Why UV Index alone isn’t the full story (UVA/VL/IR)
The UV Index is a great daily signal for sunburn risk, but it doesn’t describe the whole exposure landscape that drives photoaging, hyperpigmentation, and inflammation. The index is calculated using an erythema-weighted action spectrum—basically a formula tuned to wavelengths that cause visible redness (mostly UVB, with limited UVA weighting). Wikipedia+2World Health Organization+2So two days can […]
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