TAILIEUCHUNG - Particulate Air Pollution in Mexico City: A Col laborative Research Project

Certain paints emit chemicals Credit: Daniel Case Several household consumer products emit chemicals into air , for instance cleaning products, floor care products, furniture and household fabrics, air fresheners, glues, paints, paint strippers, personal care products, printed matter , electronic equipment, candles and incense. Some studies show a link between the use of consumer products and adverse health effects. However , it is not clear to what extent pollutants are responsible for the observed effects because other factors may also contribute to them. A recent study investigated the emissions of chemicals from a large number of different consumer products. Although typical levels in indoor air were in most cases acceptable, in some occasions, accepted. | Particulate Air Pollution in Mexico City A Col laborative Research Project by . Edgerton1 . Arriaga2 J. Archuleta3 X. Bian1 . Bossert3 . Chow4 . Coulter5 . Doran1 . Doskey5 S. Elliot3 . Fast1 . Gaffney5 F. Guzman2 . Hubbe1 . Lee3 . Malone1 . Marley5 . McNair3 W. Neff6 R. Petty7 M. Ruiz2 . Shaw1 E. Vega2 . Watson4 . Whiteman1 S. Zhong 1 Pacific Northwest National Laboratory Richland WA 2 Instituto Mexicano del Petr leo Mexico City Mexico 3 Los Alamos National Laboratory Los Alamos NM 4 Desert Research Institute Reno NV 5 Argonne National Laboratory Argonne IL 6 National Oceanic and Atmospheric Administration Boulder CO 7 . Department of Energy Germantown MD ABSTRACT PM10 precursor gas and upper-air meteorological measurements were taken in Mexico City from 23 February to 22 March 1997 to understand concentrations and chemical compositions of the city s particulate matter PM . Average 24-hour PM10 concentrations over the period of study at the core sites in the city was 75 g m3. The 24-hour standard of 150 g m3 was exceeded for seven samples taken during the study period the maximum 24-hour concentration measured was 542 g m3. Nearly half of the PM10 was composed of fugitive dust from roadways construction and bare land. About 50 of the PM10 consisted of with higher percentages during the morning hours. Organic and black carbon constituted up to half of the . Particulate matter concentrations were highest during the early morning and after sunset when the mixed layers were shallow. Meteorological measurements taken during the field campaign show that on most days air was transported out of the Mexico City basin during the afternoon with little day-to-day carryover. BACKGROUND Mexico City is one of the world s largest metropolitan areas containing nearly 20 million inhabitants within the Valle de Mexico also referred to as the Mexico City basin . The Valle de Mexico occupies 1 300

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