Ozone-map reading record
Yenra | Updated September 10, 2026
Article: https://yenra.com/ozone-layer-pictures/

Instructions: Save this UTF-8 text file and fill in the fields in any text editor. Keep dated source references with the completed record. Blank fields are prompts for your information.

Use an actual scientific map with its original legend. The article hero is conceptual.
Question the image should answer:
Provider / product / direct URL / access date:
Instrument or combined dataset / processing notes:
Quantity / units / coverage / observation or averaging dates:
Legend endpoints / missing-data meaning:
Column units: 1 DU = 0.01 mm of compressed ozone at 0 C and 1 atmosphere.
Worked conversion: 300 DU = 3 mm under those conditions, not atmospheric layer thickness.
Area definition, if present / area units:
Comparison product / dates / same season and scale?:
Fictional teaching values: day A area 20 million km2, minimum 110 DU;
day B area 18 million km2, minimum 100 DU.
Changes: area -2 million km2; minimum -10 DU. These are different measures.
Observed spatial feature:
What this image supports:
Time-series or assessment evidence for a longer-term claim:
Uncertainty / assumptions / next check:
Caption with quantity, place, time, units and source:

Primary references consulted for the accompanying guide:
https://ozonewatch.gsfc.nasa.gov/
https://ozonewatch.gsfc.nasa.gov/facts/dobson_SH.html
https://ozonewatch.gsfc.nasa.gov/facts/hole_SH.html
https://www.unep.org/news-and-stories/press-release/ozone-layer-recovery-track-helping-avoid-global-warming-05degc