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The Mexico City Metropolitan Area (MCMA) has presented severe pollutionproblems for many years. There are several point and mobile emission sourcesinside and outside the MCMA which are known to affect air quality in thearea. In particular, speculation has risen as to whether the Tula industrialcomplex, located 60 km northwest of the MCMA has any influence on highSO2 levels occurring on the northern part of the city, in the winterseason mainly. As part of the MILAGRO Field Campaign, from 24 March to 17April 2006, the differential vertical columns of sulfur dioxide (SO2)and nitrogen dioxide (NO2) were measured during plume transects in theneighborhood of the Tula industrial complex using mobile mini-DOASinstruments. Vertical profiles of wind speed and direction obtained frompilot balloons and radiosondes were used to calculate SO2 and NO2emissions. According to our measurements, calculated average emissions ofSO2 and NO2 during the field campaign were 384±103 and 24±7 tons day−1,respectively. The standard deviation of theseestimations is due to actual variations in the observed emissions from therefinery and power plant, as well as to the uncertainty in the wind fieldsat the exact time of the measurements. Reported values in recent inventorieswere found to be in good agreement with calculated emissions during thefield campaign. Our measurements were also found to be in good agreementwith simulated plumes

atmospheric chemistry and physics

Tula industrial complex (Mexico) emissions of SO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; and NO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; during the MCMA 2006 field campaign using a mobile mini-DOAS system