Abstract
A field study was carried out from 2003 to 2004 with the aim to develop the PM2.5 emission source profiles from light-duty gasoline and heavy-duty diesel vehicles, as well as emission source profiles from waste incineration, wood burning, LP gas combustion, and meat broiling. Over 25 chemical species were quantified from the fine particles emitted by the different combustion sources investigated, including organic and elemental carbon, ions, and elements. The OC/TC ratio found in the different PM2.5 profiles was dissimilar as well as the sulfate, nitrate, ammonium, soil species, and trace element content. Consequently, these combustion emission profiles could be used in source reconciliation studies for fine particles.
Highlights
Mexico City’s Metropolitan Area (MCMA) is one of the world’s largest urban areas, with nearly 20 million inhabitants and almost 4 million vehicles within Mexico City’s Basin
The measured total carbon (TC) varied from 55% for the light-duty vehicle profile to 79% in the diesel profile, which has the highest content of elemental carbon (EC) (35%)
The crossroad profile has a high content of TC, but it could be influenced by other sources, such as vegetal material from the University gardens, emissions from a large pastry factory located two blocks away from the University, or other industries near the site
Summary
Mexico City’s Metropolitan Area (MCMA) is one of the world’s largest urban areas, with nearly 20 million inhabitants and almost 4 million vehicles within Mexico City’s Basin. The presence of particulate matter (PM) is the second largest air pollution problem, since the daily standards for STP and PM10, are frequently exceeded[1,2]. The new daily standard for PM2.5 (65 μg m–3) will motivate the Mexican government to identify and control emission sources contributing to ambient fine particles. The abundance of each specie in the source profile is the ratio of each concentration (in μg m–3) to the total mass (in μg m–3). The concentrations in the truck station and the bus garage were different, the proportions of chemical species were quite similar; only one profile was constructed to represent diesel-powered vehicle emissions (DIESEL). As the differences between the two methods were less than 6%, the percent mass reported is the average of all results obtained for each element
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