Primary and secondary carbonyls as a product of mobile source emissions related to atmospheric carbon monoxide and ozone in the Mexico City Metropolitan Zone

Carbonyls were measured in five sampling sites at the Mexico City Metropolitan Zone (MCMZ). The same air quality sampling methodology and two different analytical techniques for the evaluation of carbonyls in the atmosphere were used. The highest concentrations of the 73 carbonyls were related to the peaks of CO and O3, as well as with the concentrations of NO2, in the atmosphere of the MCMZ. In all sampling sites, the acetone presented the highest concentration, followed by formaldehyde, acetaldehyde, 2-butanone, and propanal. The highest concentration of formaldehyde at the CO peak (morning) was found at the Downtown station and the Northeast station; while the highest concentration at the ozone peak (afternoon) was at the Downtown station and at Northeast station. This is an abstract of a paper presented at the 102nd Air %26amp; Waste Management Association Annual Conference and Exhibition (Detroit, MI 6/16-19/2009).

VIVO