Hydroxyl free radicals are part of a complex network of atmospheric chemical reactions. But a long-term study shows that their concentration can be predicted by the intensity of ultraviolet sunlight alone.
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Wennberg, P. Radicals follow the Sun. Nature 442, 145–146 (2006). https://doi.org/10.1038/442145a
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DOI: https://doi.org/10.1038/442145a
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