Living under the ozone hole: the reality for one Chilean city
Punta Arenas sits near the southern tip of Chile, making it one of the most southerly cities on Earth. Its location also places it beneath the Antarctic ozone hole when this thinning in the protective layer drifts northward from the polar region. The hole's position shifts, meaning the city experiences periods of intense exposure rather than constant coverage.
For many of the 150,000 residents, this has shaped daily life for more than two decades, though individual experiences vary depending on occupation and lifestyle.
Skin cancer rates and falling ozone levels
Research carried out between 1987 and 2000 found that skin cancer diagnoses in Punta Arenas rose by over 65 percent compared with earlier periods. During the same timeframe, ozone measurements dropped to as low as 145 Dobson Units, representing a fall of more than half from previously recorded levels. While this data is now dated, it documents the period when the ozone hole's effects were most severe.
The connection between reduced ozone and increased UV-B exposure is well established. UV-B radiation damages skin cells and can lead to melanoma and non-melanoma skin cancers, particularly squamous cell carcinoma, which is strongly linked to cumulative sun exposure.
In 2000, local authorities issued warnings advising people to stay indoors between 11am and 3pm for over a month. Those who needed to go outside were told to wear wide-brimmed hats, long sleeves, strong sunscreen and UV-protective sunglasses.
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Warning systems and ongoing precautions
The city operates a UV alert system that notifies residents when radiation levels are particularly high. At peak times, unprotected skin can burn within five minutes. Local media broadcast daily UV forecasts alongside weather reports.
Schools have adjusted break times during high-risk periods. These measures have become embedded in local routines rather than treated as temporary responses. The adjustments represent significant lifestyle changes that residents have maintained over years.
The Montreal Protocol, signed in 1987, has helped reduce the chemicals responsible for ozone depletion. Scientists have observed some recovery in the ozone layer, with projections suggesting the Antarctic ozone hole could largely heal by 2066, according to a 2023 UN assessment. However, recovery remains uneven across different regions.
What this means for the UK
The UK does not face the same level of ozone depletion as southern Chile. Our position in the northern hemisphere places us further from the Antarctic hole, and ozone levels over Britain remain within safer ranges for most of the year.
However, UV radiation still poses risks here, particularly during summer months. The Met Office provides UV index forecasts, and the UK Health Security Agency recommends sun protection when the UV index reaches 3 or above.
The story of Punta Arenas illustrates how environmental changes can reshape everyday behaviour. What began as emergency measures in the 1990s and 2000s evolved into permanent adjustments for a city living with weakened atmospheric protection. For UK readers, the ozone layer remains an invisible but essential shield, one whose gradual recovery stands as evidence that international environmental agreements can produce measurable results over time.
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