"\"Content\" indicates a quantity per unit area. The \"atmosphere content\" of a quantity refers to the vertical integral from the surface to the top of the atmosphere. For the content between specified levels in the atmosphere, standard names including content_of_atmosphere_layer are used. The chemical formula for peroxynitric acid, sometimes referred to as PNA, is HO2NO2."@en . "1" . . "" . . "SDN:P07::CF12N94" . . "atmosphere_mass_content_of_peroxynitric_acid"@en . "SDN:P07::CF12N94" . "SDN:P07::CF12N94" . . "accepted"@en . "2009-07-06 15:41:29.0" . . . . "2009-07-06 15:41:29.0" . "1" . "false" .