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VOCS IN MEXICO CITY AIR
Citation:
Seila, R. AND W.A. Lonneman. VOCS IN MEXICO CITY AIR. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-93/169 (NTIS PB93221877), 1993.
Description:
Mexico City, with nearly 20 million people, 3 million vehicles, and 35,000 industrial businesses, has severe photochemical air pollution. he 0, standard of 0.11 ppm is exceeded over 300 days of the year. ecause of the role of VOCs in the production of ozone, a study of the concentration and composition of VOCs in ambient air was undertaken. rom March 6 to 26, 1992, 68 ambient air samples were collected on week-days in passivated stainless steel spheres at four sites in Mexico City. Most (52) sampling was in the morning from 6:00-9:00 am, however at 2 sites 16, 12:003:00 pm afternoon samples were collected. en morning samples were also taken at two upwind sites north of the city. he samples were analyzed by capillary gas chromatography/flame ionization detection (gc/fid) for C-2 to C-14 hydrocarbons. O and CH 4 were also determined. otal non-methane organic compound (TNMOC) concentrations were ery high. n the 6-9 am period TNMOC ranged from 1.49 to 6.94 ppm. he afternoon results were lower, ranging from 0.48 to 3.06 ppm. NMOC at the two boundary sites ranged from 0.16 to 1.64 ppm.
