The ozone layer — a region of the stratosphere between roughly 15 and 35 kilometers altitude with elevated concentrations of ozone (O3) — absorbs the majority of the sun’s ultraviolet B (UVB) and virtually all ultraviolet C (UVC) radiation before it reaches the earth’s surface. UVB causes DNA damage in skin cells, leading to sunburn, accelerated skin aging, immune suppression, and skin cancer. UVC, which is entirely absorbed by the atmosphere under normal conditions, is lethal to biological tissue and is used in germicidal lamps precisely because it destroys DNA. What reaches the earth’s surface under the current atmospheric conditions, and what has changed, is not what most people have been told.
The official narrative: the Montreal Protocol, adopted in 1987 and ratified by every nation on earth, banned chlorofluorocarbons (CFCs) and other ozone-depleting substances. The ozone layer is recovering. Problem solved. The reality is more complicated — ozone depletion continues in ways the official story does not fully account for, UV index readings have increased beyond what ozone depletion alone would predict, and independent researchers measuring UV at the surface are documenting levels that are significantly higher than official forecasts in some locations and seasons.
WHAT OZONE DEPLETION ACTUALLY MEANS FOR UV EXPOSURE
A 1% decrease in stratospheric ozone is estimated to produce a 2% increase in UVB reaching the earth’s surface. The Antarctic ozone hole — which still forms seasonally — represents depletions of 50-70% of ozone in the polar stratosphere during spring. Mid-latitude ozone depletion is less dramatic but ongoing. The recovery timeline projected by atmospheric scientists extends to approximately 2060-2070 for full recovery — meaning the generation alive today will spend their entire lives under a compromised ozone layer.
UV index values above 10 — classified as extreme — are now regularly reported at mid-latitudes that historically did not experience such levels. Multiple independent researchers using calibrated UVB and UVC meters have documented surface UVC readings in locations where UVC should not reach the surface at measurable levels. Whether this represents instrument calibration issues, localized atmospheric anomalies, or evidence of greater ozone depletion than officially acknowledged is contested. The measurements, from multiple independent sources using different equipment, are consistent enough to take seriously.
Melanoma rates have increased significantly over the past four decades — faster than ozone depletion alone would predict if UV were the only factor. Other contributors to melanoma risk include chemical exposures that compromise DNA repair mechanisms, immune suppression from multiple sources, and the carcinogenic ingredients in some conventional sunscreens (oxybenzone, octinoxate) that may themselves contribute to the problem they are marketed to solve.
WHAT SUNSCREEN DOES AND DOES NOT DO
Chemical sunscreens — oxybenzone, octinoxate, octisalate, homosalate, avobenzone — work by absorbing UV radiation and releasing the energy as heat. They are effective at reducing UVB exposure. They are also endocrine disruptors. Oxybenzone is detected in human blood, urine, and breast milk. The FDA’s 2019 proposed rules found that only two sunscreen active ingredients — zinc oxide and titanium dioxide — had sufficient safety data to be classified as Generally Recognized as Safe and Effective (GRASE). The chemical filters did not meet this standard — not because they were proven unsafe, but because the safety data required to make that determination did not exist. The FDA acknowledged that oxybenzone is absorbed systemically at levels that exceed the threshold requiring further safety testing. That testing has not been completed.
Mineral sunscreens — zinc oxide and titanium dioxide — sit on the skin surface and physically block UV radiation rather than absorbing it chemically. Non-nano zinc oxide (particles large enough not to penetrate the skin) is the safest and most effective option. Zinc oxide also provides broad-spectrum UVA and UVB protection. The white cast that was the historical objection to mineral sunscreens has been largely addressed in current formulations. The Environmental Working Group’s sunscreen database (ewg.org/sunscreen) rates sunscreen products for both UV protection efficacy and ingredient safety and is a useful reference.
SPF applies only to UVB protection, not UVA. UVA penetrates deeper into the skin, causes DNA damage in lower skin layers, suppresses skin immune function, and contributes to melanoma and premature aging. A product with high SPF and no UVA protection — which is possible under current labeling rules — provides false confidence. Look for broad-spectrum labeling and for zinc oxide as the active ingredient for genuine full-spectrum protection.
THE VITAMIN D PROBLEM
The same UVB radiation that causes sunburn also triggers vitamin D synthesis in the skin. Vitamin D is not a vitamin in the conventional sense — it is a hormone precursor with receptors in virtually every cell in the body. Vitamin D deficiency is associated with increased risk of multiple cancers, autoimmune disease, cardiovascular disease, depression, cognitive decline, and impaired immune function. Approximately 40% of Americans are deficient by conservative estimates — some researchers put the number significantly higher when optimal rather than minimum levels are considered.
The public health message to avoid sun exposure and wear sunscreen at all times — while protecting against sunburn and skin cancer risk — has contributed to epidemic vitamin D deficiency. The skin can only produce vitamin D from UVB during specific hours (roughly 10am-3pm at mid-latitudes when the sun is high enough), cannot produce it through glass, and produces less in darker skin tones and at higher latitudes. Older skin is less efficient at vitamin D synthesis. The blanket advice to cover up and use sunscreen whenever outdoors has a real cost that is rarely factored into the public health calculation.
Sensible sun exposure — enough midday sun to produce a pink tinge on untreated skin, which represents meaningful vitamin D synthesis, followed by covering up or applying mineral sunscreen before burning occurs — is a more nuanced and physiologically appropriate approach than total sun avoidance. Supplemental vitamin D3 with vitamin K2 (K2 directs calcium to bones rather than arteries, which is important when supplementing D3 at higher doses) addresses deficiency for those who cannot get adequate sun exposure.
PRACTICAL PROTECTION
Check the UV index before outdoor time, particularly between April and September at Illinois latitudes. UV index above 6 warrants protection. Above 10, significant protection is needed for any extended outdoor exposure. The UV index peaks around solar noon — 1pm daylight saving time — and is significantly lower in the morning and late afternoon.
Physical protection — hats with brims, UPF-rated clothing, shade — is more reliable than sunscreen for extended outdoor exposure and does not introduce chemical exposure. A wide-brimmed hat provides substantial face, neck, and ear protection that sunscreen application frequently misses. Long sleeves in lightweight, breathable fabric are appropriate during high UV index periods. Seek shade during peak UV hours for extended outdoor work or recreation.
SUPPORTING YOUR BODY
Vitamin D3 with K2: Test your vitamin D level (25-OH vitamin D blood test) to know your baseline. Optimal levels are generally considered 50-80 ng/mL. Supplement accordingly — most deficient adults need 2,000-5,000 IU daily to reach optimal levels, though individual variation is significant. Take with K2 (100-200 mcg MK-7 form) and with a fat-containing meal for absorption.
Astaxanthin: A carotenoid antioxidant found in salmon, shrimp, and microalgae that accumulates in skin tissue and provides internal UV protection — not a sunscreen replacement, but a documented reduction in UV-induced oxidative damage and sunburn sensitivity with regular supplementation. Several clinical studies have found astaxanthin supplementation reduces UV-induced skin damage markers.
Polyphenol-rich diet: Lycopene (tomatoes, watermelon), beta-carotene (orange and yellow vegetables), and green tea polyphenols have documented photoprotective effects through antioxidant mechanisms in skin tissue. A diet rich in these compounds provides a meaningful layer of internal UV protection that complements external strategies.
Red raspberry seed oil: Has a naturally occurring SPF of approximately 28-50 against UVB and high UVA protection according to some studies. Used as a carrier oil in natural sunscreen formulations. Not a replacement for tested mineral sunscreen for high-UV-index exposure but a useful component in a layered approach for moderate sun exposure.
Cross-reference: Know Your Air — Geoengineering | Know Your Body | Know Your Food — Building Your Food Protocol | Herbal Remedies | Root Cellar
FROM THE BUNKER
Cracks in the Sky — Chip O’Gamma
“Put on your hat for these ultraviolet days / if the heavens twitch and the pigeons fry / just waltz in the haze til the end walks by.”
Chip O’Gamma plays the government spokesman who almost cries while telling you everything is fine. The sky is cracking, it leaks purple rain at a government rate, and the official word is pure delight. He is the sunscreen aisle. He is the UV index app. He is everyone who tells you the ozone is recovering while you squint into a sky that feels different than it used to.
Listen on KaNafia
FROM THE WASTELAND
Leaf Juice — Wasteland Survival Series, Book 1
Skin-protective herb preparations and internal UV support protocols including astaxanthin sources and polyphenol-rich preparations have guides in Leaf Juice.
Paperback | Kindle