Simple Collection and assay of NO and NO2 using solid chemical absorbents was proven feasible. The selective collection of these oxides is possible with a tandem arrangement of two absorbent cartridges: The first, containing triethanolamine hydrochloride packing, completely absorbs NO2 from the air sample without affecting the NO concentration. The second, filled with cobalt oxide packing, quantitatively removes NO. These collected oxides are later eluted and analyzed separately. The interface devide developed to transfer the sample for analysis accepts one collector cartridge and heats it to a temperature which releases the nitrogen oxide. When cooled the collector cartridges are ready for reuse in sample collection. The identification and characterization of solid chemical absorbents, their evaluations, and interference studies are described. Additional experimental techniques and data analysis is presented. A weatherproof collection system was built for field collection. Recommendations for further work are detailed.