Separation of emitted and photochemical formaldehyde in Mexico City using a statistical analysis and a new pair of gas-phase tracers

Separation of emitted and photochemical formaldehyde in Mexico City using a statistical analysis and a new pair of gas-phase tracers

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Photochemical pollution control strategies require Faber Thalia wall kitchen hood 110.0324.923-Matt White an understanding of photochemical oxidation precursors, making it important to distinguish between primary and secondary sources of HCHO.Estimates for the relative strengths of primary and secondary sources of formaldehyde (HCHO) were obtained using a statistical regression analysis with time series data of carbon monoxide (CO) and glyoxal (CHOCHO) measured in the Mexico City Metropolitan Area (MCMA) during the spring of 2003.Differences between Easter week and more Fire Guard typical weeks are evaluated.The use of CO-CHOCHO as HCHO tracers is more suitable for differentiating primary and secondary sources than CO-O3.The application of the CO-O3 tracer pair to mobile laboratory data suggests a potential in-city source of background HCHO.

A significant amount of HCHO observed in the MCMA is associated with primary emissions.