scholarly journals Correlation between the mass of PM2,5and the chemical composition of acid aerosols in the northwest of the metropolitan zone of Mexico City

2011 ◽  
Author(s):  
Y. I. Falcón ◽  
E. Martinez ◽  
L. Cortes
Keyword(s):  
Chemical Composition ◽  
Mexico City ◽  
Metropolitan Zone

scholarly journals La situación actual del sistema de monitoreo ambiental en la Zona Metropolitana de la Ciudad de México / The Current Status of Environmental Monitoring in the Mexico City Metropolitan Zone

2009 ◽  
Vol 24 (3) ◽  
pp. 513 ◽  
Author(s):  
María Perevochtchikova
Keyword(s):  
Air Quality ◽  
Environmental Monitoring ◽  
Monitoring System ◽  
Mexico City ◽  
Urban Areas ◽  
Current Status ◽  
New Public ◽  
Environmental Monitoring System ◽  
The Social ◽  
Metropolitan Zone

Se ha visto que sin un sistema de monitoreo ambiental integral y eficiente, que propor­cione datos duros de soporte para un diagnóstico de la situación ambiental, no es posible elaborar nuevas políticas públicas para resolver la problemática que enfrentan las áreas urbanas. En el presente trabajo se revisa la situación actual del sistema de monitoreo ambiental de la Zona Metropolitana de la Ciudad de México desde tres ángulos: climatológico, hidrométrico y de calidad de aire. Asimismo se detectan sus principales avances, limitaciones y otras particularidades y al final se complementa el monitoreo ambiental con la parte social y económica. AbstractIt has been proved that without an efficient, integral environmental monitoring system that provides hard back-up data for a diagnosis of the environmental situation, it is impossible to draw up new public policies to solve the problem faced by urban areas. This paper reviews the current status of environmental monitoring in the Mexico City Metropolitan Zone from three angles: climatological, hydrometric and air quality. It also detects the main progress, limitations and other particularities and at the end, environmental monitoring is complemented by the social and economic part.

scholarly journals Seasonal changes in the PM1 chemical composition north of Mexico City

Atmósfera ◽  
2017 ◽  
Vol 30 (3) ◽  
pp. 243-258 ◽  
Author(s):  
Franco Guerrero ◽  
◽  
Harry Alvarez-Ospina ◽  
Armando Retama ◽  
Alfonso López-Medina ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Mexico City ◽  
Seasonal Changes

scholarly journals Conflictos por el espacio y orden urbano / Spatial Conflicts and Urban Order

2004 ◽  
Vol 19 (2) ◽  
pp. 257 ◽  
Author(s):  
Emilio Duhau ◽  
Ángela Giglia
Keyword(s):  
Mexico City ◽  
Urban Space ◽  
Urban Context ◽  
Private Spaces ◽  
Space Organization ◽  
Urban Contexts ◽  
Space Production ◽  
Metropolitan Zone

En este artículo se explora una interpretación de los conflictos en torno al espacio en la Zona Metropolitana de la Ciudad de México (ZMCM) con base en los conceptos de orden y de contextos urbanos. Para ello se presenta en primer término un conjunto de formas históricas de producción del espacio urbano que, de acuerdo con los autores, conforman en la actualidad cuatro “ciudades”, es decir, otros tantos contextos urbanos que se diferencian entre sí, entre otras cuestiones, por el tipo de conflictos por el espacio que en cada uno de ellos aparece como dominante. En segundo término se examina el concepto de orden urbano y se propone una línea de interpretación de los conflictos relacionados con el espacio que marcan en la actualidad dicho orden en la metrópoli. Por último se describen e ilustran las dinámicas que caracterizan a cada uno de los cuatro contextos urbanos o “ciudades” a partir de las formas en que se combinan diferentes modalidades de organización del espacio, usos del espacio público y privado y conflictos dominantes por el espacio. AbstractResorting to the concepts of urban order and urban context, this paper explores an interpretation of conflicts concerning the uses and modes of appropriation of urban space in the metropolitan zone of Mexico City. To this end, it firstly characterizes a group of historical forms of urban space production that, according with the authors, have given place to four types of “cities” or urban contexts which are differentiated, among other things, because of the dominant spatial conflicts in each case observed. Then it discusses the concept of urban order and proposes an interpretation line of those spatial conflicts that, at present, shape the metropolitan urban order. Finally, it describes and exemplifies the four urban contexts dynamic, considering the ways in which different modalities of urban space organization, uses of public a private spaces, and dominant space conflicts are combined.

Basis for a Policy for the Development of Logistics Platforms in the Metropolitan Zone of Mexico City

2006 ◽  
pp. 375-387 ◽  
Author(s):  
Angélica Lozano ◽  
Juan Pablo Antún ◽  
Clemencia Santos ◽  
Rodrigo Alarcón ◽  
Francisco Granados ◽  
...  
Keyword(s):  
Mexico City ◽  
Metropolitan Zone

Chemical composition of PM2.5 and PM10 in Mexico City during winter 1997

2002 ◽  
Vol 287 (3) ◽  
pp. 177-201 ◽  
Author(s):  
Judith C Chow ◽  
John G Watson ◽  
Sylvia A Edgerton ◽  
Elizabeth Vega
Keyword(s):  
Chemical Composition ◽  
Mexico City ◽  
Pm2.5 And Pm10

scholarly journals Chemical composition of rainwater collected from 2006 to 2009 in Mexico City and at a rural site at Morelos State, south central Mexico

2020 ◽  
Vol 37 (1) ◽  
pp. 1-8
Author(s):  
Rocío García-Martínez ◽  
Alejandro Carrillo-Chavez ◽  
Ricardo Torres-Jardón ◽  
Alejandro Ramirez-Guzmán ◽  
Moisés López-Carrasco
Keyword(s):  
Chemical Composition ◽  
Mexico City ◽  
Atmospheric Transport ◽  
Sampling Site ◽  
Air Pollutant ◽  
Rural Site ◽  
Central Mexico ◽  
Strong Positive Correlation ◽  
Back Trajectories ◽  
South Central

The objective of the study was to evaluate the chemical composition of rainwater in urban and suburban areas of central Mexico to identify the possible sources of rainwater contamination. The rainwater was collected at Universidad Nacional Autónoma de Mexico, Campus Ciudad Universitaria (CU), in the southern part of Mexico City at 2200 meters above sea level (m a.s.l.). CU has many green areas with high to moderate traffic densities where air quality presents serious problems of pollution by particulate matter. The other sampling site is a forested rural area (Tlalnepantla), State of Morelos, Mexico, a suburban area 86 km to the south of Mexico City. A total of 145 rainwater samples were collected in the rain period from 2006 to 2009. The ions analyzed were the following: SO42-, NO3-, Cl-, HCO3-, Na+, K+, Ca2+, Mg2+, NH4+ and H+. Ammonium was the most abundant cation in both sites and is one of those responsible for the neutralization of acidic compounds in the atmosphere. The relative abundance of the inorganic anions present in the rainwater was in the following order: SO42- > NO3- > Cl-, for the alkaline metals the order was Ca2+ >Mg2+ > Na+ > K+ and Ca2+ >Mg2+ >K+ >Na+ for CU and Morelos, respectively. A correlation analysis shows a strong positive correlation among the ions, indicating that the most important source was anthropogenic. Air mass back trajectories were associated with the SO42-, Ca2+, Mg2+, NH4+ and H+ concentrations observed on each rainy day. Four factors were used in the statistic analysis and was weighted within each factor. Weights greater than 0.5 are considered to be significant components of each factor. The four factors explain 84.7 % of the total variance of all of the data for CU and 66.9 % for Morelos. All of these factors were associated with all of the analyzed ions. Air pollutant back trajectories were used to understand atmospheric transport and to identify the origins and pathways of air masses influencing the concentrations of the measured ions in rainwater.

Chemical composition of fugitive dust emitters in Mexico City

2001 ◽  
Vol 35 (23) ◽  
pp. 4033-4039 ◽  
Author(s):  
E. Vega ◽  
V. Mugica ◽  
E. Reyes ◽  
G. Sánchez ◽  
J.C. Chow ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Mexico City ◽  
Fugitive Dust

scholarly journals The importance of aerosol mixing state and size-resolved composition on CCN concentration and the variation of the importance with atmospheric aging of aerosols

2010 ◽  
Vol 10 (15) ◽  
pp. 7267-7283 ◽  
Author(s):  
J. Wang ◽  
M. J. Cubison ◽  
A. C. Aiken ◽  
J. L. Jimenez ◽  
D. R. Collins
Keyword(s):  
Chemical Composition ◽  
Size Distribution ◽  
Mexico City ◽  
Aerosol Size Distribution ◽  
Mixing State ◽  
Global Models ◽  
Secondary Species ◽  
Wide Range ◽  
Aerosol Mixing State ◽  
Aerosol Volume

Abstract. Aerosol microphysics, chemical composition, and CCN concentrations were measured at the T0 urban supersite in Mexico City during Megacity Initiative: Local and Global Research Observations (MILAGRO) in March 2006. The aerosol size distribution and composition often showed strong diurnal variation associated with traffic emissions and aging of aerosols through coagulation and local photochemical production of secondary aerosol species. CCN concentrations (NCCN) are derived using Köhler theory from the measured aerosol size distribution and various simplified aerosol mixing state and chemical composition, and are compared to concurrent measurements at five supersaturations ranging from 0.11% to 0.35%. The influence of assumed mixing state on calculated NCCN is examined using both aerosols observed during MILAGRO and representative aerosol types. The results indicate that while ambient aerosols often consist of particles with a wide range of compositions at a given size, NCCN may be derived within ~20% assuming an internal mixture (i.e., particles at a given size are mixtures of all participating species, and have the identical composition) if great majority of particles has an overall κ (hygroscopicity parameter) value greater than 0.1. For a non-hygroscopic particle with a diameter of 100 nm, a 3 nm coating of sulfate or nitrate is sufficient to increase its κ from 0 to 0.1. The measurements during MILAGRO suggest that the mixing of non-hygroscopic primary organic aerosol (POA) and black carbon (BC) particles with photochemically produced hygroscopic species and thereby the increase of their κ to 0.1 take place in a few hours during daytime. This rapid process suggests that during daytime, a few tens of kilometers away for POA and BC sources, NCCN may be derived with sufficient accuracy by assuming an internal mixture, and using bulk chemical composition. The rapid mixing also indicates that, at least for very active photochemical environments such as Mexico City, the timescale during daytime for the conversion of hydrophobic POA and BC to hydrophilic particles is substantially shorter than the 1–2 days used in some global models. The conversion time scale is substantially longer during night. Most POA and BC particles emitted during evening hours likely remain non-hygroscopic until efficiently internally mixed with secondary species in the next morning. The results also suggest that the assumed mixing state strongly impacts calculated NCCN only when POA and BC represent a large fraction of the total aerosol volume. One of the implications is that while physically unrealistic, external mixtures, which are used in many global models, may also sufficiently predict NCCN for aged aerosol, as the contribution of non-hygroscopic POA and BC to overall aerosol volume is often substantially reduced due to the condensation of secondary species.

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