The article discusses the wavelengths in sunlight that are most effective in causing skin cancer, focusing on DNA damage. It summarizes data on DNA sensitivity to UV light and calculates the carcinogenic effectiveness based on the sun's spectrum and DNA action spectrum. The most effective wavelengths are below 305 nm, and a 1% change in atmospheric ozone leads to a 2% change in UV dose. The study emphasizes the need for better epidemiological data to evaluate the dose-response relationship for UV-induced skin cancer in humans. Human skin cancers, especially basal and squamous cell carcinomas, are closely linked to sun exposure. Evidence suggests that the most effective wavelengths for skin cancer are below 320 nm. These include the effectiveness of shorter wavelengths in damaging DNA, which is a key factor in UV-induced skin cancer. The study also notes that UV-induced skin cancer is likely due to photochemical changes in DNA, and that shorter wavelengths are more effective in damaging this polymer. The article discusses the use of DNA action spectra for estimating the carcinogenic effects of UV light. It argues that the DNA damage action spectrum is more relevant than the erythemal action spectrum for estimating the carcinogenic effects of UV light. The study also highlights the importance of understanding the relationship between DNA damage and skin cancer, as well as the need for better epidemiological data to evaluate this relationship. The study calculates the probability of DNA damage based on the sun's spectrum, the transmission of the skin, and the cross-section for the reaction. It shows that wavelengths below 305 nm are more effective in causing DNA damage. The study also discusses the impact of ozone changes on UV dose and the importance of considering the ozone layer's thickness at different latitudes. The study concludes that the use of DNA action spectra provides a more accurate estimate of the carcinogenic effects of UV light than the erythemal action spectrum.The article discusses the wavelengths in sunlight that are most effective in causing skin cancer, focusing on DNA damage. It summarizes data on DNA sensitivity to UV light and calculates the carcinogenic effectiveness based on the sun's spectrum and DNA action spectrum. The most effective wavelengths are below 305 nm, and a 1% change in atmospheric ozone leads to a 2% change in UV dose. The study emphasizes the need for better epidemiological data to evaluate the dose-response relationship for UV-induced skin cancer in humans. Human skin cancers, especially basal and squamous cell carcinomas, are closely linked to sun exposure. Evidence suggests that the most effective wavelengths for skin cancer are below 320 nm. These include the effectiveness of shorter wavelengths in damaging DNA, which is a key factor in UV-induced skin cancer. The study also notes that UV-induced skin cancer is likely due to photochemical changes in DNA, and that shorter wavelengths are more effective in damaging this polymer. The article discusses the use of DNA action spectra for estimating the carcinogenic effects of UV light. It argues that the DNA damage action spectrum is more relevant than the erythemal action spectrum for estimating the carcinogenic effects of UV light. The study also highlights the importance of understanding the relationship between DNA damage and skin cancer, as well as the need for better epidemiological data to evaluate this relationship. The study calculates the probability of DNA damage based on the sun's spectrum, the transmission of the skin, and the cross-section for the reaction. It shows that wavelengths below 305 nm are more effective in causing DNA damage. The study also discusses the impact of ozone changes on UV dose and the importance of considering the ozone layer's thickness at different latitudes. The study concludes that the use of DNA action spectra provides a more accurate estimate of the carcinogenic effects of UV light than the erythemal action spectrum.