Commuters’ exposure to PM2.5, CO, and benzene in public transport in the metropolitan area of Mexico City

2004 ◽  
Vol 38 (8) ◽  
pp. 1219-1229 ◽  
Author(s):  
J.E Gómez-Perales ◽  
R.N Colvile ◽  
M.J Nieuwenhuijsen ◽  
A Fernández-Bremauntz ◽  
V.J Gutiérrez-Avedoy ◽  
...  
Keyword(s):  
Mexico City ◽  
Metropolitan Area ◽  
Public Transport

scholarly journals Air Pollution and Mobility in the Mexico City Metropolitan Area in Times of COVID-19

2021 ◽  
Author(s):  
José Eduardo Vera Valdés ◽  
Carlos Vladimir Rodríguez Caballero
Keyword(s):  
Air Pollution ◽  
Mexico City ◽  
Metropolitan Area ◽  
Public Transport ◽  
Public Transportation ◽  
Pollution Levels ◽  
Causality Tests ◽  
Private Car ◽  
The Government ◽  
Transport Mobility

This paper analyzes the relation between COVID-19, air pollution, and public transport mobility in the Mexico City Metropolitan Area (MCMA). We test if the restrictions to economic activity introduced to mitigate the spread of COVID-19 are associated with a structural change in air pollution levels and public transport mobility. Our results show that mobility in public transportation was significantly reduced following the government's recommendations. Nonetheless, we show that the reduction in mobility was not accompanied by a reduction in air pollution. Furthermore, Granger-causality tests show that the precedence relation between public transport mobility and air pollution disappeared as a product of the restrictions. Thus, our results suggest that air pollution in the MCMA seems primarily driven by industry and private car usage. In this regard, the government should redouble its efforts to develop policies to reduce industrial pollution and private car usage.

scholarly journals A Health Risk Assessment of Lead and Other Metals in Pharmaceutical Herbal Products and Dietary Supplements Containing Ginkgo biloba in the Mexico City Metropolitan Area

2021 ◽  
Vol 18 (16) ◽  
pp. 8285
Author(s):  
Patricia Rojas ◽  
Elizabeth Ruiz-Sánchez ◽  
Camilo Ríos ◽  
Ángel Ruiz-Chow ◽  
Aldo A. Reséndiz-Albor
Keyword(s):  
Health Risk ◽  
Dietary Supplements ◽  
Mexico City ◽  
Metropolitan Area ◽  
Ginkgo Biloba ◽  
Graphite Furnace ◽  
Human Health Risk ◽  
Daily Intake ◽  
Herbal Remedies ◽  
Herbal Products

The use of the medicinal plant Ginkgo biloba has increased worldwide. However, G. biloba is capable of assimilating both essential and toxic metals, and the ingestion of contaminated products can cause damage to health. The aim of this study was to investigate the safety of manganese (Mn), copper (Cu), lead (Pb), arsenic (As), and cadmium (Cd) in 26 items containing Ginkgo biloba (pharmaceutical herbal products, dietary supplements, and traditional herbal remedies) purchased in the metropolitan area of Mexico City. Metal analysis was performed using a graphite furnace atomic absorption spectrometer. All of the products were contaminated with Pb, 54% of them with As, and 81% with Cd. The lowest values of Pb, As, and Cd were detected in pharmaceutical herbal products > dietary supplements > traditional herbal remedies. The daily intake dose (DID) of pharmaceutical herbal products was within the established limits for the five metals. Dietary supplements and traditional herbal remedies exceeded the DID limits for Pb. The hazard quotients estimation and non-carcinogenic cumulative hazard estimation index for Mn, As, and Cd indicated no human health risk. Our results suggest that products containing G. biloba for sale in Mexico are not a health risk.

Fuel-based motor vehicle emission inventory for the metropolitan area of Mexico city

2005 ◽  
Vol 39 (5) ◽  
pp. 931-940 ◽  
Author(s):  
I. Schifter ◽  
L. Díaz ◽  
V. Múgica ◽  
E. López-Salinas
Keyword(s):  
Mexico City ◽  
Metropolitan Area ◽  
Emission Inventory ◽  
Motor Vehicle ◽  
Vehicle Emission

Indicators of environmental contamination by heavy metals in leaves of Taraxacum officinale in two zones of the metropolitan area of Mexico City

2017 ◽  
Vol 25 (5) ◽  
pp. 4739-4749 ◽  
Author(s):  
Sandra Gómez-Arroyo ◽  
Arisbel Barba-García ◽  
Francisco Arenas-Huertero ◽  
Josefina Cortés-Eslava ◽  
Michel Grutter de la Mora ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Mexico City ◽  
Metropolitan Area ◽  
Environmental Contamination ◽  
Taraxacum Officinale

Impact of sulfur-in-gasoline on motor vehicle emissions in the metropolitan area of Mexico City☆

Fuel ◽  
2003 ◽  
Vol 82 (13) ◽  
pp. 1605-1612 ◽  
Author(s):  
I Schifter ◽  
L Dı́az ◽  
M Vera ◽  
E Guzmán ◽  
E López-Salinas
Keyword(s):  
Mexico City ◽  
Metropolitan Area ◽  
Vehicle Emissions ◽  
Motor Vehicle ◽  
Motor Vehicle Emissions

scholarly journals In situ measurements of speciated atmospheric mercury and the identification of source regions in the Mexico City Metropolitan Area

2009 ◽  
Vol 9 (1) ◽  
pp. 207-220 ◽  
Author(s):  
A. P. Rutter ◽  
D. C. Snyder ◽  
E. A. Stone ◽  
J. J. Schauer ◽  
R. Gonzalez-Abraham ◽  
...  
Keyword(s):  
Point Source ◽  
Mexico City ◽  
Metropolitan Area ◽  
Atmospheric Mercury ◽  
Point Sources ◽  
Rural Site ◽  
Urban Site ◽  
Trajectory Data ◽  
Source Regions ◽  
Rural Sites

Abstract. In order to expand the currently limited understanding of atmospheric mercury source-receptor relationships in the Mexico City Metropolitan Area, real time measurements of atmospheric mercury were made at a downtown urban site, and a rural site on the outskirts of Mexico City, during March 2006. Numerous short-lived increases in particulate mercury (PHg) and reactive gaseous mercury (RGM) concentrations were observed at the urban site during the 17 day study, and less frequent increases in gaseous elemental mercury (GEM) concentrations were measured at both the urban and rural sites. The episodic increases observed were attributed to plume impacts from industrial point source emissions in and around Mexico City. Average concentrations and standard deviations measured during the study were as follows: i) urban site; PHg=187±300 pg m−3, RGM=62±64 pg m−3, GEM=7.2±4.8 ng m−3, and; ii) rural site; GEM=5.0±2.8 ng m−3. Several source regions of atmospheric mercury to the urban and rural sites were determined using Concentration Field Analysis, in which atmospheric mercury measurements were combined with back trajectory data to determine source regions. Only some source regions correlated to mercury emission sources listed in the Federal Pollutant Release and Transfer Register, leaving the rest unaccounted for. Contributions of anthropogenic mercury point sources in and around Mexico City to concentration averages measured at the urban site during the study were estimated to be: 93±3% of reactive mercury (PHg and RGM), and; 81±0.4% of GEM. Point source contributions to GEM measured at the rural site were 72±1%. GEM and reactive mercury (PHg+RGM) were not found to correlate with biomass burning at either of the measurement sites.

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