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 G03 Environment and Public Health D004778 +
  G03.230 Environment D004777 +
   G03.230.300 Meteorological Factors D008685 +
    G03.230.300.100 Atmosphere D001272 +
     G03.230.300.100.725 Weather D014887 +
      G03.230.300.100.725.525 Sunlight D013472 +
       G03.230.300.100.725.525.600 Ultraviolet Rays D014466 

 H01 Natural Sciences D010811 +
  H01.671 Physics D010825 +
   H01.671.768 Radiation D011827 +
    H01.671.768.638 Radiation, Nonionizing D011840 +
     H01.671.768.638.943 Ultraviolet Rays D014466