The Californai Air Resources Board (CARB) Method 1004 for measuring aldehydes and ketones in air is used by the automotive industry to measure car exhaust. This method has the most comprehensive list of carbonyls that require analysis. Conventional C18 columns need extremely long columns and analysis times to separate the dinitrophenylhydrazone derivatives. The Acclaim Explosives E2 column with its unique selectivity for nitro-aromatic compounds resolves this set better than any other column on the market.