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30 November 2004 Air pollution monitoring with two optical remote sensing techniques in Mexico City
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An open-path Fourier Transform Infrared (FTIR) and a Differential Optical Absorption Spectrometer (DOAS) were installed and simultaneously operated along a 426 m optical path in downtown Mexico City. O3 and SO2 were measured by both optical remote sensing techniques and the results from the comparison are presented. The instruments presented comparable sensitivities for O3 and an excellent agreement (R2 > 0.99) in their correlation. Although the sensitivity of the infrared technique for SO2 was limited to concentrations > 20 ppb or so, the agreement of the FTIR response with the more sensitive DOAS technique during the high levels of this pollutant was favorable (R2 = 0.94) and accurate to within experimental error. These episodes (>100 ppb) were found to occur several times per month. Benzene and toluene were measured by the DOAS technique and their concentrations are reported for a 3-month period during 11/2 - 12/5, 2003. The mean and highest concentration registered for benzene was 5.1 and 18.7 ppb, respectively, with an average of daily maxima at 11.5 ppb. Toluene's highest concentration during this period reached 97.3 ppb, with a mean and daily maximum average of 13.4 and 41.7 ppb, respectively. A benzene/toluene ratio of 2.6 was determined for the entire period of study and a decrease of ~20% in the daily ambient concentration of these aromatic hydrocarbons was observed on Sundays relative to weekdays.
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Michel Grutter and Edgar Flores-Jardines "Air pollution monitoring with two optical remote sensing techniques in Mexico City", Proc. SPIE 5571, Remote Sensing of Clouds and the Atmosphere IX, (30 November 2004);

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