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Antarctic ozone hole size markets

How SoftCta readers read ozone hole contracts — how the hole is measured, which agency and averaging period settles a market, and how recovery trends interact with year-to-year swings. · 3 min read

Updated 22 Oct 2026

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Antarctic ozone hole size markets

The Antarctic ozone hole is one of the best documented environmental signals, with satellite records stretching back decades. Each southern spring it grows and then shrinks, and event contracts sometimes ask whether it will exceed a size, rank among the largest on record, or close by a date. The numbers come from scientific agencies with specific definitions. This SoftCta guide explains those definitions so a reader can match a contract to the right statistic.

The 220 Dobson unit line

Ozone is measured in Dobson units, a measure of the total amount of ozone in a column of air. The ozone hole is usually defined as the area with less than 220 Dobson units. Area is reported in millions of square kilometres. A contract might name the area, the minimum ozone concentration, or both.

Single day versus seasonal average

NASA reports the largest single-day area and an average over a set period in September and October. Single-day peaks are more volatile than seasonal averages. A headline that says this year's ozone hole is among the largest may refer to either. Copy the statistic and the period from the contract rules.

Different agencies, slightly different numbers

NASA, NOAA and Copernicus use different instruments, models and processing. Their numbers are close but not identical. Our weather verification guide covers why naming one source matters, and the same logic applies here.

Why years vary

Ozone loss depends on very cold stratospheric temperatures and the strength of the polar vortex. A warm, disturbed vortex can produce a small hole; a cold, stable one a large hole. Volcanic eruptions and wildfire smoke reaching the stratosphere have been linked to larger holes in some years. Long-term recovery under the Montreal Protocol is real but slow, so any single year can buck the trend. Our regression to the mean guide explains why an extreme year is often followed by a less extreme one.

Closing date questions

Some contracts ask when the hole will close, meaning when the area below 220 Dobson units drops to zero. That typically happens in November or December. The exact definition of closure and the source matter.

Settlement in practice

NASA Ozone Watch and Copernicus publish daily data online, which makes these contracts unusually checkable. Bookmark the named source and read it directly rather than relying on summaries.

Questions to ask first

Which agency, which statistic, which period, and which units? Most confusion in ozone markets comes from mixing a single-day peak with a seasonal average, or one agency's figure with another's.

Primary sources SoftCta readers open

  • NASA Ozone Watch daily and seasonal statistics.
  • NOAA Global Monitoring Laboratory ozone measurements.
  • Copernicus Atmosphere Monitoring Service ozone bulletins.
  • WMO/UNEP Scientific Assessment of Ozone Depletion.

Reading the quote step by step

  • Read the full title and rules, including the named settlement source and the time zone.
  • Convert the Yes and No prices to implied probabilities and note the gap between them.
  • Subtract fees and spread to see the effective price you would actually face.
  • Write your own probability range and the evidence behind it, then compare.
  • Check related and near-duplicate markets on other venues for consistency.

Closing SoftCta checklist

  • Re-read the venue definition in your own words before reacting to a price.
  • Convert prices with fee and spread awareness; verify live cents on the operator.
  • Prefer primary settlement sources over secondary headlines and social summaries.
  • Treat ChanceWire hubs, movers, and tools as orientation — not order entry.
  • Confirm age, location, and product eligibility; SoftCta pages will not suggest location spoofing.
  • If clarity is incomplete, watching is a complete SoftCta outcome — no pick-selling urgency required.

SoftCta habits

  • Write your own probability range before checking the crowd price.
  • Prefer dated primary sources over social summaries.
  • Compare related markets when a single book looks extreme.
  • Size curiosity with fees and depth in mind; substantial risk of loss.

FAQ

How is the ozone hole defined?
Scientists usually define it as the area where total column ozone falls below 220 Dobson units, a level well below historical norms over Antarctica.
When does the ozone hole peak?
The Antarctic ozone hole forms in the southern spring, typically reaching its largest extent between mid-September and early October.
Who measures it?
NASA and NOAA publish daily ozone hole area and seasonal statistics. The Copernicus Atmosphere Monitoring Service also tracks the hole using satellite data and models.
Is the ozone layer recovering?
Scientific assessments under the Montreal Protocol project gradual recovery, with the Antarctic ozone layer expected to return toward 1980 levels around the 2060s. Individual years still vary widely.

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