Primary Air Pollutants Hydrocarbons-Group of organic compounds consisting of carbon and hydrogen Evaporated from automobile fuel or remnants of fuel incompletely burned Catalytic converters used to burn exhaust gases more completelyPrimary Air Pollutants • Hydrocarbons - Group of organic compounds consisting of carbon and hydrogen. – Evaporated from automobile fuel or remnants of fuel incompletely burned. ™ Catalytic converters used to burn exhaust gases more completely