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© May 2005 Lorentz JÄNTSCHI && Sorana Daniela BOLBOACĂ

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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 +
     G03.230.300.100.150 Air D000388 +
      G03.230.300.100.150.100 Air Ionization D000390 


 H01 Natural Sciences D010811 +
  H01.181 Chemistry D002621 +
   H01.181.529 Chemistry, Physical D002627 +
    H01.181.529.065 Air Ionization D000390