VOCs in Mexico City ambient air
Mexico City, with nearly 20 million people, 3 million vehicles, and 35,000 industrial businesses, has severe photochemical air pollution. The O3 standard of 0.11 ppm is exceeded over 300 days of the year. Because of the role of VOCs in the production of ozone, a study of the concentration and composition of VOCs in ambient air was undertaken. From 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, 12:00-3:00 pm afternoon samples were collected. Ten morning samples were also taken at two upwind sites north of the city. The samples were analyzed by capillary gas chromatography/flame ionization detection (gc/fid) for C-2 to C-14 hydrocarbons. CO and CH4 were also determined. Total non-methane organic compound (TNMOC) concentrations were very high. In the 6-9 am period TNMOC ranged from 1.49 to 6.94 ppm. The afternoon results were lower, ranging from 0.48 to 3.06 ppm. TNMOC at the two boundary sites ranged from 0.16 to 1.64 ppm.
- Research Organization:
- Environmental Protection Agency, Research Triangle Park, NC (United States). Atmospheric Research and Exposure Assessment Lab.
- OSTI ID:
- 5855352
- Report Number(s):
- PB-93-221877/XAB; EPA--600/A-93/169
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AIR POLLUTION MONITORING
ALKANES
AMBIENT TEMPERATURE
AROMATICS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CARBON 14
CARBON COMPOUNDS
CARBON ISOTOPES
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMATOGRAPHY
DATA
DEVELOPING COUNTRIES
ECOLOGICAL CONCENTRATION
EVEN-EVEN NUCLEI
GAS CHROMATOGRAPHY
HYDROCARBONS
INFORMATION
ISOTOPES
LATIN AMERICA
LIGHT NUCLEI
METHANE
MEXICO
MONITORING
NORTH AMERICA
NUCLEI
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
OZONE
PHOTOCHEMICAL REACTIONS
RADIOISOTOPES
SAMPLING
SEPARATION PROCESSES
STANDARDS
STATISTICAL DATA
VEHICLES
YEARS LIVING RADIOISOTOPES