or NOAA's TIROS Operational Vertical Sounder (TOVS) satellite data are used. TOVS data are also used when the more reliable TOMS data are not available. The mapping algorithm is similar to those used by the WMO Ozone Mapping Centre.

The Ozone Hole August 2012

The Ozone Hole September 2012

The Ozone Hole October 2012